UV老化对ZnO填充PA6/LGF复合材料性能的影响  

Effects of UV Aging on Properties of PA6/LGF Composites Filled with Zinc Oxide

作　　者：何玮頔 郭建兵[1] 陈晓浪[2] 

机构地区：[1]国家复合改性聚合物材料工程技术研究中心,贵阳550014 [2]西南交通大学材料先进技术教育部重点实验室,成都610031

出　　处：《工程塑料应用》2016年第12期98-103,共6页Engineering Plastics Application

基　　金：贵州省高层次创新型人才培养项目(黔科合人才[2015]4039号);贵州省优秀青年科技人才培养对象专项资金项目(黔科合人字[2015]26号);贵州省科技计划(黔科合重大专项字[2015]6005号);贵州省科技计划项目(黔科合成果[2016]4524)

摘　　要：用熔融共混法制备出长玻璃纤维（LGF）含量为30%的LGF增强尼龙6（PA6）/ZnO（PA6/LGF/ZnO）复合材料,并采用氙灯紫外（UV）老化法研究了ZnO含量为0%-8%及UV老化时间为0-800 h对复合材料力学性能和结晶性能的影响。结果表明,经UV辐照后,PA6/LGF/ZnO复合材料的拉伸强度升高,韧性下降,其中当ZnO添加量为6%时,复合材料在800 h老化后的拉伸强度和缺口冲击强度保留率较未添加ZnO的复合材料分别提高了5.39%和4.98%。SEM分析表明在UV老化过程中,LGF与PA6基体之间的界面并未受到明显破坏,老化主要集中发生在PA6基体上。随着老化时间的延长,PA6/LGF复合材料中的PA6出现UV交联而使其结晶度从26.19%降低至20.70%;对于ZnO含量为6%的PA6/LGF/ZnO复合材料,老化800 h后其结晶度仅从22.92%下降至21.34%,PA6/LGF/ZnO复合材料整体上的结晶性能趋于稳定。The long glass fiber （LGF） reinforced polyamide 6 （PA6） composites filled with ZnO （PA6/LGF/ZnO） with 30% LGF were prepared by melt blending method. The mechanical and crystallization properties of PA6/LGF/ZnO composites with different contents of ZnO and different aging time were analyzed by the method of xenon lamp ultraviolet （UV） irradiation aging. The results in mechanical properties show that all the PA6/LGF/ZnO composites after UV aging have an increase in tensile strength and a decrease in impact strength which means a decrease in toughness. When the contents of ZnO are 6%, the retention rate of ten一sile strength and notched impact strength after ageing have a slight increase of 5.39% and 4.98%,respectively. The morphologies of fracture obtained by SEM show that the interface between fiber and matrix are not damaged obviously, and the aging process mainly occurres in the area of PA6 matrix. With longer aging time, the crystallinities of PA6/LGF composites decrease from 26.19% to 20.70%. While the crystallinities of PA6/LGF/ZnO composites filled with 6% ZnO only decrease from 22.92% to 21.34%,which means the more stable crystallization properties are achieved.

关 键 词：长玻璃纤维 尼龙6 紫外老化 氧化锌 复合材料 力学性能 结晶性能 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]