摘要
以等规聚丙烯(iPP)为原料,呋喃取代苯乙烯为单体,利用熔融接枝法制备了侧基含有呋喃取代基的聚丙烯(fPP),再通过加入交联剂,利用Diels-Alder反应直接从螺杆挤出机中制备交联聚丙烯(cPP)。采用^(1)H NMR,FTIR,DSC等方法研究了fPP和cPP的结构与性能。实验结果表明,通过调节呋喃取代苯乙烯加入量能实现fPP侧基呋喃含量的调控;通过改变马来酰亚胺与呋喃的比例可对cPP的交联程度进行调节。cPP在加工温度下可实现解交联,且不影响自身的加工性能。cPP保持了高熔点和高结晶度,较线型iPP具有更高的杨氏模量和更好的抗蠕变性,同时Diels-Alder反应的热可逆性赋予cPP良好的熔融加工性。
Polypropylene containing furan substituted group(fPP)was synthesized by melt grafting reaction with isotactic polypropylene(iPP)as raw material and furyl-functionalized styrene as monomer.Cross-linked polypropylene(cPP)was then prepared directly from screw extruder via Diels-Alder reaction by adding cross-linking agent.The structure and properties of fPP and cPP were characterized by ^(1)H NMR,FTIR and DSC.The results showed that the furan content in fPP could be designed by controlling the furyl-functionalized styrene concentration,and the cross-linking degree of cPP could be adjusted by changing the ratio of maleimide to furan.The cPP de-cross-linking could be realized at the melting processing temperature without influencing the material processing performance.With high melting point and high crystallinity,cPP exhibited higher Young’s modulus and better creep resistance than that of linear iPP.And also the thermal reversibility of Diels-Alder reaction contributed cPP to form good melting reprocessability.
作者
谢诗琪
牛慧
Xie Shiqi;Niu Hui(Department of Polymer Science and Engineering,School of Chemical Engineering,Dalian University of Technology,Dalian Liaoning 116024,China)
出处
《石油化工》
CAS
CSCD
北大核心
2021年第6期547-553,共7页
Petrochemical Technology
关键词
等规聚丙烯
熔融改性
可逆交联
isotactic polypropylene
melting modification
reversible cross-linking
