Abstract:The composite material of MoO3/Cd0.5Zn0.5S was synthesized by the one-pot hydrothermal method using MoO3, Cd0.5Zn0.5S and PVP. The structure, morphology and optical properties of the composite were characterized by XRD, XPS, SEM, UV-Vis DRS and PL. Under visible light irradiation, MoO3/Cd0.5Zn0.5S possessed photocatalytic degradation ability for methyl orange, rhodamineB, methylene blue, malachite green and acid fuchsin. Among them, the photocatalytic activity of methyl orange is the best. The experimental results showed that the degradation rate of methyl orange was 98% under the optimal conditions of 60 min, 0.67 g/L 10% Cd0.5Zn0.5S/MoO3 as well as visible light. For photocatalytic degradation methyl orange, reaction rate constant of 10%Cd0.5Zn0.5S/MoO3 was 169 times and 31 times that of MoO3 and Cd0.5Zn0.5S, respectively.

Abstract:Mesoporous silica SBA-15 was synthesized using fly ash as silicon source, PAA-SBA-15 adsorption material was prepared by surface modification of phosphoryl acetic acid (PAA), and XRD diffraction N2-adsorption desorption and infrared spectrometer characterization were performed on the adsorption material before and after the modification. The results showed that the highly ordered pores in the adsorbent material remained after modification. The PAA-SBA-15 adsorbent was used to adsorb rare earth ions, and it was found that the adsorption capacity for Eu3+, Gd3+, Tb3+, Nd3+, Sm3+ reached 18.6, 23.2, 21.9, 22.6, 20.2 mg/g, respectively. The influence of competing ions Ca2+, Mg2+, Al3+, Fe3+ on the adsorption of rare earths was studied, the results showed that Fe3+ reduced significantly the adsorption efficiency of rare earths. Adsorption kinetics and thermodynamics showed that the adsorption process fitted second level kinetics and Langmuir model, indicating chemical adsorption is dominated in the adsorption process.

Abstract:Novel catalyst benzothiazole ionic liquid supported on HZSM-5 ([HBth]HSO4/HZSM-5) was prepared via the excess solvent impregnation where benzothiazole ionic liquid ([HBth]HSO4) was used as the active component and hydrogen HZSM-5 molecular sieved as the carrier. The resulting catalyst was used as catalyst for synthesis of alkyl glycosides. Fourier transform infrared spectroscopy, N2 physical adsorption, field emission electron microscopy and X-ray diffraction results indicated that the benzothiazole ionic liquid was effectively loaded onto the surface and pores of the HZSM-5. When the amount of catalyst was 1.5 wt% of the total material mass, the reaction temperature was 105?C, and the molar ratio of glucose and octanol (n(glucose) : n(octanol)) was 6:1, the yield of octyl glycoside reached up to 148.8% (product mass/glucose mass ? 100%). The substrate expansion and catalyst stability results suggested that [HBth]HSO4/HZSM-5 had a good catalytic effect on alkyl glycosides, and the catalyst could be reused for four times without significant deactivation. After studying the catalytic synthesis mechanism and kinetics of alkyl glycosides, the kinetic equation is determined

Abstract:It is more and more important to find a novel green energy with the development of industry and consumption of fossil fuel. Hydrogen is a kind of clean and renewable fuel, and using photocatalyst to decompose water to produce hydrogen is an effective way to produce hydrogen. Graphite carbonitride photocatalyst (g-C3N4) as photocatalyst is low-cost and stable, also its size, thickness, structure and morphology is controllable. However, there are two main limitations of g-C3N4 in the field of photocatalysis: 1), the absorb light of g-C3N4 is limited by the wide band gap which caused the photoelectron-hole pairs is insufficient; 2), the recombination of electron and hole is high due to the transportation and separation of photoelectron-hole pair in g-C3N4 is limited. In this paper, the research progress of g-C3N4 in the field of photocatalytic hydrogen production is reviewed, the problem of g-C3N4 as photocatalyst is analyzed, also the improvement methods are summarized. Finally, the future development of g-C3N4 is prospected, the results can be used as a reference for the design and preparation of efficient and stable photocatalytic materials.

Abstract:Double-shell structure green electrophoretic particles (PIB/CT/S) were prepared through a sol-gel process in reverse microemulsion combined with surface solvent polymerization. The green nanoparticles (CT/S) were prepared by using silica spheres (S) as the matrix and CoTiO3 as the first coating. CT/S had a good spherical structure, with an average diameter of 191.2 nm and a particle density of 2.5644 g/cm3. In order to reduce the particle density, ionic liquid polymer poly [1-vinyl-3-dodecyl] imidazolium bromide (PIB) was used as the second coating to coat CT/S to obtain bivalve green electrophoretic particles (PIB/CT/S), 1.7905 g/cm3 and had excellent hydrophobicity and dispersion stability in the electrophoretic solution tetrachloroethylene (1. 623 g/cm3). The response time of the simple electrophoretic display was 165 ms which was significantly better than that of the green electrophoretic display reported at present.

Abstract:C—H activation reaction, as an important means of modern molecular splicing, has the advantages of high atom economy and simple synthesis route. Therefore, the derivatization of nonplanar aromatics through C—H activation has gradually become one of the hottest topics in molecular science. The C—H activation reactions for nonplanar aromatics, such as cyclophane, helicenes, corannulene, sumanene and fullerene in recent years are systematically summarized. And the research directions in the future is prospected in order to obtain more excellent nonplanar carbon-based materials.

Abstract:A high-efficiency carbon-based solid acid catalyst (S-SBC) is prepared by high-temperature calcination and p-aminobenzenesulfonic acid grafting using papermaking sludge with rich metal ions as raw materials. The composition, morphology, structure, acid load, specific pore size and specific surface area of the catalysts were investigated. The catalyst was used to catalyze the conversion of D-fructose to 5-hydroxymethylfurfural (HMF). The influence factors, such as reaction time, reaction temperature, catalyst mass fraction, solvent types and D-fructose concentration, were investigated and the poplar carbon catalyst (S-PBC) prepared by the same method was compared with S-SBC. The results show that the catalytic activity of S-SBC was better than that of S-PBC. S-SBC contains both Lewis acid sites formed by metal ions and Brönsted acid sites formed by -SO3H. The two acid sites have a synergistic effect in the process of catalyzing the dehydration of D-fructose to HMF. Using DMSO as the solvent, S-SBC catalyzed the reaction at 130 °C for 40 minutes, and the HMF yield was as high as 95.2%.After four consecutive uses, the catalytic activity did not decrease significantly.

Abstract:Amphiphobic surface has attracted wide attention due to its application in cleaning, antifouling and anticorrosion. However, because of mechanical friction and other effects, the micro-nanostructure and amphiphobic functional groups of the surface will be destroyed, which will affect the amphiphobicity of the surface. Therefore, improving the mechanical stability becomes the key problem in the practical application of amphiphobic surface. Recently, the research on the construction of mechanically stable amphiphobic functional layer with special morphology substrate combined with surface micro-nanostructure and lyophobic groups has attracted extensive attention. This paper makes a comprehensive review of the related research. The substrate with special morphology can achieve mechanical stability by providing protection for the attached smaller-scale nano rough surface and lyophobic groups through larger-scale regular concave convex structure. Electro/chemical etching, electrochemical deposition, laser processing, imprinting and template are the common preparation methods. More attentions should be paid to the establishment of theoretical model, the quantitative exploration of relative size and morphology of substrate and rough structure, the expansion of material research scope and the control of preparation cost.

Abstract:In order to discover and develop more efficient acaricides, two trifluoroethyl thioether (sulfoxide) derivatives TC-1 and TC-2 were synthesized by structural optimization with 2-(chloromethyl)-N-(2-fluoro-4-methyl-5-((2, 2, 2-trifluoroethyl)thio)phenyl)benzamide (compound Ⅶ) as lead compound. Their structures were confirmed by 1HNMR, 13CNMR and HRMS. Greenhouse acaricidal activity data showed that the mortality rates of TC-1 and TC-2 against Tetranychus cinnabarinus at 10 mg/L were 100% and 90.6%, respectively. Target compounds exhibited excellent acaricidal activity and can be used as lead compounds or candidate acaricides for further study and development.

Abstract:Three kinds of coconut oil acyl aromatic amino acid salts were prepared by amination of coconut oil with histidine sodium, phenylalanine sodium, and tyrosine sodium, which containing aromatic cyclic substituents, by a green synthesis method. The composition and chemical structures were confirmed by high-performance liquid chromatography- mass spectrum (HPLC/MS) and infrared (IR) spectra. The properties of the synthetic products were determined. The interfacial properties depend significantly on amino acid types. The critical micelle concentrations (CMC) of coconut acyl phenylalanine sodium and coconut acyl histidine sodium were 9.84×10-5 mol/L and 6.79×10-5 mol/L, respectively, which were far smaller than that of coconut acyl tyrosine sodium (1.54×10-2 mol/L). The sodium coconut acyl amino acid surfactants exhibited good emulsification and foaming stability. The maximum separation time of 10 mL aqueous phase from emulsion was 342 seconds. The foam height reached 157 mm, and the H5/H1 reached 0.898. Hard water resistance of the three amino acid surfactants was equal or better than that of soap. The detergency ability in distilled water of acyl amino acid surfactants was better than multiple traditional surfactants, like sodium linear alkylbenzene sulfonate (LAS) and sodium alpha-olefin sulfonate (AOS), and sodium soap of coconut oil.

Abstract:So far, TiO2 is a mature semiconductor photocatalytic material, but it is difficult to industrialize because of its poor dispersion, low quantum utilization, small specific surface area and difficult recovery. The introduction of porous metal organic framework MOFs can enhance the light absorption performance of TiO2/MOFs composites, improve the separation of electron hole pairs and improve the recovery. Based on the different addition order of precursors in the preparation of TiO2/MOFs, three preparation methods of TiO2/MOFs (Ship-in-a-bottle method, Bolt-around-ship method and One-pot method) and the photocatalytic mechanism and performance influencing factors of TiO2/MOFs were reviewed, and the binding mechanism of different MOFs with TiO2 was discussed. Finally, some suggestions on the problems of TiO2/MOFs are put forward.

Abstract:WO3 nano-films were synthesized on the conductive glass substrate by hydrothermal method. WO3/Bi2WO6 composite films were prepared by solvothermal method with different solvothermal reaction time (6 h, 8 h, 10 h) based on WO3 nano-films, and X-ray diffraction and scanning electron microscopy were used to characterize WO3/Bi2WO6 composite film samples. The WO3/Bi2WO6 composite film samples were tested for absorption spectroscopy, photocurrent, photoelectrocatalysis and alternating current impedance. The results show that the WO3/Bi2WO6 composite film samples have a wider spectral response range, higher photocurrent density and significantly improved photoelectrocatalysis efficiency than pure WO3 nano-films, and the WO3/Bi2WO6 composite film samples with a solvothermal reaction time of 8h have the highest photocurrent density and the best photoelectrocatalysis efficiency. The WO3/Bi2WO6 composite film effectively reduces the internal electronic impedance, increases the effective photoelectrochemical reaction sites, significantly improves the photoelectrochemical property, and can be well applied in the field of photoelectrocatalysis.

Abstract:Using poly(2,5-dihydroxy-1,4-phenylenepyridodiimidazole) (PIPD) as a matrix, PIPD nanofiber aerogels were prepared by peeling off the PIPD by the mixed acid, proton-consumption-induced gelation of PIPD nanofiber sol and freeze-drying, followed by high temperature treatment in an inert atmosphere. The morphology and structure of PIPD nanofiber aerogels were characterized. The results show that in the process of preparing PIPD nanofiber aerogels, the strong protic acid disrupts the crystal regions and orientation of the PIPD fibers, and the chemical structure of the PIPD does not change significantly. PIPD nanofiber aerogels have a honeycomb structure, low density (6.90~15.2 mg/cm3), high porosity (99.1~99.6%). When the PIPD fiber content (based on the total mass of MSA and TFA, the same below) is not higher than 1%, the PIPD nanofiber aerogels do not shrink significantly. High temperature treatment in an inert atmosphere makes PIPD nanofiber aerogels elastic. Horizontal and vertical combustion, the limiting oxygen index (LOI), and thermal conductivity tests show that PIPD nanofiber aerogels reach the non-flammable level (UL-94, V-0), LOI is as high as 49.2%, and the thermal conductivity is 0.052 W/(m·k) at 100 ℃. In addition, the introduction of Cu2+ coordination cross-linking network enhances the compressive stress of PIPD nanofiber aerogels, and the compressive stress of the enhanced aerogels are 15 times that of the original PIPD nanofiber aerogels.

Abstract:Pectin is a heteropolysaccharide consisted of α-1, 4-D-galactouronic acid with different neutral sugar residues which was linked by at least 22 glycosidic bonds. Compared with polysaccharides such as cellulose, sodium alginate and chitosan, the unique physiological activities of pectin including anti-tumor, regulating blood pressure, blood lipids and blood pressure provide the potential in drug sustained release carriers. However, the pectin generally present low molecular weight, and consist of abundant hydroxyl and carboxyl groups induced well water solubility of pectin, resulting in its poor release performance. Even so, coordination, nucleophilic addition and elimination reaction can occur on the sites of hydroxyl, carboxyl and amide functional group, which significantly influence its hydrophilic and hydrophobic properties, and molecular weight. Thus, the basic research of pectin-based drug delivery carrier is gradually expanded and show great potential. In this paper, the physicochemical properties of pectin and preparation of drug control-released carrier were reviewed and summarized. It can be divided into modification methods, pectin-based prodrug, hybrid materials, composite materials, and Pickering emulsion. Finally, the main problems and future in these areas are expected.

Abstract:N-p heterojunction Ag3PO4-LaFeO3/EB-40% photocatalyst was prepared by in-situ deposition-precipitation method using exfoliated bentonite (EB) as the support. The morphology, crystal structure, optical absorption properties, specific surface area, and photochemical properties of the composite were characterized by XRD, TEM, XPS, UV-Vis DRS, BET, EIS, and photocurrent spectra. It was found that, LaFeO3 and Ag3PO4 formed a compact n-p heterojunction and uniformly dispersed on the surface of EB, which significantly broadened the light response range of Ag3PO4 and effectively promoted the separation of photogenerated electron-hole pairs. The photocatalytic performance of the samples were evaluated by photodegradation of phenol under visible light. The results showed, the degradation rate constant of Ag3PO4-LaFeO3/EB-40% was 4.2 times than that of bare Ag3PO4, which could achieve a 97% removal rate of phenol under neutral condition and 81.62% removal rate after recycling 4 times.

Abstract:Different structures of siloxanes possess different properties. Therefore, diphenylsiliconediol (DPSD) and polydimethylsiloxane (PDMS and KF-2201) were selected to modify the representative anionic waterborne polyurethane through chemical bonding. The different structures of siloxanes which could optimized the structures of waterborne polyurethane were bonded to the macromolecular chains for improving water resistance and heat resistance, and the corresponding emulsion and films were prepared. By testing the water contact angle, water absorption, thermal weight loss, surface/fracture cross-sectional morphology, and other indicators of the waterborne polyurethane films, the differences in water resistance and heat resistance of the three modified films were explored. The research results showed that the surface, normal fracture cross-section, and liquid nitrogen brittle fracture cross-section of the modified films were smoother, and there was significant phase separation of soft and hard segments. XPS analysis showed that the Si-O segments of the films were easy to migrate to the surface, while the microphase separation of the soft and hard segments and the migration of the Si-O segments of the films could improve the water resistance and heat resistance of the films. Therefore, KF-2201 containing Si-O bond and hydrophobic benzene ring was more helpful to improve the water resistance and heat resistance of the films. The water absorption rates of the unmodified films, DPSD, PDMS, and KF-2201 modified films were 16.41%, 12.7%, 10.19%, 9.12%, and the water contact angles were 81.08?, 96.37?, 105.72?, 110.05?, when the thermal weight loss was 95%, the temperature was 367℃, 375℃, 394℃, 401℃.

Abstract:The TiO2 materials have excellent performances in the photocatalytic field, due to their high photocatalytic efficiency, good stability, not easy to produce secondary pollution, low cost, etc, and have been widely used in the fields of antibacterial and anticancer, preparation of hydrogen, wastewater treatment, solar cells, and self-contained solar cells, cleaning and anti-fogging, and so on. In this paper, the research progress of TiO2 photocatalytic materials in recent years are reviewed, and the photocatalytic mechanism over TiO2 catalysts and influencing factors of activity for TiO2 photocatalysts are also discussed. Then, the modification methods for TiO2 photocatalysts are systematically reviewed. The problems of TiO2 photocatalytic materials are also analyzed and the future development is prospected.

Abstract:The 2,5-bis(2,2,2-trifluoroethoxy)benzoyl chloride was synthesized from commercial 2,5-bis(2,2,2-trifluoroethoxy)benzoic acid through acylating chlorination with dichlorosulfoxide. Then piperidin-2-ylmethanamine was used for amination to obtain flecainide hydrochloride. Different alcohol solvents were selected for neutralization and salification. Flecainide was complexed with acetic acid to form target flecainide acetate. The ratio of raw materials, reaction time, and solvent on the yield were investigated. The optimized reaction conditions are as following: 1) n(2,5-bis(2,2,2-trifluoroethoxy)benzoic acid) ∶n(piperidin-2-ylmethanamine) =1∶1.8, 2) following converting the starting acid into acyl chloride, the acyl chloride was reacted with piperidine in THF for 2 hours to obtain flecainide hydrochloride, 3) with ethanol as the solvent, the quantity of flecainide was obtained by neutralization with NaOH in 0.5 h, 4) isopropyl alcohol was used as the solvent, refluxing with acetic acid for 0.5 h, leading to the target product. After two recrystallization process, the total yield of the 4-step reaction was 39.2%, and the purity of the final product was higher than 99.7% by HPLC analysis.

Abstract:In order to find a new type of metal-organic polymer-based anode material with excellent electrochemical performance, a new type of cobalt-based metal-organic polymer (Co-MOP) was synthesized by hydrothermal method with trimellitic acid as the organic ligand and cobalt nitrate hexahydrate. Co-MOP was calcined at 500 ℃, 600 ℃ and 700 ℃ under air atmosphere to obtain the corresponding Co-MOP-500, Co-MOP-600, and Co-MOP-700 derivative materials. Co-MOP derived materials have been studied as anode materials for lithium-ion batteries. The electrochemical test results show that Co-MOP-600 exhibits excellent electrochemical performance. At a current density of 100 mA/g, the first discharge specific capacity of the Co-MOP-600 electrode reaches 1818.5 mAh/g, and the specific capacity can be maintained at 1308.5 mAh/g after 100 cycles.

Abstract:Alkaline nano-silica sol was grafted and modified by KH560 and composite with styrene-acrylic emulsion to prepare film base material. Then, two kinds of color thermal insulation and energy saving coatings were prepared by adding rutile type titanium chromium yellow and corundum type chromium green color paste respectively. The energy saving performance and heat insulation mechanism of the composite coating were investigated under the conditions of different functional pigment types and dosage. The results show that the average particle size of silica sol is reduced from 987.3nm to 72.3nm, the absolute value of Zeta potential is increased by 29.7 eV, and the dispersion of silica sol in styrene-acrylic emulsion is improved. When the content of Ti-Cr yellow and Ti-Cr green were 20% and 10%, the thermal insulation performance of the two kinds of color coatings reached the best, the solar reflectance was 0.633 and 0.484, the infrared emissivity was 0.91 and 0.90, and the equilibrium temperature was 6.6℃ and 4.8℃ lower than that of the blank test plate, respectively. At the same time, the two kinds of color coatings had good mechanical properties and corrosion resistance.Key words: Mechanism of heat insulation ;Modified silica sol; Styrene-acrylic emulsion; Composite coating; Thermal insulation and energy saving coating; Reflective pigment

Abstract:Poly(4-acrylamido-2,2,6,6-tetramethylpiperidine-1-oxy)-graphene oxide (PTAm-GO) composite was prepared by atom transfer radical polymerization method material. The composite material was characterized by infrared, Raman, X-ray diffraction, thermogravimetric, electron paramagnetic resonance and other methods, and the active material was used as a positive electrode to be assembled into a button cell to measure its cyclic voltammogram, electrochemical impedance spectrum and Charge and discharge cycle capacity.The results show that the PTAm-GO electrode can undergo a reversible oxidation-reduction reaction, and has a lower electrochemical impedance than PTAm and a charge-discharge capacity about twice higher. After 300 charge-discharge cycles, the electrode specific capacity remains at 138 mAh/g, the capacity retention rate is 96.5%. This has important reference value for the development of organic batteries, especially for the research of oxynitride radical polymer electrode materials.

Abstract:A coaxial capillary array microreactor was designed and constructed to prepare fluorescent polymer dots (Pdots) by a nanoprecipitation method. Poly(9,9-dioctylfluorene-co-benzothiadiazole) (PFBT) was used as polymer, tetrahydrofuran (THF) as solvent, deionized water as anti-solvent and polystyrene-maleic anhydride copolymer (PSMA) as stabilizer in the experiments. The prepared Pdots were characterized by dynamic light scattering (DLS). The results showed that the accumulation and blockage of products were avoided at the tip of the injection nozzle in the microreactor due to the middle solvent stream which changed the mixing process between polymer solution and antisolvent. The microreactor kept on running well for a long time even at the high concentration of polymer solution of 500 mg/L. The size of the nanoparticles can be adjusted by varying the concentration of the polymer solution and the flow rates of the solution, solvent, and antisolvent. The diameters of the prepared nanoparticles were decreased down to 13 nm at the concentration of the PFBT solution of 50 mg/L and the flow ratio of deionized water to polymer solution of 750:1. The microreactor can be used to prepare continually polymer nanoparticles with controllable size.

Abstract:Nitrogen-doped Carbon Dots (NCDs) exhibiting excitation independent emission properties were synthesized by one-step hydrothermal method with sodium citrate as carbon source and ammonia as nitrogen source. NCDs prepared under optimal conditions were characterized by fluorescence spectrometer, TEM, AFM, XPS, and FTIR. The application of NCDs in Fe3+ detection and fluorescence anti-counterfeiting is also explored. The results showed that the optimal preparation conditions of NCDs were sodium citrate concentration of 0.1 mol/L, ammonia concentration of 1.8 mol/L, reaction temperature of 200 ℃, reaction time of 6 h, loading volume of 25 mL. The results demonstrated that the location of fluorescence emission peak of NCDs prepared under the optimal conditions is independent on the wavelength of excitation light, the best excitation wavelength is 343 nm and the best emission wavelength is 443 nm, while the fluorescence quantum yield is 54.9%.In terms of structure, NCDs are spherical with an average particle size of 4.96 nm. The carbon core is graphene-like structure and its surface contains —NH2, —OH and —COOH. The fluorescence of NCDs can be selectively quenched by Fe3+, and the degree of fluorescence quenching ΔF is linear related with the concentration of Fe3+ in the range of 0.1 and 87.5 μmol/L with the limit of detection of 50 nmol/L. In addition, fluorescent ink is prepared with the addition of NCDs, and the pattern printed by the inkjet printer is full as a whole, with clear edge details and strong identification.

Abstract:The reflection characteristics of abalone shell microstructure in the infrared band were studied. By scanning the cross-section of the abalone shell, the " stacked brick-mud" structure of the pearl layer was found to be regular. Using Fourier infrared spectrometer test, it was found that this kind of structure display a high reflectivity in the medium and far infrared region. Then the Comsol software was used to simulate the "brick-mud" structure to investigate the reflectivity from visible region to infrared region. The effect of structural parameters on the reflective efficiency was studied in details. It was found that, when 42 layers of brick mud structure, of which the paper layer was 1.17 m thick and refractive index was 2, the protein layer was 2 m thick, and the filled air refractive index was 1, the reflectivity in infrared region obtained was satisfied with infrared stealth. The frozen drying cycle is carried out by polyethylene alcohol with different mass fractions, and the simulated laminated structure is constructed. The results showed that the infrared reflectivity value of the 10wt% polyethylene alcohol was consistent with the results of the simulated structure.

Abstract:Amorphous TiO2 coated porous Si (P-Si@a-TiO2) anode material was synthesized by the alloying method and the sol-gel method, using micron-sized Al-Si alloy powder as raw material. The structure and morphology of the materials were characterized by XRD, XPS, SEM and TEM. The preparation mechanism of TiO2 layer and the effect of different coating thickness on the electrochemical properties of the composite were revealed. The results showed that the coralloid porous structure and the appropriate thickness of the coating layer can effectively buffer the volume expansion of the material, and was conducive to improving the stability of the electrode. When the coating thickness was 10 nm, the modification effect was the best. The electrode potential difference of the P-Si@a-TiO2 material was only 0.321 V, after 50 cycles at the current density of 1.0 A/g, the discharge specific capacity reached 1357.4 mA·h/g, showing superior electrochemical performance.

Abstract:This paper introduces the shielding principle of electromagnetic shielding materials, the types and properties of electromagnetic shielding loss materials, and summarizes the preparation methods and research progress of flexible based electromagnetic shielding materials.

Abstract:AgNPs@graphene composite material was prepared by a one-step method by using natural flake graphite, silver nitrate, sodium citrate, and N-methylpyrrolidone as raw materials. Then, thermoplastic polyurethane (TPU) is coated on the surface of the composite material to obtain a flexible stress sensor based on AgNPs@graphene. AgNPs@graphene composite material is characterized by XRD, TEM, and SEM. The electrical and mechanical properties of the flexible stress sensor are collected by a tensile tester and a data acquisition instrument. The result shows that the sensitivity of AgNPs@graphene flexible stress sensor can reach 299, which is much higher than that of pure graphene. At the same time, it has excellent vibration response and cycle stability, and its performance is still stable after 1000 cycles. It can effectively identify tensile strain and compressive strain, and track and monitor the movement of human body surface muscles in real time, which is a potential artificial intelligence skin.

Abstract:POSS/silicone modified polyacrylate fluorine-free waterproofing agent was synthesized by soap-free emulsion polymerization technology and applied to cotton fabric finishing. The effect of the ratio of soft and hard monomers on the emulsion, latex film and its application performance was investigated. The structure of polyacrylate and the size of latex particles were characterized by fourier transform infrared spectrum (FT-IR) and dynamic laser scatterometer (DLS). And the application properties and surface morphology of the finished fabric were characterized by servo material multifunctional high and low temperature control testing machine, softness meter, and scanning electron microscope (SEM). The results showed that when m(BA):m(MMA) was 6:4, the maximum conversion rate of monomer was 96.97%, the gel rate of emulsion was 0.14%, the minimum size of latex particles was 104.8 nm, as well as the latex film had the maximum water contact angle of 114.3? and excellent water resistance. The finished cotton fabric showed excellent mechanical properties, good softness, and its water contact angle was 161?. SEM results showed that functional POSS nanoparticles existed on the surface of cotton fiber. The fluorine-free waterproofing agent endows the cotton fabric with low surface energy and certain rough structure, so that the finished cotton fabric exhibits superhydrophobicity.