摘要
为了降低聚己二酸丁二醇-co-聚对苯二甲酸丁二醇酯(PBAT)的熔融指数,在双螺杆中,利用多元环氧扩链剂(ADR)对PBAT进行了扩链反应。基于正交实验对ADR扩链PBAT反应进行了研究,确定了影响反应的主要因素,并对扩链后的树脂进行了流变以及常规性能研究。结果表明,扩链剂浓度对扩链反应速率影响最大,反应温度次之。ADR扩链后,PBAT的分子结构产生了较大变化,形成了支化结构,分子链弹性增强,且扩链剂浓度越高,支化结构越明显。经过ADR扩链后,PBAT树脂的端羧基下降、特性黏度上升、熔融指数降低、熔融温度以及熔融结晶温度略有下降。
In order to reduce the melt flow index,polybutylene adipate-co-polybutylene terephthalate(PBAT)was modified by chain-extension reaction in a twin-screw extruder using a multifunctional epoxy chain extender(ADR).The orthogonal experiment was conducted to study the chain-extension reaction in order to determine the main factors.The results show that the concentration of the chain extender has the greatest effect on the chain-extension reaction rate,followed by the reaction temperature.Furthermore,the rotational rheology and conventional properties of the resin after chain extension were studied.It is found that after the chain-extension reaction,the molecular structure of PBAT has undergone major changes,forming a branched structure,and the elasticity of the molecular chain is enhanced,meanwhile,the higher the concentration of the chain extender,the more obvious the branched structure.After the chain-extension reaction,the terminal carboxyl group content of PBAT resin decreased,the intrinsic viscosity increased,the melt flow index decreased,the melting temperature and the melting crystallization temperature decreased slightly.
作者
潘小虎
李乃祥
王雪盼
戴钧明
梁家晨
Pan Xiaohu;Li Naixiang;Wang Xuepan;Dai Junming;Liang Jiachen(Research Institute of Sinopec Yizheng Chemical Fibre Co., Ltd., Yizheng Jiangsu 211900, China;Jiangsu Key Laboratory of High Performance Fiber, Yizheng Jiangsu 211900,China)
出处
《合成技术及应用》
2021年第2期1-5,62,共6页
Synthetic Technology & Application