Vinyltriethoxysilane Research Articles

Synthesis and characterization of hydrogen selective silica membranes prepared by chemical vapor deposition of vinyltriethoxysilane

Hydrogen-selective silica membranes were prepared on a macroporous alumina support by chemical vapor deposition (CVD) of vinyltriethoxysilane (VTES) at 873 K at atmospheric pressure. The membrane had a high H2 permeance of 5.4 × 10−7molm−2s−1Pa−1 with H2 selectivity over CO2, N2, CO and CH4 of 95, 170, 170 and 480, respectively. In situ Fourier transform infrared (FTIR) measurements after CVD on an alumina disk at the same conditions as for the membrane preparation showed that the vinyl groups remained in the silica structure. The VTES-derived membrane had higher hydrothermal stability than a pure tetraethoxyorthosilicate (TEOS)-derived silica membrane, during exposure to 16mol% water vapor at 872 K for 72h. The temperature dependence of the permeance of various molecules (He, Ne, H2, CO2, N2, CO, CH4) before and after hydrothermal treatment gave information about the mechanism of permeance and the structure of the membrane. The membrane was composed of a contiguous silica network through which small species permeated by a solid-state mechanism and a small number of pores through which the large molecules diffused. The silica-based structure became more compact after hydrothermal treatment with decreasing permeance of small molecules (He, Ne, H2), while small pores were enlarged increasing permeance of large molecules (CO2, N2, CO, CH4). Calculation results for the small species based on a mechanism involving jumps of the permeating species between solubility sites showed lower activation energy and larger jump distances than those of a TEOS-derived silica membrane. The retention of the vinyl groups in the structure mostly associated with the defect pores resulted in interactions with CH4 and CO2, so that these species permeated by a surface diffusion mechanism.

Effect of gamma irradiation and fiber surface treatment on the properties of bagasse fiber-reinforced waste polypropylene composites

ABSTRACTBiocomposites of waste polypropylene (WPP) with bagasse fiber as reinforcing component can be readily prepared based on waste management application. Bagasse was subjected to chemical treatments using sodium hydroxide (NaOH) and vinyl triethoxysilane to modify the fiber properties. Scanning electron microscope and Fourier-transform infrared spectroscopy were used to elucidate fiber modification after treatments. Compounding of WPP at various ratios of bagasse was produced by melt mixing. Treated and untreated fiber composites were investigated under conditions of gamma irradiation at 20 kGy. In general behavior, at different fiber loadings, treated biocomposites have better properties than untreated one and fiber treated with silane is the best. Furthermore, treated biocomposites represented more biodegradability under soil than untreated one. The results of mechanical properties showed that the as-prepared fiber composites have superior irradiation-resistant properties.

Effects of pressure, contact time, permeance, and selectivity in membrane reactors: The case of the dehydrogenation of ethane

Abstract This paper provides some general conclusions about the effects of pressure, contact time, permeance, and selectivity in membrane reactors for the dehydrogenation of ethane. It is demonstrated that elevated pressure is desirable for the operation of membrane reactors even though the equilibrium may be unfavorable because of a net increase in moles (such as occurs in many hydrogen-producing reactions). This is because the increased reactant throughputs at higher pressures more than compensates for the decreased conversion, and because permeance is favored with higher pressure differences. It is also shown that a permeance above 10−7 mol m−2 s−1 Pa−1 is needed for satisfactory operation and that product selectivities above 100 do not substantially improve performance. Finally, it is shown that contact times above 10 s are important for operating membrane reactors. As a model A → B + C reaction, the dehydrogenation of ethane (C2H6 → C2H4 + H2) was studied over a 5 wt% Cr/ZSM-5 catalyst in a conventional packed-bed reactor (PBR) and in a membrane reactor (MR) fitted with hydrogen selective silica membranes at various feed flow rates, total pressures and temperatures. Two types of membranes were used. One was prepared by the chemical vapor deposition (CVD) of vinyltriethoxysilane (VTES) at 873 K and had a high H2 permeance of 4.0 × 10−7 mol m−2 s−1 Pa−1 with a H2/C2H6 selectivity of 240 at 823 K. The other was prepared by the CVD of a mixture of silica and zirconia precursors, and had a lower H2 permeance of 1.9 × 10−7 mol m−2 s−1 Pa−1 but a higher H2/C2H6 selectivity of 4300 at 823 K. At all reaction conditions the conversion of C2H6 and yields of C2H4 and H2 in the MR were higher than those in the PBR. The effect of pressure was studied and an important result was the finding that the productivity in H2 formation increased with increasing pressure even though the conversion of C2H6 decreased for thermodynamic reasons. A one-dimensional model was used to describe the MR, and it’s performance was evaluated by correlating the yield enhancement of C2H4 with the permeance of the membranes and also a parameter called an operability level coefficient (OLC), which is the ratio between the permeation rate and the formation rate of a H2 in the membrane reactor. Another notable finding was that a H2 permeance selectivity of 100 was sufficient to achieve good performance in the MR. Higher selectivities did not improve H2 yields significantly.

Inherently flame retardant vinyl bearing hyperbranched polysiloxanes having improved thermal stability-Ceramization and analysis of associated thermal properties

This study describes the synthesis and characterization of novel hyperbranched silicone polymers having high thermal stability and inherent flame retardancy achieved purely by molecular architecture, without the incorporation of any specific additive or filler. A series of hyper-branched terpolymers (MeDPhDViT) containing vinyl, phenyl and methyl moieties were synthesized by the acid catalysed copolymerization of vinyltriethoxysilane (VTES), diphenyldimethoxysilane (DPDMS) and dimethyldiethoxysilane (DMDES). Curing of these polymers is effected through condensation of the hydroxyl groups triggered by dibutyltindiluarate (DBTDL) catalyst. Glass to rubber transition temperature (Tg)of the cured polymers vary systematically from −110 °C to +50 °C with the increase in the content of vinyl T (ViT) units in the polymer backbone. The terpolymer with maximum ViT-unit content shows an onset of thermal decomposition above 540 °C and leaves 86% char residue at 900 °C, attributed to the retardation of depolymerisation by ViT unit. The limiting oxygen index (LOI) of the terpolymers increases from 26 to 37% with increase in ViT unit content alone, from 13.4 to 53.3 mol% and the terpolymer with 53.3 mol % ViT unit rates as V-0, the best in the UL-94 flame test. The ceramic residue from the cured elastomer comprises of free carbon and silica/Si-O-C ceramics. A probable mechanism has been proposed for the rearrangement of vinyl groups to carbonaceous ceramics under high temperature environment. The vinyl groups promote the formation of a carbonized, in particular graphitized, layer and SiOC phases during pyrolysis, as evidenced by TG-MS, pyrolysis GC-MS, Raman spectroscopy and FESEM analysis. Comparative study with a non-phenylated silicone elastomer confirms the mechanism of formation of carbon rich residue by the thermal rearrangement of vinyl groups.

Designing superhydrophobic surface based on fluoropolymer–silica nanocomposite via RAFT‐mediated polymerization‐induced self‐assembly

ABSTRACTSuperhydrophobic surfaces (SHS) find versatile applications as coatings due to their very high water‐repellency, self‐cleaning, and anti‐icing properties. This investigation describes the preparation of a SHS from surfactant‐free hybrid fluoropolymer latex. In this case, reversible addition‐fragmentation chain transfer (RAFT) polymerization was adopted to prepare a copolymer of 4‐vinyl pyridine (4VP) and vinyl triethoxysilane (VTES), where the pyridine units were quaternized to make the copolymer soluble in water. The copolymer was further used as a macro‐RAFT agent to polymerize 2,2,2‐trifluoroethyl methacrylate (TFEMA) in a surfactant‐free emulsion via polymerization‐induced self‐assembly (PISA). The macro‐RAFT agent contained a small amount of VTES as co‐monomer which was utilized to graft silica nanoparticles (SNPs) onto the P(TFEMA) spheres. The film prepared using the nanocomposite latex exhibited a nano‐structured surface as observed by SEM and AFM analyses. Surface modification of the film with fluorinated trichlorosilane produced an SHS with a water contact angle (WCA) of 151.5°. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 266–275

Biodegradation of gamma irradiated poly-3-hydroxybutyrate/sepiolite nanocomposites

The influence of different doses of gamma irradiation on the physical and biodegradation properties of poly-3-hydroxybutyrate/sepiolite (PHB/SP) nanocomposites has been investigated. The sepiolite was modified with vinyltriethoxy silane (VTES) to enhance its compatibility with PHB. The scanning electron micrographs of nanocomposite films showed a good network formation. The infrared spectra of irradiated nanocomposite films indicated a significant decrease in the intensities of peaks observed at 2933 and 2859 cm−1 (CH stretching vibrations of the vinyl moieties) with an increase in the absorption dose. Thermal stability of nanocomposite films was increased as compared to the PHB. The unirradiated and irradiated nanocomposite films were subjected to in-vitro and soil burial biodegradation studies. Scanning electron micrographs showed the formation of biofilm, agglomerates and pits on the surfaces of nanocomposite films after soil burial. The biodegradation process of nanocomposite films was further confirmed by a sharp reduction in the intensities of IR peaks found at 3658-3045 cm−1 (OH stretching), 1720 cm−1 (the carbonyl ester stretching), 1456 cm−1 (anti-symmetric bending vibration of CH bonds) and 1275 cm−1 (C-O-C stretching). These results suggest the possible application of the PHB/SP nanocomposite film as a biodegradable food packaging material.

Water repellency and warmth retention finishes for polyester fabrics based on hybrid materials comprising zirconia, silica, and thiazole dyes prepared via sol-gel synthesis

A series of hybrid materials composed of zirconia, silica, and thiazole dyes were synthesized from zirconium npropoxide (ZNP) and tetraethoxysilane (TEOS) using heteroaryl 2-amino-thiazole azo dyes, and prepared via the sol-gel process. The heterocyclic 2-amino-thiazole azo dyes underwent a hydrolysis-condensation reaction with an appropriate proportion of ZNP under a catalyst, using a constant ratio of vinyltriethoxysilane (VTES) and TEOS. The structures of these hybrid materials composed of zirconia/silica/thiazole dyes were characterized using Fourier transform infrared (FT-IR) analysis. The surface morphologies of the polyethylene terephthalate (PET) fabrics were evaluated using scanning electron microscopy (SEM). The SEM images demonstrated the uniform dyeing of the PET fabrics, which confirmed the reaction of the hybrid materials with the PET fabrics. The water contact angle, washing fastness, color uniformity, and warmth retention of the PET fabrics dyed with the hybrid materials composed of the zirconia/silica/thiazole dyes were evaluated. The evaluation results indicated that these fabrics offered enhanced warmth retention properties and good water repellency.

Surface modification of ultrahigh molecular weight polyethylene by plasma-induced in-situ grafting with vinyl triethoxysilane.

Ultrahigh molecular weight polyethylene (UHMWPE) is an excellent material with high performance, but it is very difficult to covalently introduce functional groups on its surface owing to its inherently inert structure, which constrains its further application. In this study, vinyl triethoxysilane (VTEOS) containing hydrolysable alkoxyl groups was in situ grafted on UHMWPE by air plasma treatment. The plasma treatment conditions for VTEOS grafting were optimized. The structure of the modified UHMWPE was characterized with FTIR and XPS. The relatively high VTEOS content was obtained when the treating conditions were about 20 W, 125 Pa for 10 min. And FTIR results showed that the grafted structure on the surface was stable for long time duration in the ambient environment. After the treatment, the roughness of the surface increased and the water contact angle of the modified sample dropped to 47.5° from 92.8° of the unmodified one. TGA and XRD results indicated that plasma treatment would not change the bulk structure of UHMWPE greatly. Cell culture experiments showed that fibroblasts on the modified samples had notably high viability and proliferation rate with good adhesion shape. Hence, it might be an effective method to improve the surface properties of UHMWPE for biomedical applications by plasma-induced in-situ grafting with VTEOS. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 321-332, 2018.

Improving mechanical, thermal, and electrical properties of polyimide by incorporating vinyltriethoxysilane functionalized graphene oxide

Functionalized graphene oxide (FGO) nanosheets were produced by reacting graphene oxide with vinyltriethoxysilane (VTES). The vinyltriethoxysilane graphene oxide and polyimide (VGO/PI) composites were prepared by solution blending method. In comparison with the pristine polyimide (PI) and graphene oxide/polyimide (GO/PI) composite, VGO showed better mechanical, electrical and thermal properties. The tensile strength of VGO/PI composite with 0.8 wt% VGO loading was up to 148 MPa, i.e., 105% higher than that of pure PI. The respective electrical and thermal conductivity values of composite were found 2.15 × 10−3 S/m and 0.89 W/mK as compared to 1.21 × 10−12 S/m and 0.13 W/mK for the pure PI. The thermal stability of composite was found to improve with the addition of VGO. Significant improvement in the properties has been explained in terms of homogeneous dispersion of VGO in the matrix and its strong interfacial adhesion with polymer due to surface modification of GO. POLYM. COMPOS., 39:E1635–E1642, 2018. © 2017 Society of Plastics Engineers

Triton X-100 stabilized Pd nanoparticles and their catalytic application in one-pot sequential Heck and Hiyama coupling in water

In situ-generated palladium nanoparticles (Pd NPs) using Triton X-100 non-ionic surfactant-catalyzed one-pot sequential Hiyama and Heck coupling reactions in water under aerobic conditions has been demonstrated. The reaction was highly efficient for the synthesis of symmetrical stillbenes utilizing arenediazonium salts and vinyl triethoxy silane. The in situ-generated Pd NPs were characterized by transmission electron microscopy analysis and had a size below 20 nm. The aqueous system containing the surfactant along with the Pd NPs was recycled five times, without significant loss of catalytic activity.

Self-crosslinking coatings of fluorinated polysiloxanes with enhanced icephobicity

Fluorinated polysiloxanes with different grafting densities of fluorinated groups were synthesized via hydrosilylation reaction between polymethylhydrosiloxane and tridecafluorooctyl methacrylate (13FMA). By further introduction of vinyltriethoxysilane (VTES), the produced polymers underwent self-crosslinking to generate icephobic coatings. Characterizations of surface chemical composition and morphology of the fluorinated polysiloxanes coatings suggested that the fluorine content and the surface roughness of the coating surface increased with the amount of 13FMA. When the fluorinated polysiloxanes grafted a suitable amount of 13FMA and VTES, supercooled water droplets could easily slip away from the tilted coating surface at −15°C, ascribing to its high receding contact angle, and the ice shear strength could reduce to 83±2kPa. Results of this study further demonstrated the importance of the synergistic effect of silicon and fluorine for contribution to the enhanced icephobicity, and the self-crosslinking fluorinated polysiloxane coatings could find more feasible applications for anti-icing.

Thermo-responsive hydrogels with tunable transition temperature crosslinked by multifunctional graphene oxide nanosheets

Hydrogels consisting of reactive monomers can respond to external stimuli, which is promising for many applications such as sensors, soft robotics, and actuators, etc. However, most of responsive hydrogels are hard to fabricate into smart devices due to their poor mechanical properties. In this paper, vinyl-modified graphene oxide (GO-VTES) nanosheets were facilely prepared through the coupling reaction between hydroxyl or carboxylic acid groups from graphene oxide (GO) and hydroxyl groups from hydrolyzed vinyltriethoxysilane (VTES). By using the multifunctional GO-VTES nanosheets as crosslinkers, N-isopropylacrylamide (NIPAM) and acrylamide (AAm) were copolymerized to generate a series of tough and thermo-responsive composite hydrogels. The structures and morphologies of GO-VTES were investigated by FTIR, Raman, XPS, XRD, AFM and TEM. The obtained thermo-responsive composite hydrogels exhibit enhanced mechanical properties, which can be tuned by varying the content of GO-VTES and AAm. Moreover, these hydrogels were thermo-responsive with the LCST tunable by manipulating the contents of GO-VTES and/or AAm in the hydrogels. This strategy to prepare responsive composite hydrogels with enhanced mechanical properties has attractive applications for fabricating smart soft actuators.

PAMAM grafted α-Fe 2 O 3 nanofiber: Preparation and dye removal ability from binary system

Abstract In this paper, polyamidoamine (PAMAM) grafted α-Fe 2 O 3 nanofiber as a new adsorbent was prepared by a three-step method. (1): preparation of α-Fe 2 O 3 nanofiber by electrospinning technique, (2): incorporation of vinyl group on the nanofiber surface by vinyltriethoxysilane (VTES) and (3): grafting of PAMAM dendrimer onto the nanofiber surface. For the first time, the possibility of reaction between the vinyl group of VTES and the amine group of PAMAM was evaluated and the optimum condition was reported. Characterization by Fourier transform infrared spectroscopy (FTIR) showed that the PAMAM molecules were covalently grafted to the surface through the formation of C N group. The diameter of nanofibers was increased after the grafting process, confirming the deposition of a layer containing silica and PAMAM molecules on the surface. Decreasing in the total surface area values of nanofibers after the grafting process was detected by Brunauer–Emmett–Teller (BET) analysis. Moreover, dye removal ability of prepared nanofibers in single and binary systems were investigated. It was found that the number of functional group and size of dye molecule play important roles in selective adsorption in binary system. Adsorption of dyes in single and binary systems followed the Langmuir isotherm and pseudo-second order kinetics confirming monolayer and chemical adsorption, respectively. The maximum adsorption capacity of PAMAM grafted nanofiber was 1428.57 and 1250 mg/g for Direct Red 80 and Acid Red 18 at pH 3, respectively. It was concluded that the prepared nanofiber with a relatively large adsorption capacity can be a suitable alternative for elimination of dyes from aqueous media.

Development of amidoxime functionalized silica by radiation‐induced grafting

ABSTRACTA novel amidoxime‐based silica adsorbent was prepared by using radiation‐induced grafting technique. Grafting of acrylonitrile (AN) on silanized silica that was silanized by vinyltriethoxysilane (VTES) was carried out in solvent‐free system. The grafting of AN was increased with increasing the absorbed dose and monomer concentration in the mixture. Grafting of 748% of AN was achieved at 20 kGy dose. The nitrile groups of acrylonitrile grafted silica (AN‐g‐S) were chemically converted into amidoxime groups. The structure of AN‐g‐S and its corresponding products was investigated by FTIR, SEM, TGA, BET, and XRD analysis. FTIR and EDX analysis confirmed the grafting of AN onto silica surface. The changed morphology of SEM images shows the presence polyacrylonitrile layers on silica particles. The adsorption application of amidoxime‐grafted silica (AO‐g‐S) was studied against Cu2+. Its adsorption capacity is strongly depended on the pH of the solution and 172 (mg/g) of Cu2+ uptake was obtained at pH 5.0. The developed adsorbent has potential application to remove heavy metal ions from aqueous solutions. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45437.

One-Step Synthesis of Hydrophobic Multicompartment Organosilica Microspheres with Highly Interconnected Macro-mesopores for the Stabilization of Liquid Marbles with Excellent Catalysis.

The combination of an emulsion template with polymerization is a very convenient approach to the one-step realization of both simple control porous structures via a change in emulsion formulation and easy functionalization via the concomitant choice of an on-demand monomer. A major challenge of this approach is the inherent instability of the oil/water interface in emulsions, especially the occurrence of chemical reactions in oil or aqueous phases. This study reports the pioneering preparation of highly interconnected macro-mesopores and multicompartment (HIMC) vinyl organosilica microspheres with hydrophobicity by the one-step formation of W/O/W emulsions acting as a template. The emulsion system consists of acidified deionized water, a stabilizer, and vinyltriethoxysilane (VTEO) in which VTEO can be used to produce an organosilica skeleton of the resultant microsphere by a sol-gel process. The study demonstrated that the marvelous stability of W/O/W emulsions aids the formation of multicompartment organosilica microspheres with highly interconnected macro-mesopores by emulsion droplets rather than single-compartment (SC) microspheres. Meanwhile, the internal porous structure and surface morphology of as-prepared organosilica microspheres could be largely tuned by a simple variation of the pH value, the volume fraction of the water phase, and the stabilizer concentration in the initiating multiemulsions. Benefiting from such a well-orchestrated structure and the existence of numerous vinyl groups on the surface, HIMC organosilica microspheres exhibit very high hydrophobicity (with a water contact angle larger than 160°), which allows them to stabilize liquid marbles with excellent stability and high mechanical robustness. Because of its strong catalyst, Ag nanoparticles within HIMC organosilica microspheres enable Ag/HIMC-vinyl organosilica microsphere-based liquid marbles to be an efficient catalytic microreactor, realizing the complete degradation of MB to leuco methylene blue by NaBH4 in 10 min. The result of this work could provide some guidance for the easy, low-cost, benign preparation of HIMC microspheres having the potential to be excellent supporter of metal nanoparticles or other functionalized compounds for applications in sensing, optoelectronics, and catalysis.

Mechanical Force Sensitive Acrylic Latex Coating.

We prepared force sensitive acrylic latex coatings by covalently incorporating spiropyran mechanophore. The acrylic latexes were obtained through emulsion copolymerization of butyl acrylate (BA), methyl methacrylate (MMA) with vinyltriethoxysilane (VTES) as interparticle cross-linker, and (1'-(2-(methacryloyloxy)ethyl)-3',3'-dimethylspiro[chromene-2,2'-indolin]-6-yl)methyl methacrylate) (SP) as intraparticle cross-linker. The latexes of P(BA-co-MMA-co-SP-co-VTES) were subsequently cast onto Teflon-coated surface to form latex coatings. The condensation of hydrolyzed VTES provided interparticle cross-linking and improved mechanical properties of the formed thin films. Intraparticle cross-linker SP endowed the coatings with mechanoreponsiveness. The mechanoactivation of SP-containing latex films was demonstrated. Increasing the content of intra-cross-linker SP resulted in higher stress sensitivity and lower critical stress required for mechanoactivation. Increasing the content of interparticle cross-linker VTES resulted in higher critical stress for SP mechanoactivation but had little effect on the stress sensitivity. Tg and operation temperature also showed significant effect on mechanoactivation. Slower strain rate allowed for higher SP-to-MC conversion. This work represents the first example of mechanochromic acrylic latexes and provides insight into the design of force sensitive and self-reporting polymer coatings.

Negatively charged polysulfone membranes with hydrophilicity and antifouling properties based on in situ cross-linked polymerization.

Polysulfone (PSf) membrane has been widely used in water separation and purification, although, membrane fouling is still a serious problem limiting its potential. We aim to improve the antifouling of PSf membranes via a very simple and efficient method. In this work, antifouling PSf membranes were fabricated via in situ cross-linked polymerization coupled with non-solvent induced phase separation. In brief, acrylic acid (AA) and vinyltriethoxysilane (VTEOS) were copolymerized in PSf solution, then directly casted into membranes without purification. With the increase of monomers concentration, the morphology of the as-cast membranes changed from a finger-like morphology to a fully sponge-like structure due to the increased viscosity and decreased precipitation rate of the polymer solutions. Meanwhile, the hydrophilicity and electronegativity of modified membranes were highly improved leading to inhibited protein adsorption and improved antifouling property. Furthermore, in order to further find out the different roles player by AA and VTESO, the modified membrane without VTEOS was prepared and characterized. The results indicated that AA is more effective in the membrane hydrophilicity improvement, VTEOS is more crucial to improve membrane stability. This work provides valuable guidance for fabricating PSf membranes with hydrophilicity and antifouling property via in situ cross-linked polymerization.

Polysulfone hemodiafiltration membranes with enhanced anti-fouling and hemocompatibility modified by poly(vinyl pyrrolidone) via in situ cross-linked polymerization

Poly(vinyl pyrrolidone) (PVP) and its copolymers have been widely employed for the modification of hemodiafiltration membranes due to their excellent hydrophilicity, antifouling and hemocompatibility. However, challenges still remain to simplify the modification procedure and to improve the utilization efficiency. In this paper, antifouling and hemocompatibility polysulfone (PSf) hemodiafiltration membranes were fabricated via in situ cross-linked polymerization of vinyl pyrrolidone (VP) and vinyltriethoxysilane (VTEOS) in PSf solutions and non-solvent induced phase separation (NIPS) technique. The prepared membranes were characterized by attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM), which suggested that VP and VTEOS have been cross-linked copolymerized in PSf membranes. The modified PSf membranes with high polymer content showed improved hydrophilicity, ultrafiltration and protein antifouling ability. In addition, the modified PSf membranes showed lower protein adsorption, inhibited platelet adhesion and deformation, prolonged the activated partial thromboplastin time (APTT), prothrombin time (PT), and decreased the content of fibrinogen (FIB) transferring to fibrin, indicating enhanced hemocompatibility. In a word, the present work provides a simple and effective one-step modification method to construct PSf membranes with improved hydrophilicity, antifouling and hemocompatibility.

水性UV固化耐刮划纳米复合膜的研究开发

传统油性UV (紫外光)固化涂料大部分具有强烈气味，对环境和人体健康有害，本项目旨在研究开发出安全环保的绿色涂料。以水溶性脂肪族聚氨酯丙烯酸酯为主料，乙烯基三乙氧基硅烷为改性添加剂，采用溶胶-凝胶法，与铝溶胶混合，通过紫外光固化制备出水分散型复合体系，经表面涂装工艺对软质材料进行表面处理，提高其附着力及膜表面的耐刮划性能。 Most traditional oily UV-curable coatings have a strong odor, which is harmful to our environment and health. This project aims to develop a safe and environmental paint. This main material of the paint is water-soluble aliphatic polyurethane acrylate and modifying additive is vinyl triethox-ysilane. It’s mixed with aluminum sol by sol-gel method and solidified by UV, and then forms a water-dispersed composite system. Applying surface coating process on soft materials improves its adhesion and scratch-resistant performance.

Vinyltriethoxysilane as an electrolyte additive to improve the safety of lithium-ion batteries

Vinyltriethoxysilane (VTES) is a promising environmentally-friendly additive for electrolytes to improve the safety of LIBs.