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采用碱处理、碱-偶联剂联合处理对竹原纤维进行表面改性,通过缝合-模压工艺制备了单向连续竹原纤维/不饱和聚酯树脂(BF/UP)复合材料。研究了不同表面改性方法对BF/UP复合材料静态、动态力学性能、吸水性能等的影响,并用SEM、红外光谱等技术研究了改性处理后纤维的表面及复合材料界面结合情况。结果表明:经过不同表面处理后BF/UP复合材料的性能均有所改善。当采用5wt%碱-3wt%偶联剂联合处理时,BF/UP复合材料综合性能最优,其拉伸强度、弯曲强度、弯曲模量、剪切强度较未处理的分别提高了34.29%、15.95%、11.26%、29.39%;复合材料存储模量(33℃)较未处理的提高了63.80%,损耗因子有所降低;BF/UP复合材料24h、720h吸水率较未处理的分别减小了55.35%、27.32%。SEM和红外光谱结果表明,改性处理后竹原纤维表面杂质减少,附着了一层偶联剂膜,BF/UP复合材料中纤维与树脂之间的界面结合更好。
Alkaline treatment and alkali-coupling agent were used to modify the surface of bamboo fiber. One-way continuous bamboo fiber / unsaturated polyester resin (BF / UP) composite was prepared by stitching-molding. The effects of different surface modification methods on the static and dynamic mechanical properties and water absorption properties of BF / UP composites were studied. The surface and interface bonding of modified composites were studied by SEM and FTIR. The results show that the properties of BF / UP composites are improved after different surface treatments. When combined with 5wt% alkali-3wt% coupling agent, the properties of BF / UP composites were the best, and their tensile strength, flexural strength, flexural modulus and shear strength increased by 34.29% 15.95%, 11.26% and 29.39% respectively. The storage modulus (33 ℃) of composites increased 63.80% and the loss factor decreased compared with untreated ones. The water absorption of BF / 55.35%, 27.32%. The results of SEM and FTIR showed that the surface impurities of bamboo fiber decreased after modification, and a film of coupling agent was attached. The interface between fiber and resin in BF / UP composite was better.