摘要
针对聚对苯二甲酸乙二酯(PET)结晶速率慢和韧性差的不足,通过熔融共混的方法,采用柠檬酸钠(SC)对PET的结晶行为进行调控从而达到改善其力学性能的目的,考察了SC对PET结晶行为、球晶形貌、晶体结构及力学性能等的影响。结果表明:SC对PET具有显著的成核作用,w(SC)为0.6%时,其结晶温度较纯PET提高了约8.4℃,成核效率达到了38.2%,结晶速率较纯PET增加了1倍;SC对PET的晶体结构没有太大的影响,但降低了PET结晶的长周期;SC可有效增加PET的成核密度;同时,添加SC可以改善PET的缺口冲击韧性和拉伸性能,w(SC)为0.6%时,复合材料的缺口冲击强度较纯PET高约1.3倍,抗拉强度较纯PET高约1.2倍。
Sodium citrate(SC)was used as a modifier to mediate the crystallization behaviors of poly(ethylene terephthalate)(PET)via melt blending method to improve the mechanical properties of PET,which aims to resolve the problems of slow crystallization rate and poor toughness of PET.The effect of SC on the crystallization behaviors,spherulite morphology,crystal structure and mechanical properties of PET were investigated.The results show that SC has a significant nucleation effect on PET.When the mass fraction of SC is 0.6%,the crystallization temperature of the modified PET is increased by 8.4℃than that of pure PET,the crystallization rate doubles,and the nucleation efficiency reaches 38.2%.Though the addition of SC does not change the crystal structure of PET,it helps to reduce the long period of PET crystallization.The addition of SC effectively improves the nucleation density,the notched impact toughness and tensile properties of PET.The notched impact strength and tensile strength of the modified composites are higher than those of pure PET by about 1.3 times and 1.2 times respectively when the mass fraction of SC is 0.6%.
作者
王迪然
罗发亮
赵阿龙
Wang Diran;Luo Faliang;Zhao Along(State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering,Ningxia University,Yinchuan 750021,China)
出处
《合成树脂及塑料》
CAS
北大核心
2018年第1期23-29,共7页
China Synthetic Resin and Plastics
基金
宁夏"化学工程与技术"国内一流学科建设项目(宁教高[2017]121号)
省部共建煤炭高效利用与绿色化工国家重点实验室建设资金(宁国科发基[2017]7号)
国家自然科学基金(51063004)
关键词
聚对苯二甲酸乙二酯
柠檬酸钠
结晶性能
力学性能
poly(ethylene terephthalate)
sodium citrate
crystallization property
mechanical property
作者简介
王迪然,男,1992年生,在读研究生,主要研究方向为高分子材料改性。E-mail:334001779@qq.com。;通信联系人。E-mail:flluo@iccas.ac.cn。
