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Experimental design and response surface methodology(RSM) were used to optimize the modification of conditions for glass surface grafting with acrylamide(AM) monomer for preparation of a glass fiber reinforced poly(vinylidene fluoride)(PVDF) composite membrane(GFRP-CM). The factors considered for experimental design were the UV(ultraviolet)-irradiation time, the concentrations of the initiator and solvent, and the kinds and concentrations of the silane coupling agent. The optimum operating conditions determined were UV-irradiation time of 25 min, an initiator concentration of 0–0.25 wt.%,solvent of N-Dimethylacetamide(DMAC), and silane coupling agent KH570 with a concentration of 7 wt.%. The obtained optimal parameters were located in the valid region and the experimental confirmation tests conducted showed good accordance between predicted and experimental values. Under these optimal conditions, the water absorption of the grafted modified glass fiber was improved from 13.6% to 23%; the tensile strength was enhanced and the peeling strength of the glass fiber reinforced PVDF composite membrane was improved by 23.7% and 32.6% with an AM concentration at 1 wt.% and 2 wt.%. The surface composition and microstructure of AM grafted glass fiber were studied via several techniques including Field Emission Scanning Electron Microscopy(FESEM), Fourier transform infrared spectroscopy-attenuated total reflectance(FTIR-ATR) and energy dispersive X-ray spectroscopy(EDX). The analysis of the EDX and FTIR-ATR results confirmed that the AM was grafted to the glass fiber successfully by detecting and proving the existence of nitrogen atoms in the GFRP-CM. 相似文献
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C. N. Ludvik G. M. Glenn A. P. Klamczynski D. F. Wood 《Journal of Polymers and the Environment》2007,15(4):251-257
Adding cellulose fiber reinforcement can improve mechanical properties of biodegradable plastics, but fiber must be well dispersed
to achieve any benefit. The approach to dispersing fiber in this study was to use aqueous gels of sodium bentonite clay. These
clay-fiber gels were combined with powdered compostable thermoplastics and calcium carbonate filler. The composite was dried,
twin-screw extruded, and injection molded to make thin parts for tensile testing. An experimental design was used to determine
the effect of fiber concentration, fiber length, and clay concentration. Polybutylene adipate/terephthalate copolymer (PBAT)
and 70/30 polylactic acid (PLA)/PBAT blend were the biodegradable plastics studied. The composite strength decreased compared
to the thermoplastics (13 vs. 19 MPa for PBAT, 27 vs. 38 MPa for the PLA/PBAT blend). The composite elongation to break decreased
compared to the thermoplastics (170% vs. 831% for PBAT, 4.9% vs. 8.7% for the PLA/PBAT blend). The modulus increased for the
composites compared to the thermoplastic standards (149 vs. 61 MPa for PBAT, 1328 vs. 965 MPa for the PLA/PBAT blend). All
composite samples had good water resistance. 相似文献
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负载工艺对ACF担载二氧化钛光催化性能的影响 总被引:1,自引:1,他引:0
采用分散液中添加环氧树脂黏结剂并进行热处理的方法,制备出活性炭纤维(ACF)担载二氧化钛光催化材料。并对光催化材料的表面形貌和孔结构进行表征,评价复合光催化材料对亚甲基蓝溶液的光催化降解性能。重点探讨了负载方式、负载时间以及光催化剂的添加量等方面对光催化活性的影响。研究表明,当采用浸渍方式、负载时间控制在15 min左右、光催化剂添加量达11 g/L时,ACF/TiO2光催化复合材料中光催化剂负载量最佳,在15%左右,对亚甲基蓝(初始浓度为50 mg/L)的降解效果最好,在2 h内可以达到90%。 相似文献
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Peng Ye Lauren Reitz Chris Horan Richard Parnas 《Journal of Polymers and the Environment》2006,14(1):1-7
Wheat gluten is a naturally occurring protein polymer. It is biodegradable and very inexpensive (less than $1.00/kg). Nonfood
applications of wheat gluten have been explored to develop biodegradable polymers from renewable resources. In this work,
gluten was reinforced with unidirectional basalt fibers in a compression molding operation. Biodegradation behavior of wheat
gluten/basalt composites was examined by putting specimens into soil of prescribed moisture content. Specimens were removed
at various time intervals and tested for mass loss and change in mechanical properties. Both mass and mechanical properties
show a steady decline over a soil exposure time of 40 days. However, the basalt composite retained mechanical properties longer.
At the same time, the bacterial count on the specimen surfaces increased exponentially. Field emission scanning electron microscope
images show smooth fracture surfaces, indicating brittle failure of the wheat gluten. However, there are many small holes
in the protein matrix with diameter of order 100 nm. These small inclusions may contribute to the brittleness through stress
concentration. 相似文献
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《International Journal of Sustainable Engineering》2013,6(4):233-239
ABSTRACTThe high-performance carbon fibres can be recycled from waste carbon fibre/epoxy resin composites by supercritical n-butanol. Recycling experiment designed by response surface method was used to investigate quantitative relation between degradation rate of epoxy resin and process parameters. Thus, the optimum process parameters could be obtained, and effects of process parameters and layers on degradation rate and mechanical performance of the recycled carbon fibres were analysed. The tensile strength of the recycled carbon fibre under the optimum process parameters was 94.53% of that of the original carbon fibre, tensile modulus was 93.57% of that of the original carbon fibre and interfacial shear strength was 90% of that of the original carbon fibre. 相似文献
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