Abstract:The functions of moisturizing, sunscreen, anti-oxidation, inhibiting melanin and anti-aging of single component and complexes of Lonicera japonica polyphenols and ethanol extract of lingonberry were determined by weighing, dilution transmittance method, the scavenging capacities of [2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid)] (ABTS) and 2,2-diphenyl-1-picrylhydrazyl (DPPH), the tyrosinase inhibitory activity and elastase inhibitory activity, m(Lonicera japonica polyphenols): m(ethanol extract of lingonberry)=4:1, 2:1, 1:1, 1:2, 1:4. The Chou-Talalay combination index (CI) was used to analyze whether there were synergistic effects between the two. The results showed that m(Lonicera japonica polyphenols): m(ethanol extract of lingonberry)=1:2 and 1:4 showed synergistic effect on moisturizing; m(Lonicera japonica polyphenols): m(ethanol extract of lingonberry)=4:1, 2:1 and 1:1 exhibited synergistic effect on anti-UVB; all five complexes showed synergistic effects on scavenging ABTS free radicals, and the CI values were 0.79±0.036, 0.83±0.041, 0.85±0.026, 0.96±0.03, 0.98±0.027, respectively; all five complexes showed synergistic effects on scavenging DPPH free radicals, and the CI values were 0.69±0.046, 0.67±0.039, 0.78±0.031, 0.89±0.018, 0.97±0.029, respectively; m(Lonicera japonica polyphenols): m(ethanol extract of lingonberry)=4:1 showed antagonistic effect on inhibiting tyrosinase, while the other complexes exhibited synergistic effect, and the CI values were 0.71±0.054, 0.68±0.04, 0.76±0.033, 0.81±0.06, respectively; m(Lonicera japonica polyphenols): m(ethanol extract of lingonberry)=1:1, 1:2 and 1:4 exhibited synergistic effect on inhibiting elastase, and the CI values were 0.84±0.053, 0.88±0.042, 0.86±0.041, respectively. The results proved that the combination of Lonicera japonica polyphenols and ethanol extract of Lingonberry had synergistic effect on skin care. Combined with the performance on five skin care functions and synergistic effect, m(Lonicera japonica polyphenols): m(ethanol extract of lingonberry)=1:1 was the optimal complex for this study.

Abstract:A ultrafine carbon-supported Mn3O4 nanocatalyst by poly (vinyl alcohol)(PVA) mediated precipitation method using poly(ethylene glycol) (PVA) as a stabiliser was reported. The structure and morphology of the prepared nanomaterials were characterized by XRD, XPS, and TEM, and it was found that PVA could effectively reduce the aggregation and growth of Mn3O4 nanoparticles during the preparation process. The size of Mn3O4 nanoparticles prepared in the absence of PVA is 38.8 (±9.3) nm, while the size of Mn3O4 nanoparticles dispersed in the PVA molecular chains was 3.2 (±0.8) nm. After the Ar-protected carbonization treatment of the freeze-dried PVA/Mn3O4 composite, the Mn3O4 nanoparticles were uniformly immobilized on the C substrate with a particle size of 4.5 (±1.2) nm. The prepared Mn3O4-C catalysts have excellent ability for Fenton-like degradation of methylene blue (MB). Meanwhile, Mn3O4-C has better cycling stability compared to the Mn3O4 nanoparticles prepared in the absence of PVA.

Abstract:The color of leather and leather products reflects people"s aesthetic appeal, and is usually the primary evaluation feature in purchasing leather products such as shoes, leather clothes, bags and so on. Therefore, leather dyeing is one of the most important processes in the leather making process. In view of the uneven dying, low rubbing fastness and washing fastness exposed in the traditional dyeing, this article mainly introduced the methods to improve leather dyeing performance and clean leather dyeing technology. Firstly, common leather dyes and the principles of leather dyeing are briefly overviewed. Then two methods to improve the dyeing performance of leather, namely dyeing pretreatment and dyeing auxiliaries are discussed. The applications of ultrasonic technology, microwave technology, supercritical CO₂ technology, microcapsule technology, nano technology, electrochemical technology, plasma technology in leather dyeing are introduced. Finally, the development trend of leather dyeing is prospected.

Abstract:The proposal of carbon emission peak and carbon neutrality target makes the heat of hydrogen energy continue to rise. The breakthrough of hydrogen production technology is the key bridge for hydrogen energy to connect the energy consumption terminal. The hydrogen production by photocatalytic water splitting technology is an effective way to realize the low-carbon transformation of solar energy. In recent years, the hydrogen production by photocatalytic water splitting by metal-organic frameworks (MOFs) materials with high specific surface area and porosity, adjustable structure and abundant active sites is a research hotspot. The modification principles, technical difficulties and hydrogen production effects of semiconductor composite, metal ion doping, sensitizer modification and noble metal deposition methods in photocatalytic water splitting based on MOFs materials at home and abroad are reviewed and commented. The roles of above MOFs modification methods in inhibiting photogenerated electron hole pair recombination, optimizing the band gap of MOFs and increasing the active sites of MOFs are emphatically expounded and compared. The future research directions of MOFs photocatalytic water splitting for hydrogen production were proposed, which can deepen the development of new MOFs materials, optimize the sensitizer modification process and expand the advanced characterization methods.

Abstract:Ice-templating method is also known as directional freezing or freeze-casting. Its principle is to use the ice crystals formed in the freezing process as a template, sublimate the solvent through post decompression, and then densify it through post-treatment, and finally obtain the bionic structure. This method has the advantages of strong controllability of microstructure, wide application range of raw materials, and the ability to prepare large-scale materials, which is widely used in the preparation of directional control ceramics, polymers, metals, and carbon materials. Exploring the impact mechanisms of controlling functional nanomaterials to assemble composite materials by ice-templating method, and analyzing the interaction relationship of ice-templating method with other materials’ processing methodologies, is of great significance for improving material properties and developing new materials. This review describes fundamental principles, synthesis strategies, and pore regulation of the preparation of multi-scale complex bionic structural materials by ice-templating method. Focusing on the nucleation and growth of ice crystals, it summarizes the measures to control the pore structure of ice-templating method. In addition, it outlines the assisted construction of pore geometries by ice-templating method. Finally, the correlation between the microstructure and macromorphology of the composites is analyzed in-depth, highlighting the influence mechanism of different freezing processes on the pore structure, and prospects for future directions in this field.

Abstract:This paper firstly reviewed the research progress of the preparation methods of amphiphilic Janus nanosheets, including interface protection method, emulsion interface self-assembly sol-gel method, template-assisted sol-gel method, and block copolymer self-assembly method. Then, the colloidal properties of amphiphilic Janus nanosheets in aqueous solution and its interfacial properties in oil-water systems were systematically introduced. Finally, the application of amphiphilic Janus nanosheets was briefly introduced, and the future research directions for preparation and colloidal and interfacial properties of amphiphilic Janus nanosheets were looked.

Abstract:Bacterial infection has always been a difficult problem in food, medicine, biomedicine and so on. The discovery of antibiotics alleviated the demand for antimicrobial materials, but also led to the emergence of drug-resistant bacteria. Therefore, it is of great significance to develop natural antimicrobial agents and antibacterial materials with strong antibacterial activity and high biological safety. At present, antibacterial enzyme has a wide application prospect in medical machinery, food, medicine, cosmetics and so on, and it is of research significance to resist the formation of microorganisms and biofilms. In this review, we describe several common antimicrobial enzymes and antimicrobial enzyme systems, as well as the combination of antimicrobial enzymes and materials to obtain enzymatic bio-modified antibacterial materials. This new type of antibacterial material immobilized the bioactive antibacterial enzyme into the carrier material by the method of immobilized enzyme, which can improve the stability of antibacterial enzyme and expand its application range. Therefore, this study opens the door for the production and application of antimicrobial enzymes as new antimicrobial agents and green preservatives in food, medical and other fields.

Abstract:Calcium silicate bone cement materials can be used as hard tissue repair materials to fill and repair the defect of bone and teeth as for its good self-curing performance. However, due to low mechanical properties, long curing time and other shortcomings, its clinical application is limited. This paper mainly reviewed the preparation methods of calcium silicate powder and the mechanical strength, setting time, injectability, degradation and biocompatibility of calcium silicate bone cement. It is suggested that the key point of future research is to make use of the complementary relationship between the performance of bone cements of different systems to cross compound the calcium silicate cement with other systems. It is expected to obtain inorganic composite cement with excellent comprehensive properties.

Abstract:Due to its unique triplet state luminescence mechanism, room temperature phosphorescent materials have the characteristics of large Stokes shift and long excited state lifetime. However, traditional room temperature phosphorescent materials mostly contain heavy metal atoms, resulting in biological toxicity and environmental pollution problems, which limit their application. Pure organic room temperature phosphorescence materials, by contrast, low production cost, low toxicity and can be through molecular engineering of flexible design and structure of organic modified to make it more luminous characteristics, in the security encryption, organic electroluminescent, biological imaging, sensing detection has good application prospect, is inorganic phosphor material potential substitutes, Therefore, researchers have paid much attention to it. In this review, we summarized the research progress of organic room-temperature phosphorescence (RTP) in anti-counterfeiting encryption, organic electroluminescence, biological imaging and sensing detection in recent years, briefly summarizes the problems, and outlook the possible development direction in the future.

Abstract:Propionic acid and ethyl propionate are important chemical products and intermediates in organic synthesis. Due to the abundant ethanol resources, which could be obtained by the non-petroleum synthesis in China, the synthesis of propionate and ethyl propionate from ethanol has been extensively studied. However, the homogeneous carbonylation of ethanol encounters some problems, such as low yield, harsh reaction conditions and difficulty in separating the product from the catalyst. At present, the research on ethanol carbonylation mainly focuses on heterogeneous catalyst, includes noble metal catalyst and non-noble metal catalyst. In this paper, the research progress of the two types of catalysts is introduced in detail. The reaction mechanism of the two types of catalysts, the effects of promoters, supports and process parameters on the activity of two catalysts are emphatically described. The advantages and disadvantages of the different catalysts are pointed out and the application status of the catalysts is reviewed. Finally, the synthesis of propionic acid and ethyl propionate by the heterogeneous carbonylation of ethanol is prospected. Thus, this review could provide ideas for the design and development of catalysts with high activity and stability.

Abstract:Polyoxometalates (POMs) had a diverse structure and composition and unique performance characteristics. It was considered as a promising class of anionic materials in electrochemical biosensors and many other fields. POMs had defects such as poor electrical conductivity and low specific surface area. The preparation of POMs into polyoxometalate-based complexes with nanomaterials such as carbon-based materials, noble metals and metal organic frameworks could improve the defects of POMs and and enhance its electrocatalytic properties. Polyoxometalate-based complexes will also expand the range of applications in the field of electrochemical biosensors. This article reviewed the types and preparation methods of electrochemical biosensors with polyoxometalate-based complexes. As well as its research progress in the field of food analysis, and the future challenges and application prospects of this complexes were discussed.

Abstract:3D porous interfacial carbon materials have high-efficiency in water evaporation at the solution interface, which have important application prospects in the field of outdoor solar driven seawater desalination. Polyvinylalcohol (PVA) was used to modify polyurethane sponge with hydrophilicity, and multi-wall carbon nanotubes / polydimethylsiloxane (CNTs/PDMS) composite dispersion was sprayed on the front of the PVA modified sponge to obtain a 3D porous Janus solar driven interfacial evaporator with the front side super-hydrophobic and the backside hydrophilic. The wide band high solar absorptivity (> 95%) and the photothermal conversion effect of CNTs endow the sponge with interfacial water evaporation capability. The rough structure of the CNTs and the low surface energy property of the PDMS endow the photothermal absorption layer with superhydrophobicity. Thus, the modified polyurethane sponge can not only float on the water surface, but also have self-cleaning and salt blocking effects. Hydrophilicity of the PVA helps the modified polyurethane sponge form excellent water transport channels. The test results show that the evaporation rate of the modified polyurethane sponge with 3D porous structures as an interfacial evaporator can reach 1.80 kg m-2 h-1 under one solar intensity (1 kW m-2) for evaporation of simulated seawater (3.5 wt% salinity).

Abstract:Porous liquids (PLs) based on ZIF-8 with different particle sizes for CO2 capture were prepared through particle size control strategy. Combined with theoretical and experimental data of CO2 adsorption, it was confirmed that PLs had permanent pore structure. Viscosity experiments showed that different PLs have excellent fluidity. The three porous liquids of different sizes showed no aggregation and deposition after placement at room temperature for 60 d or centrifugation at 4500 r/min for 5 min, indicating that the PLs of different sizes have excellent stability. The influence of ZIF-8 sizes on the CO2 capture capacity, rate, CO2/N2 selectivity and cycling stability of PLs was studied, and the CO2 adsorption kinetics of PLs with different sizes were studied. The result showed that the CO2 adsorption by PLs based on ZIF-8 with different particle sizes includes physical adsorption and chemical adsorption. Among them, The ZIF-8-PLs(43) with the ZIF-8 size of 43 nm had the highest saturation CO2 adsorption capacity with 63.0 mg/g; ZIF-8-PLs(145) exhibited a faster CO2 adsorption rate with a kinetic constant of 1.91×10-3 g/(mg?min); ZIF-8-PLs(1400) had the highest CO2/N2 selectivity, which was 4.8 times higher than that of ZIF-8-PLs(43); All three PLs had excellent cycling stability after 5 cycles.

Abstract:In view of the distribution ban of fluorine-containing waterproofing agents in recent years, the development of environment-friendly fluorine-free waterproofing agents with excellent waterproof performance has become a key issue in the field of fabric finishing. The existing strategies based on the combination of long chain alkane and low surface energy silicone with nanoparticles are limited by the poor hydrophobicity and wear resistance, which seriously restrict the development and application of this kind of waterproofing agent. In this work, n-hydroxymethyl acrylamide (N-MAM) was introduced and combined with octadecene (ODE) and vinyl-terminated polydimethylsiloxane (Vi-PDMS) to achieve tough bonding between the low surface energy polymer network and the fabric surface via self-crosslinking and interface crosslinking of n-hydroxymethyl. The finished fabric is endowed with excellent mechanical and chemical stability, including waterproof, air permeability, abrasive resistance, acid and alkali resistance, washing resistance. The water contact angle on the surface of the treated fabric is up to 157° and the treated fabric remains good hydrophobicity after 1000 times of mechanical pressure friction, 10 minutes of strong acid and alkali immersion, and 5 cycles of washing. The flourine-free waterproofing agent has little effect on air permeability of the fabric, and the air permeability reaches 697 mm/s and 720 mm/s respectively before and after treatment, which solves the problem with traditional coated waterproof fabrics that are hydrophobic but not air permeable.

Abstract:Carbon black (CB) was functionalized by covalent bond using silane coupling agent KH550, and the carbon black before and after modification was investigated by FTIR, DLS and SEM. The results showed that the particle size of carbon black modified by KH550 was about 620nm and dispersed uniformly.CB/ WPU and KH550/CB/WPU conductive composites were prepared by solution blending and casting method. It was found that KH550/CB had better dispersibility in WPU matrix, which made the contact between conductive particles closer. When the addition amount was 3%, the conductivity was 1.79×10-3 S/m, which was 10 times higher than that of CB/WPU composites. The mechanical test showed that when the content was 2%, the tensile strength was 175% higher than that of CB/WPU composite.On this basis, the effects of different filling patterns and filling ratios on the electrical conductivity of KH550/CB/WPU composites were investigated by direct writing 3D printing. The results show that when the linear filling is selected and the filling rate is 80%, the conductivity is good, and the conductivity reaches 2.66×10-3 S/m.

Abstract:The influence of the microstructure of Mn3O4 on the preparation of mono-like lithium manganate by high temperature solid state reaction. The experimental results show that the precursors have a great influence on the structure and morphology of LiMn2O4. Mono-like lithium manganate, which has dense particle agglomeration, smooth surface, and small cell parameters, high density, and Li-ion molar concentration, is easily made by sphere-like Mn3O4 with small particle size and large specific surface area. The comprehensive electrochemical performanced and thermal stability of the mono-like lithium manganate is excellent and much higher than that of general lithium manganate materials, such as the first discharge specific capacity of 112.50 mAh/g and the coulomb efficiency at 0.2C of 96.5%; the discharge specific capacity is still as high as 102.11 mAh/g at 8C rate, as well as the capacity retention of 90.1% after 200 cycles at 1C. The excellent performance of single crystal lithium manganate is attributed to its more stable crystal structure, larger exposed surface, and higher li-ion molar concentration, but also exhibits higher charge-discharge reversibility, faster li-ion migration rate, lower electrode polarization and charge transfer impedance in electrochemical reactions.

Abstract:Preparation of Co and Mn catalysts suitable for the oxidation of paramenan by hydrothermal synthesis, the catalysts were characterized by N2 adsorption-desorption, SEM， XRD, FTIR, XPS, the catalytic effect of the catalysts in the oxidation of p-menthane was explored. The continuous production process of bubbling column reactor is used to carry out the oxidation reaction of p-menthane to generate p-menthane hydroperoxide; the reaction process is explored from the aspects of type of catalyst, reaction temperature, reaction time, and whether to add an initiator before the reaction. The optimum process conditions were as follows: adding PMHP initiator and Co catalyst before the reaction, the reaction temperature was 120°C, and the reaction time was 8h; According to GC-MS analysis, the content of p-menthane hydroperoxide was 30.28%, which reached an excellent level in the market.

Abstract:Abstract: Soy sauce ketone -2,3,4,6-tetra-O-acetyl-β-D-glucoside (Ⅲ) and soy sauce ketone-β-D-glucoside (Ⅳ) was obtained by a glycosylation reaction between 2, 3, 4, 6-tetra-O-acetyl-α-D-glucopyranosyl bromide (Ⅰ) and Soy sauce ketone (Ⅱ). The process of synthesizing glycoside Ⅲ was explored silver salt method and phase transfer catalysis method. The structures of the intermediates and products were confirmed by 1HNMR, 13CNMR, IR and HRMS. Glycoside Ⅳ was added into cigarettes to determine its transfer rate in cigarette mainstream smoke. The results show that both methods can obtain glycoside Ⅲ, and the phase transfer catalysis method is better than Koenigs-Knorr method. The reaction conditions of phase transfer catalysis were as follows: tetrabutylammonium bromide (TBAB) as catalyst, anhydrous potassium carbonate as acid binding agent, dichloromethane as solvent, n (acetyl bromide-α-D-glucose): n (soy sauce ketone) =1.2:1.0, reaction at room temperature for 8 hours, and the yield of glycoside Ⅲ was 44.5%. The acetyl group of glycoside Ⅲ was removed in the sodium methoxide/methanol system to obtain the target glycoside Ⅳ in 88.0% yield. Glucoside Ⅳwas added into cigarettes, the glucoside pyrolyzed into soy sauce ketone during smoking, and its transfer rate to mainstream cigarette smoke was 3.1%.

Abstract:Na3V2(PO4)3/C (NVP/C) in aqueous Zn-ion batteries cathode material was prepared by spray drying method and studied by changing the calcination temperature and calcination time. The effects of different calcination temperature and calcination time on the performance of NVP/C were investigated. The structure and morphology of NVP/C were characterized by XRD, SEM and BET, and the electrochemical performance of the sample was analyzed by cyclic voltammetry and charge and discharge test. The results show that all the samples obtained at different calcination temperature and calcination time are pure NVP/C, and do not change the crystal structure of NVP/C. Higher calcination temperatures or longer calcination times can lead to the particle size enlarges and the performance decays rapidly. The calcination temperature of 700 ℃ and calcination time of 8 h are optimal synthesis conditions of NVP/C materials. The samples synthesized in this condition possess a regular appearance, good crystallinity, low impedance and excellent ion diffusion, thus showing the best electrochemical performance. It exhibits the best discharge specific capacity of 122.4 mA·h/g at 0.1 A/g. Moreover, the capacity still reaches 103.9 mA·h/g after 200 cycles at 1.0 A/g.

Abstract:Chitosan-grafted citric acid carbon dots〔P(CS-g-CA)CDs〕were synthesized by hydrothermal reaction method using chitosan (CS), N-(2-hydroxyethyl)-ethylenediamine and anhydrous citric acid (CA) as the main raw materials.Then a series of corn starch/chitosan-based carbon dot composite light-converting films〔CST/P(CS-g-CA)CDs5,CST/P(CS-g-CA)CDs10,CST/P(CS-g-CA)CDs20〕with different P(CS-g-CA)CDs contents were prepared by flow-delaying method using corn starch (CST) as the base material.The optical properties, mechanical properties, hydrophilic properties and degradation properties of the composite films were investigated by fluorescence spectroscopy, a universal testing machine, contact Angle measuring instrument and soil degradation test. The results showed that with the increase of P(CS-g-CA)CDs, the tensile strength of the composite films increased first and then decreased, and the elongation at break showed an increasing trend as a whole; the contact angle of the composite films increased from 37.5° to 87° and the hydrophilic properties of the composite films decreased. Pure corn starch film without fluorescence response, CST/P(CS-g-CA)CDs20 can convert light in the UV region at 374 nm to blue fluorescence at 459 nm, and the composite film has blue light conversion performance. Difficult water-soluble carbon dots blending can delay the degradation of pure corn starch film, prolong the film service life, and achieve adjustable degradation rate.

Abstract:Octenyl succinic anhydride modified starch is an important esterifying agent, but its film-forming property needs to be improved. In this paper, taking the enzymatic hydrolysis of octenyl succinic anhydride modified waxy corn starch (OSS) as raw material, trisodium trimetaphosphate as modifier, the modified OSS films were prepared. The modified conditions were optimized by single-factor and response surface experiments using the tensile strength of films as the response value, and the structure of modified OSS films obtained under the optimal conditions was characterized. The results showed that the optimal process conditions were: 5.8 h for reaction time, 6.8 for reaction pH value, 18.0% for trisodium trimetaphosphate addition, and the tensile strength of modified OSS films obtained under these conditions was 2.19 MPa, 69.77% higher than the contrast. After modification, the cross section of OSS films were relatively homogeneous, and the onset phase transition temperature increased 14.6 ℃. The results of 31PNMR and FTIR showed that trisodium trimetaphosphate and OSS were associated to improve the performance of OSS films in the form of hydrogen bond. It is found that the film-forming property and the storage stability in high temperature of emulsive films could be effectively improved by modification of trisodium trimetaphosphate after emulsification of OSS with Vitamin E.

Abstract:Polylactic acid-graft-glycidyl methacrylate (PLA-g-GMA) was prepared by torque rheometer as the compatibilizer of PBAT and PLA blends. The grafting rate of PLA-g-GMA at different proportions of PLA and GMA were analyzed by FTIR and 1H-NMR. The effects of the compatibilizer on crystallization and microstructure of PBAT/PLA blends were studied by DSC and SEM. The results showed that GMA was successfully grafted onto PLA. When the amount of GMA was 20% of the total mass, the grafting rate of PLA-g-GMA reached 6.44%. The addition of compatibilizer improved the crystallization structure of PLA in the blends during cooling, and the cold crystallization peak disappeared when the addition amount was 6% of the total mass. When the mass fraction of the compatibilizer was 4%, the crystallization temperature of PBAT/PLA blends decreased from 75.4 ℃(without compatibilizer) to 68.0 ℃. The addition of PLA-g-GMA reduced the initial crystallization rate constant of the blends from 0.83(without compatibilizer) to 0.68(when the mass fraction of compatibilizer was 10%), inhibited PLA from forming crystal nucleus. But it increased the second stage crystallization rate constant from 1.28(without compatibilizer) to 1.38(when the mass fraction of compatibilizer was 2%), which promoted the growth of PBAT crystals; The compatibilizer reduced the degree of detachment between PLA and PBAT in the brittle fracture section. When the mass fraction of compatibilizer was 8%, the strength of the PBAT/PLA blend fiber increased from 0.25 cN/dtex to 0.33 cN/dtex.

Abstract:Using perfluoropolyether allyl ether and three kinds of double-terminated silohydropolysiloxane (PSi-H) as raw materials, three kinds of double-terminated silohydroperfluoropolyether-b-polysiloxane (PFPE-b-PSi-H) antifriction agents were prepared and then added into the formula of nitrile butadiene rubber (NBR) to vulcanize together to prepare fluorinated modified NBR. The structure of PFPE-b-PSi-H was characterized by IR and 1H NMR, and the wear, friction coefficient, tensile properties, hardness, dynamic mechanical and thermal properties of fluorine-modified NBR were tested. The results show that when PSi-H with 0.079% silicon hydrogen content is selected, the prepared PFPE-b-PSi-H makes the performance of NBR reach a better effect. When the addition amount is 2%, the Akron abrasion volume decreases from 0.25 cm-3 to 0.121 cm-3, the static friction coefficient decreases from 2.589 to 1.402, the dynamic friction coefficient decreases from 2.176 to 1.209, the tensile strength increases from 21.4 MPa to 24.2 MPa, and the Shore A hardness decreases from 81 to 79. The glass transition temperature is increased from 1.7℃ to 5.7℃, the loss factor is increased from 0.73 to 0.78, the Td10% is increased by 65℃, and the residual carbon rate is increased by 10%. It shows that the friction reducer can reduce the internal friction resistance and surface wear of NBR, and it is superior to Solway A10-P product (loss factor is 0.75).

Abstract:In order to meet the needs of high temperature reservoir fracturing, a hydrophobically associating polymer ( AAOS ) was synthesized by acrylamide ( AM ), acrylic acid ( AA ), octadecyl dimethyl allyl ammonium chloride ( ODAAC ) and octadecyl methacrylate ( SMA ), then, a new “self-crosslinking” high temperature resistant water-based liquid thickener ( FPM-1 ) was developed by using low molecular alcohol (ethylene glycol, glycerol, n-propanol), surfactant (coconut diethanol amide and lauryl sodium sulfate) and AAOS. SEM analysis showed that the mass fraction of 0.30 % FPM-1 aqueous solution could significantly increase the hydrophobic association crosslinking between AAOS polymer molecules and increase the hydrodynamic volume of the polymer. The solubility, apparent viscosity, salt tolerance and rheological properties of FPM-1 were tested. The results showed that FPM-1 solution was a high viscoelastic fluid with good sand suspension performance. The dissolution time of the mass fraction of 0.27 % AAOS was 7 min in water and the final viscosity was 90 mPa · s. The dissolution time of the mass fraction of 0.60 % FPM-1 with the same effective polymer content was only 3 min in water and the final viscosity was 165 mPa · s, indicating that the FPM-1 system could significantly improve the viscosity and dissolution rate of the polymer. After shearing at 90 °C, 170 s-1 for 1 h, the viscosity of the mass fraction of 0.27 % AAOS aqueous solution was 51 mPa · s, the viscosity of the mass fraction of 0.60 % FPM-1 aqueous solution was 77 mPa · s, and the viscosity of the mass fraction of 1.40 % FPM-1 aqueous solution was 53 mPa · s after shearing at 180 °C, 170 s-1 for 1 h. The viscosity retention rate of the mass fraction of 0.60 % FPM-1 in 5 × 104 mg / L salinity brine was 60 %. FPM-1 solution has excellent salt resistance, high temperature resistance and shear resistance. The surface/interfacial tension test showed that the FPM-1 system had low surface/interfacial tension, which was conducive to the flowback and recycling of the fracturing fluid breaking liquid.

Abstract:Series of aromatic formaldehydes (ketones) were synthesized via the oxidation of aryl methyl alcohols in the presence of the combination of 1-ethyl-3-methylimidazolium acetate ([EMIm][OAc]) and O2. Through screening the reaction conditions, the optimum conditions were obtained as follows: the moles ratio of aryl methyl alcohols and [EMIm][OAc] is 1/1, O2 pressure 0.2 MPa, reaction temperature 130 ℃, and reaction time 12 h. Under the optimal conditions, the gram-scale preparation of benzaldehyde was realized, and 20 aromatic ketones (formaldehydes) products with yields ranging from 65% to 96% were obtained. Moreover, according to related studies and in combination with the results of control experiments, the oxidation reaction mechanism was reasonably proposed: anion [OAc] of [EMIm][OAc] activated benzyl alcohol, O2 oxidation and dehydration to form benzaldehyde.