碱处理椰壳纤维织物对环氧树脂基材料拉伸性能影响研究OA北大核心CSTPCD

To evaluate the effect of alkali treatment of coir-geotextile on the tensile properties of epoxy-based materials,two types of alkali solutions,NaOH and NaHCO3,were used for pretreating the coir-geotextile and the effects of alkali solution concentration and treatment time on the surface morphology of the coir-geotextile was investigated.The coir-geotextile with epoxy resin as a substrate was prepared.The results indicated that after the coir-geotextile was treated with 5%NaOH solution for 6h and 10%NaHCO3 solution for 96～168 h,the tensile enhancement effect on the epoxy-based materials presented good consistency,resulting in a maximum value.Based on the analysis of microstructure and FTIR,the surface contour of the coir fiber gradually showed more explicit characteristics with an increase in the treat-ment time with alkali solutions.Beyond the appropriate treatment time,the coir fiber showed a rougher surface,accom-panied by a more apparent large-area corrosion phenomenon.The surface of coir fiber treated with 10%NaHCO3 solu-tion for 96～168 h is similar to that with 5%NaOH solution for 6h.The treatment with an NaHCO3 solution did not damage the cellulose structure of the fiber surface and also did not increase the surface roughness of the fiber significantly.