Abstract:MXenes is a two-dimensional nanomaterial with a unique layered structure, its prominent characteristics include mechanical stability, thermodynamic stability, high ratio surface area, biocompatibility, a large number of functional groups, easy functionalization, antibacterial properties, high conductivity , hydrophilicity and special optical properties and so on. Based on these features, MXenes and their composite materials have a wide concern in the environmental field. Through the literature research method, characteristics of MXenes and their composites are studied in environmental sectors include seawater desalination, remove heavy metals, remove radioactive elements, degrade organic pollutants, etc., especially in solving cleaning energy problems, it also shows huge potential.

Abstract:Chitosan is a potentially ideal material for the preparation of paper oil-repellent agent. However, the chitosan is expensive and hygroscopic. On that account, it is necessary to modify the chitosan based oil-repellent agent make it multifunctional as one agent, such as taking into account the functions of water-proof, antibacterial or water vapor barrier at the same time of oil resistance, so as to improve its industrial application value. According to the grease-proof mechanism based on chitosan, the factors influencing its oil repellency performances were summarized. Subsequently, the current research status of water-proof, antibacterial and water vapor barrier chitosan based oil-repellent agent was reviewed. Finally, the development direction of chitosan based oil-proof agents was also pointed out.

Abstract:Due to the changes in properties such as solid solution strengthening, the solid solution has a significant improvement in thermal stability and structural performance compared with a single component metal, so it has broad application prospects in catalysts. Aiming at the application of solid solution catalysts in the reaction of CO2 hydrogenation to methanol, this paper summarizes the properties and preparation methods of solid solutions, focusing on the reaction mechanism and measures to improve catalytic activity, and finds out the existing problems. The research direction of solid solution catalysts in the field of CO2 hydrogenation to methanol is prospected, and it is believed that solid solution catalysts are expected to provide a new paradigm for the research and development of catalysts in various reactions of CO2 resource utilization.

Abstract:Bacterial cellulose (BC) is a kind of structural carbohydrate with glucose as the basic skeleton produced in the process of microbial growth. It displays high purity, high degree of polymerization, high crystallinity, high water holding capacity, high tensile strength and good mechanical strength, showing great application potential in the field of functional materials. This paper reviewed the research status of BC synthetic strain screening in recent years; the progress of BC in air permeability, moisture absorption and perspiration, mechanical properties, dyeing and decolorization were analyzed; the research progress of BC based materials in functional modification such as antibacterial, anti ultraviolet, anti radiation, anti-static, water and oil repellent, conductivity and sensing was summarized. Finally, it was pointed out that BC large-scale and high-efficiency molding and molding technology, differentiated and high-function BC material preparation technology are the key research and development direction in the future.

Abstract:Conjugated microporous polymers (CMPs) are typical porous organic polymers with abundant micro/nanopores and structure tunability. They are widely used in various fields including gas adsorption, selective separation of pollutants and catalysis etc.. However, CMPs synthesized by conventional methods are normally insoluble and unfused with poor processability, which greatly limits their practical applications. In recent years, the construct of CMPs membrane materials with two-dimensional structure has attracted a lot of research attention. The CMPs membrane material not only retains the π-conjugated framework and nano-porous structure of CMPs materials, but possesses excellent machinability of two-dimensional materials. In this paper, the preparation methods of CMPs membrane materials, such as template method and interfacial polymerization, are reviewed. Meanwhile, the application status of CMPs membrane materials in nanofiltration, separation, antibacterial and other fields was also summarized, and the development direction of CMPs membrane material was prospected.

Abstract:Lactic acid is an important fine chemical, which has important applications in food, medicine, daily use chemicals and degradable materials. The use of agricultural wastes as raw materials to produce lactic acid can not only make full use of biomass resources, but also alleviate the contradiction between supply and demand of lactic acid, which is of great significance to promote carbon emission reduction and green development. In this paper, the latest research progress of lactic acid (ester) production from biomass by microbial fermentation and chemical catalysis was summarized, and factors limiting the production of lactic acid were analyzed. The advantages and disadvantages of the two methods were comprehensively compared. Finally, opportunities, challenges as well as potential research directions of lactic acid production from biomass were prospected.

Abstract:With the rapid development of wearable electronics, higher requirements are desired for the flexible energy storage devices. Fiber-shaped supercapacitors demonstrate great potential applications on wearable electronics, benefiting from their good flexibility, light weight, high power density, long cycling life and fast charge-discharge. Carbon nanotube fiber, graphene fiber, carbon fiber is considered as the promising electrodes for the fiber-shaped supercapacitors owing to their high electrical conductivities. In this article, we review the recent progress on fiber-shaped supercapacitors including the preparation of carbon nanotube-based, graphene fiber-based, carbon fiber-based supercapacitors, their electrochemical performances, and applications of fiber-shaped supercapacitors. Finally, we summarize the current challenges of the fiber-shaped supercapacitors, and predict and prospect further research trends of the fiber-shaped supercapacitors.

Abstract:Rare-earth upconversion nanoparticles (UCNPs), which can absorb low-energy near-infrared light and convert it into high-energy ultraviolet or visible light, and have excellent optics of low self-luminescence background, adjustable luminescence color, long fluorescence lifetime and good light stability. In addition, they also have the characteristics of high processability and convenient surface functionalization. Therefore, UCNPs have become the research frontier and hotspot of fluorescent anti-counterfeiting technology, and the application prospects are very wide. In this review, luminescent mechanisms of UCNPs, the advantages and disadvantages of a series of preparation methods are analyzed, as well as elaborate the relevant excellent research achievements in recent years in the field of fluorescent anti-counterfeiting such as labels, patterns, and encoding. Furthermore, the problems and challenges in the application of UCNPs in fluorescent anti-counterfeiting are discussed, and also propose the possible development directions in the future.

Abstract:γ-Valerolactone (GVL) is a promising biomass platform compound that can be obtained by catalytic hydrogenation of levulinic acid (LA). At present, researchers have developed a variety of catalysts for the selective hydrogenation of LA to GVL in different solvent systems. The most favorable routes for GVL synthesis are in aqueous and solvent-free systems, where good hydrothermal stability and acid resistance of the catalysts are crucial for the efficient hydrogenation of LA. In this review, we summarized the recent advances of the synthesis of GVL from LA in aqueous and solvent-free systems. In addition, this paper also analyzed the advantages and disadvantages of different catalytic systems, to provide some useful guideline for the development of an efficient and economic GVL synthesis system.

Abstract:The humidity sensor based on NiI2/TPU nanofibrous membranes was prepared by electrospinning. The surface morphology and microstructure of nanofiber film were characterized and analyzed, and the humidity sensitive characteristics based on color change and resistance capacitance response were studied. The results showed that the color of the composite fiber changed from tangerine to chartreuse with the increase of relative humidity (RH) from 0% to 97% due to the color change characteristics of NiI2. In addition, the humidity sensing performance of nanofibrous membranes was measured by fitting the nanofibrous membranes on PI based interdigital electrode, which showed fast response and recovery time (0.9s/9.9s), wide humidity monitoring range (0-97% RH), lower hysteresis (1.57% RH) and excellent stability (at least 30 days).

Abstract:A series of UV-cured cationic waterborne polyurethanes(UWPU) were prepared by biological resource castor oil. In order to further improve its antibacterial properties，the antibacterial UV-curable castor oil-based waterborne polyurethane（GWPU）was successfully prepared by introducing guanidine group in the reverse process of polyurethane prepolymer emulsification. The performance of the films were evaluated by a series of measurements，including water resistance test, inhibition zone test and antibacterial property test. The results showed that the water absorption rate of GWPU film relative to UWPU increased, but they remain below 10%; GWPU films were a contact antibacterial material, without antibacterial substance leaching; the antibacterial rate of GWPU films against S.aureus and E.coli was up to 99.9% when adding 1.2% aminoguanidine, and after antibacterial durability test can still maintain 99.9% antibacterial performance.

Abstract:Two salicylaldehyde Schiff base fluorescent compounds SSB1 and SSB2 were synthesized from salicylaldehyde, hexanediamine and o-phenylenediamine by the condensation reaction of aldehyde group and amino group. The compound SSB2 were made into printing pastes with different fluorescent dye concentrations for printing cotton fabrics. The surface morphology, chemical structure, chromatography and thermal stability of the obtained compounds were characterized. The fluorescent properties, color properties and color fastness of the fluorescent printed cotton fabric were investigated. The results showed that the yields of SSB1 and SSB were 88.8% and 86%, the relative maximum fluorescence intensities were 8305 and 5444, and the phase transition temperatures were 75 ℃ and 165 ℃, respectively; The soaping fastness of the obtained fluorescent cotton fabric can reach up to grade 4. When the dosage of SSB2 fluorescent dye is 10%, the best color depth and fluorescence intensity can be obtained respectively.

Abstract:The palygorskite /Al-doped CdS composites (PGS/CdS-Al) were prepared by solvothermal method. The structure, morphology and optical properties of the composite materials were characterized to us XRD, XPS, SEM, UV-Vis DRS and PL. Al element was successfully doped into the lattice of CdS and the crystal structure of CdS didn't destroy. But the band gap of CdS was widened. Under visible light illumination, PGS/CdS-Al had photocatalytic degradation activity for organic dyes, such as malachite green, methylene blue, methyl orange, crystal violet and rhodamine B. And the best photocatalytic degradation effect was rhodamine B. The photodegradation rate was 98.7% when 0.67 g/L 15% PGS/CdS-Al was added to Rhodamine B solution (30 mL, 20 mg/L) under the light illumination for 40 min. Holes were the main activity group in photocatalytic reaction. The photodegradation reaction followed the first order kinetics and the rate constant was 0.0065 min-1.

Abstract:Here a convenient method for preparation of low viscosity vinyl terminated fluorine and hydrogen polysiloxanes was explored. Ring-opening copolymerization of octmethylcyclotetrasiloxane (D4), 2,4,6,8-tetramethylcyclotetrasiloxane (D4H) and 1,3,5-tris(3,3,3-trifluoropropyl)methylcyclotrisiloxane (D3F) was firstly catalyzed with highly active strong acidic cation exchange resin (HND-580), and then end-capping was conducted with 1,1,3,3-Tetramethyl-1,3-divinyldisiloxane (D2Vi) to obtain low viscosity vinyl terminated fluorine and hydrogen polysiloxanes. The molecular structures of the copolymers were characterized by FT-IR and 1H-NMR spectroscopy. The thermal properties of the copolymers were measured by TGA. The influences of catalyst dosage, polymerization time, polymerization temperature and number of catalyst cycleson on the polymerization were studied. The results exhibited that when catalyst dosage was 5 wt% of the amount of reactant, polymerization temperature was 60℃ and its time was 6 h, the yield of the product obtained was 88.69% and the viscosity was 31 mPa?s. The contact Angle of the silicone oil can reach 115.2?.

Abstract:Spider silk protein (Ss) and Periplaneta Americana extract (PAE) were respectively loaded on the shell and core layers of nanofibers by coaxial electrospinning technique. With the increase of Ss, the diameter of fiber decreased from 350 nm to 280 nm, the diameter of core layer increased from 120 nm to 140 nm, and the thickness of shell layer was reduced from 100 nm to 70 nm. The nanofiber membrane had good performance in mechanical properties and hydrophilicity with the addition of Ss. The results showed that the tensile strength of the nanofiber membrane could reach 4.31 MPa, the swelling rate could reach 150%, the water vapor transmission rate could reach 1834 g/(m2?24h) and the water contact angle could be reduced to 32.7 ?. The influence of drug burst release could be significantly inhibited by core-shell structure, and finally long-term drug release was achieved. The drug release reached 77% within 7 days. Furthermore, nanofiber membrane could effectively inhibit the growth of bacteria and promote cell proliferation. Compared with that of unloaded Ss, cell proliferation of nanofiber membrane loaded with 20% Ss was increased by 25%, which indicates that Ss and PAE play a synergistic role in wound healing.

Abstract:Microemulsions were prepared using biosurfactant sophorolipid, and the simulation experiments of innocuous treatment and resource recovery of soil polluted by crude oil were carried out. The effects of the addition amount of sophorolipid and NaCl on the removal of crude oil were investigated by Fixing diesel oil addition amount, and the parameters of oily soil cleaning were optimized. Results showed that the optimal microemulsion formula was w(sophorolipid)=6%, w(NaCl)=1%, w(diesel)=13.36%. The optimized cleaning conditions were as follows, liquid solid ratio of 2:1, temperature of 35℃, stirring rate of 600 r/min, and cleaning time of 20 min. Under these conditions, the oil removal efficiency reached the highest value of 95.95%. Comparison between the original and the recovered crude oil and soil samples was done. It was found that the saturated alkanes content in the recovered oil became higher, while the content of aromatic, resin and asphaltene were lower than the original crude oil, and at the same time, the ash content and the density of the recovered oil were higher, while the viscosity was lower. The recovered oil showed certain economic value. The pH of the treated soil and total salinity decreased, while the organic matter content increased, and the soil was changed from heavy saline-alkali type to mildly saline-alkali type. The seed germination experiment proved that the soil toxicity was reduced to a certain extent after the treatment and was suitable for some plant growth.

Abstract:Sodium dodecylbenzene sulfonate (SDBS) was used as a surfactant to prepare a microemulsion cleaning agent, and a simulation experiment was performed to clean the oil on the metal surface. The effect of the addition of SDBS, Na2CO3, kerosene, and n-butanol on the cleaning efficiency of the microemulsion was investigated. In addition, different formulations were investigated from the temperature stability range, the cleaning efficiency with temperature and time changes, and finally an optimized microemulsion formulation for treating metal surface oil stains was screened: SDBS 10%, Na2CO3 1.4%, kerosene It is 12.8% and n-butanol is 6.4% (both are mass fractions). The types and amounts of corrosion inhibitors were investigated for their protective performance on carbon steel, brass, and aluminum. Finally, 0.06% sodium silicate was used as the microemulsion corrosion inhibitor. The cleaning agent has good cleaning and anti-rust effects, and has a certain degree of reusability. It is a low-foam alkaline cleaning agent.

Abstract:Use polyethylene glycol (PEG), Ymer N120, poly propylene glycol (PPG) and isophorone diisocyanate (IPDI) to synthesize polyurethane (PU) prepolymer with triethanolamine. Triethanolamine was used as a cross-linking agent. Then the prepolymer was immersed in the mixed solution of bletilla striata polysaccharide (BSP) and acrylamide (AM) to prepare BSP-loaded PU/PAM double network hydrogel through free radical polymerization. The structural characteristics, mechanical properties and biological properties of the hydrogel were characterized by FTIR, SEM, tensile compression and biological tests. The results showed that when the amount of triethanolamine added is 60% (the mole fraction of polyol), the dual network hydrogel had a high swelling rate (203%) while maintaining a certain tensile strength (1.9 MPa) and high compressive strength (22.7 MPa). The double-network hydrogel had antibacterial and antioxidant effects. The antibacterial bandwidths of Escherichia coli were 0.5 mm~4 mm. And the antibacterial bandwidths of Staphylococcus aureus were 0.5 mm~3.5 mm. The scavenging rate of hydroxyl radical was up to 28%. The rate of hemolysis was less than 5 %. And the rate of cell survival was up to 101.3%. Those can indicate that the double network hydrogel had good biocompatibility.

Abstract:The β-hydroxyethyl alkyl sulfide (RSCH2CH2OH) was synthesized by using polyethylene glycol (PEG) as phase transfer agent, potassium salt as catalyst, ethylene carbonate (EC) and mercaptan (RSH) as raw materials under atmospheric pressure and solvent-free. The transfer effect of PEG on the solid/liquid phases of different potassium salts in the β-hydroxyethylation of RSH and the effect of the amount of EC on the selectivity of RSCH2CH2OH have been investigated. The conversion of RSH, selectivity of RSCH2CH2OH and by-products were analyzed by GC and GC-MS. The results show that PEG alone has no catalytic activity. Compared with adding 0.5% (based on the molar amount of RSH, the same below) K2CO3 alone, the reaction rate and conversion rate of RSH have been significantly improved by adding 1.0%PEG and 0.5%K2CO3. The enhancement effect of PEG on the catalytic activity of K2CO3 increases with the increase of the length of PEG chain when the relative molecular weight of PEG is less than 1000. The selectivity of RSCH2CH2OH decreases as the ratio of the molar ratio of EC/RSH increases (≥1.02), the byproducts are vinyl alkyl sulfide and ethylene glycol. The addition of PEG can effectively break the phase interface limitation between the potassium salt catalyst and the liquid phase reactant, enhance the potassium salt catalytic activity. Besides, it can shorten the reaction time and increase the product yield under the solvent-free conditions.

Abstract:A variety of CeO2-Al2O3 composite oxides were prepared using a citric acid complexation method by varying the amount of CeO2 in the material from 5 to 30 wt.%. Using these as-prepared composite oxides as the supports, a series of Pd/CeO2-Al2O3 catalysts with 5 wt.% of Pd loading were prepared by a deposition-precipitation method. The physico-chemical properties of the catalysts were characterized by XRD, N2 adsorption-desorption, TEM and XPS technologies. Moreover, the performance of the catalysts was investigated for the one-pot reductive amination of levulinic acid with nitriles and H2 towards N-substituted 5-methyl-2-pyrrolidones. The results showed that the Pd/10%CeO2-Al2O3 catalyst exhibited the best performance, over which an 87.5% yield of N-benzyl-5-methyl-2-pyrrolidone was achieved through the reductive amination of levulinic acid with benzonitrile under mild reaction conditions (90?C, 1.5 MPa H2) for 5 h. Meanwhile, Pd/10%CeO2-Al2O3 was efficient for the reductive amination of levulinic acid/ester with various nitriles to give high yields of pyrrolidones (76.3%-87.4%). The catalyst was reused for 5 times, and its activity did not decrease significantly.

Abstract:Highly dispersed nano-zerovalent iron catalyst was prepared using hydrogen reduction method loaded on the activated carbon for NO reduction. The catalytic performance for catalytic reduction of NO was evaluated in a fixed-bed reactor. The catalysts were characterized by XRD, TEM, SEM, XPS and so on. The influence of H2 concentration and reduction temperature on the metal dispersion and NO removal performance of the catalyst were investigated, the regeneration of catalyst and the effect of CO on NO reduction were studied, and the CO-NO reaction mechanism was speculated. The results show that with the increase of H2 concentration, the activity of the catalyst was enhanced gradually. With the increase of preparation temperature, the activity of the catalyst was enhanced and then decreased. The particle size of Fe0/BAC-100H2-700 was 9 nm and Fe0 nanoparticles were evenly dispersed on the activated carbon. The NO removal performance of Fe0/BAC-100H2-700 catalyst could reach 100% at 325℃. In the process of NO removal, Fe0 was gradually oxidized to Fe3O4, leading to the deactivation of the catalyst. The deactivated catalyst can recover its activity after regeneration treatment. During the reaction, the addition of CO could reduce Fe3O4 to Fe0, increasing the life of catalyst and slow down the deactivation rate of catalyst effectively.

Abstract:The acylated tannin was prepared with tannin as the raw material, the reaction conditions were optimized, and the acylated tannin was used as a tanning agent for leather tanning, the performance of the tanned leather was measured and the tanning mechanism was inferred. The results showed that by dissolving 1 g of tannin in 6 g of trifluoroacetic acid, adding 1.5 g of hexamethylenetetramine, and reflux reaction for 1.5 h at 100 ℃, the acylated tannin with an aldehyde group content of 2.33 mmol/g was prepared. The shrinkage temperature of leather tanned with acylated tannin can reach to (85.3±2.5) ℃, the tear strength is (47.7±1.3) N/mm, the tensile strength is (10.2±1.1) Mpa, and the elongation at break is 97.9%±2.0%, which is better than unmodified tannin tanned leather. In addition, the tanned leather also has strong anti-ultraviolet capability. Acylated tannin retain their original active groups, which can form hydrogen bond cross-linking with leather collagen fiber molecules during the tanning process. The introduced aldehyde groups can react with the amino groups in the collagen fiber molecules to form stable chemical bonds. Under the combined influence of the two forces, the performance of the leather is significantly improved.

Abstract:Using waste cigarettes as raw materials, carbonizing them and then introducing amino functional groups to prepare ammoniated tobacco biocarbon adsorbent (ATC), to study the effects of pH, dosage, temperature, and adsorption time on the adsorption of U(VI) by ATC . The mechanism is analyzed by scanning electron microscopy (SEM), Fourier infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and other techniques. The results show that: when the initial concentration is 250mg/L, pH=6, dosage is 0.2 g/L, temperature is 40 ℃, adsorption time is 210 min, the maximum adsorption capacity of ATC for U(VI) is 495.04mg/g . The adsorption kinetics conforms to the quasi-second-order kinetic model; the Langmuir adsorption isotherm model can better describe the adsorption behavior of ATC on U(Ⅵ). U(Ⅵ) adsorption removal mechanism mainly includes electrostatic interaction, coordination and complexation with amino (-NH2), hydroxyl (-OH), carboxyl (-COOH), and the "π-π" interaction of Si-O-Si effect. Through 5 adsorption-desorption tests, it is found that the U(Ⅵ) removal rate is above 86.71%. This study shows that ammoniated tobacco leaf biochar has the potential to treat and repair the pollution of weakly acidic wastewater containing U(Ⅵ).

Abstract:In order to remove effectively the triazine herbicides, a kind of functional microflitration membrane is prepared.Chloromethylated polysulfone (CMPSF) microfiltration membrane was firstly modified into aminated membrane (AMPSF membrane). The –NH2/S2O82- redox initation system was constitued via the amino groups on AMPSF membrane and ammonium persulphate as initator in the solution, which initated monomer sodium p-styrenesulfonate (SSS) graft-polymerize on the AMPSF microfiltration membrane, resulting in the functional grafted-membrane PSF-g-PSSS. The structure of PSF-g-PSSS was measured by FT-IR and the morphology was observed by SEM. The isothermal adsorption experiments of PSF-g-PSSS membrane for three triazine herbicides, ametryn, prometryn and atrazine, were carried out in detail to estimate isothermal adsorption property and the mechanism of PSF-g-PSSS membrane for triazine herbicides. The rejection and removing performance of PSF-g-PSSS membrane for triazine herbicides from water were further studied by the permeation experiments. The results show that the electrostatic interaction between PSF-g-PSSS membrane and triazine herbicides leads to high adsorption capacity and rejection performance. As a filter with a membrane area of 78.5 cm2 is used, the rejection rate of PSF-g-PSSS membrane for ametryn solution with a concentration of 1 mg/L at 0.1 MPa can be closed to 100% until the volume of permeation solution reaches 2.5 L, displaying an excellent rejection and removing performance towards triazine herbicides.

Abstract:4-(4,4,5,5-tetramethyl-1,3-dioxide) imidazolyl-1-benzoic acid (NIT-Ph-p-BEN nitroxide radicals) was synthesized by a facile condensation reaction using 4-formylbenzoic acid and 2,3-bis(hydroxylamino)-2,3-dimethylbutane as precursors, and NaIO4 as oxidant. The product was characterized by FT-IR, UV, ERP and elemental analysis. The oxidative degradation activity of the NIT-Ph-p-BEN nitroxide radicals was investigated by catalytic degradation of organic dyes methyl orange, methyl blue and rhodamine B in wastewater. The results show that when the concentration of methyl orange, methyl blue and rhodamine B was 15 mg/L, and the concentration of NIT-Ph-p-BEN and H2O2 were 0.15 g/L and 30 mmol/L, respectively, NIT-Ph-p-BEN exhibited the best degradation activity for methyl orange. The degradation rate of methyl orange reached 94.26% only within 1 h. The catalytic mechanism demonstrated that NIT-Ph-p-BEN nitroxide radicals were effectively activated and regenerated by H2O2.

Abstract:In order to prepare a new low-cost and environmentally oil-absorbing material, we use bacterial cellulose (BC) as the matrix and dealkalized lignin (DL) as the hydrophobic modifier to prepare lignin-composite bacterial cellulose (BC-DL) materials by low-temperature infiltration method. The influence of process conditions such as raw material pretreatment, reaction time, temperature and material ratio on the hydrophobicity and oil absorption properties of BC-DL were explored. FTIR, XPS, SEM, BET, contact angle meter were used to characterize the chemical structure and microscopic morphology of materials. The specific surface area of BC modified by DL increased from 33.15 m2/g to 71.09 m2/g, and the water contact angle increased from 19.5° to 116.8°. The results of the oil absorption experiment showed that the saturated adsorption capacity (OCA) of BC-DL on peanut oil, diesel oil, and vacuum pump waste oil were 34.8 g/g, 33.7 g/g and 34.6 g/g, respectively; OCA still remained in 19.1 g/g, 18.3 g/g and 18.8 g/g after 8 cycles, which demonstrates that BC-DL has good adsorption performance and recyclability for the three oils.

Abstract:In this paper, covalently modified graphene (MG) was prepared using graphite and direct ash D as raw materials through diazonium chemistry process to improve its water dispersion properties, so as to suitable for textile industry. The structure, chemical compositions and heat stability of MG were characterized by Raman, Fourier infrared spectroscopy (FTIR), high-resolution X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA) etc. The results showed that the dye molecule has been successfully grafted on reduced graphene oxide and the grafting rate reached about 21%. UV-vis spectrophotometer was used to investigate the dispersibility of modified graphene in water and the results disclosed that the dispersibility and stability of MG in water were greatly improved relative to rGO, and the maximum concentration was 0.185mg/mL, and it still remained 0.092mg/mL after 7 days. The modified graphene has both properties of dyes and graphene.

Abstract:Waterborne polyurethane was prepared by terminal-hydroxypolybutadiene (HTPB) and poly (neopentyl glycol adipate) (PNA) as soft segments. The structure of as-prepared waterborne polyurethane was characterized by FTIR, XRD and SEM. The mechanical performance of the polyurethane was investigated by peel strength test on the biaxially oriented polypropylene (BOPP) film. The results show that the particle size of the emulsion gradually increased with the molar content of HTPB increased. The surface energy gradually decreased, then kept stable with the molar content of HTPB increased. The best comprehensive performance of the polyurethane was obtained when the molar content of HTPB was 30% of PNA. The average particle size of the polyurethane emulsion was 287.3 nm and the surface energy of the film was 31.77 mJ/m2. The tensile strength of the film was 14.2 MPa and the elongation at break was 977.72%. The peel strength of the polyurethane on the BOPP film was 4.4 N/25mm.