超支化聚酯制备高玻纤含量的尼龙/玻纤复合材料

摘要

Nylon-6 and glass fiber (PA-6/GF)composites with high flowability and high content (50wt%)of glass fiber was prepared by using a novel carboxyl-ended hyperbranched polyester (DCHP-n).The effects of DCHP-n content and molecular weight on performance of the composites were studied in detail,including melt flow index,tensile strength,flexural strength,impact strength,and heat resistance.The results show that the DCHP-n could increase the melt index of the composites from 15 to 30.8 g/10 min,being attributable to the fact that the spherical structure of the hyperbranched polymer molecule is easily dispersed into the intermolecular chains of nylon and promotes the sliding between the nylon molecular chains.The tensile strength and flexural strength of the PA-6/GF composites were increased from 142.8 and 89.3 MPa to 163.5 and 93 MPa,respective-ly,resulted from an increase in interaction between the glass fiber surface and nylon due to hydrogen bond be-tween the carboxyl groups of DCHP-n and the hydroxyl groups of the glass fiber,and the conclusion has been substantiated by the SEM micrographs of impact fractured surface of DCHP-n/PA-6/GF composites.%以新型的端羧基超支化聚酯(DCHP-n)改性尼龙-6/玻纤(PA-6/GF)复合材料,制备高流动性和高玻纤含量(5 0%(质量分数))的复合材料,研究了端羧基超支化聚酯的含量和分子量对复合材料的综合性能的影响,包括熔融指数、拉伸强度、弯曲强度、冲击强度及耐热性等.结果表明,DCHP-n 能使复合材料的熔融指数从 15 g/10 min提高到30.8 g/10 min,原因是似球形结构的超支化聚合物分子容易分散进入尼龙分子链之间,促进尼龙分子链间的滑移;DCHP-n 能使复合材料的拉伸强度和弯曲强度分别从 142.8 和 89.3 MPa 增加到 163.5 和93 MPa,DCHP-n的羧基与玻纤表面的羟基之间的氢键相互作用增大了尼龙与玻纤之间的界面强度和相容性, SEM分析也证实了DCHP-n能增加复合材料的界面相互作用和相容性.