摘要
以异氰尿酸三缩水甘油酯(TGIC)与六亚甲基二异氰酸酯(HDI)为联用扩链剂,对聚对苯二甲酸乙二醇酯(PET)粒料进行反应挤出。对比了2种扩链剂单独使用与联用对PET扩链的影响,进一步研究了联用质量分数与配比对扩链PET特性黏度、流变性能和结晶性能的影响。结果表明,TGIC与HDI二者联用时比单独使用时对PET的扩链效果要好。当m(TGIC)∶m(HDI)=4∶6,百分含量为1.0%时,扩链PET熔体表现出明显的剪切变稀现象;熔体流动速率降至8.50 g/10 min;而且扩链产物溶解时出现凝胶,去除凝胶后的特性黏度仍能达到1.18 dL/g;扩链PET的熔融曲线出现双峰,但未产生新的晶型;其结晶度降至26.8%,半结晶时间降至2.91 min,结晶温度降至204.2℃。
Using triglycidyl isocyanurate(TGIC)and hexamethylene diisocyanate(HDI)as combined chain extender,polyethylene terephthalate(PET)pellets were processed by reactive extrusion.The effects of the two chain extenders used alone and combined on the chain extension of PET were compared,and the effects of the percentage and ratio of combined chain extenders on the intrinsic viscosity,rheological properties,and crystallization properties of the extended chain PET were further investigated.The results show that the combination of TGIC and HDI has better effect on the chain extension of PET than the single use.When m(TGIC)∶m(HDI)=4∶6 and the content is 1.0%,the chain-extended PET melt shows obvious shear thinning phenomenon;the melt flow rate is reduced to 8.50 g/10 min;and a gel appears when the chain extension product is dissolved,the intrinsic viscosity after gel removal is still the highest,reaching 1.18 dL/g;the crystallinity of the extended-chain PET is reduced to 26.8%,the half-crystallization time is reduced to 2.91 min,and the crystallization temperature is lowered to 204.2℃.
作者
刘少峰
夏艳平
顾艺
李强
马文中
曹峥
陶国良
Shaofeng Liu;Yanping Xia;Yi Gu;Qiang Li;Wenzhong Ma;Zheng Cao;Guoliang Tao(School of Materials Science & Engineerings Changzhou University,Changzhou 213164,China;Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering,Changzhou University,Changzhou 213164,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2019年第5期63-70,共8页
Polymer Materials Science & Engineering
基金
江苏省光伏科学与技术国家重点实验室培育建设点开放课题(SKLPSTKF201503)
国家自然科学基金资助项目(21704008)
关键词
聚对苯二甲酸乙二醇酯
扩链剂联用
特性黏度
结晶
流变
polyethylene terephthalate
chain extender combination
intrinsic viscosity
crystallization
rheology
作者简介
通讯联系人:陶国良,主要从事聚合物加工改性研究,E-mail:taogl306@163.com.
