摘要
聚醚醚酮(PEEK)具有优异的性能而广泛应用于高端装备领域,但PEEK熔体加工窗口较狭窄,可加工性差。热致液晶聚合物(TLCP)是一种具有优异的加工流动性和尺寸稳定性以及能原位成纤起到自增强作用的液晶聚合物。本文采用体积拉伸流场作用为主导的偏心转子挤出机制备了不同TLCP含量的PEEK/TLCP共混物,研究了拉伸流场下的PEEK/TLCP共混物的流变性能、微观形貌、热性能及结晶性能。结果表明,在拉伸流场的作用下,TLCP的加入能有效拓宽PEEK的加工区间,使得体系低剪切速率下体系黏度降低了14.43%,高剪切速率下体系黏度降低了80.68%。在拉伸流场作用下,TLCP可以在较宽含量范围内在PEEK中基体中形成与挤出方向一致的纤维结构,低含量下的TLCP可以促进PEEK基体结晶。10%(质量分数,下同)含量TLCP的PEEK/TLCP共混物的最大拉伸强度比PEEK基体增加了4.6%,达86.60 MPa。
Poly(ether ether ketone)(PEEK)has excellent performance and has been widely used in the high⁃end equip⁃ment field;however,the processing window of the PEEK melt is narrow and its processability is poor.Thermotropic liq⁃uid crystal polymer(TLCP)is a liquid crystal polymer with excellent dimensional stability,good processing fluidity,and a unique in⁃situ fiber self⁃reinforcing effect.In this study,PEEK/TLCP blends with different contents of TLCP were prepared by mean of an eccentric rotor extrusion mechanism dominated by a volume tensile flow field.The rheological properties,micromorphology,thermal properties and crystallization properties of PEEK/TLCP blends were studied un⁃der a tensile flow field.The results indicated that the addition of TLCP effectively broadened the processing range of PEEK under the tensile flow field.This resulted in a decrease in the viscosity of the system by 14.43%at a low shear rate and by 80.68%at a high shear rate.Owing to the action of tensile flow field,TLCP formed a fiber structure along the extrusion direction in the PEEK matrix over a wide range of content,and it also could promote the crystallization of the PEEK matrix at a low content.The blend containing 10 wt%TLCP obtained maximum tensile strength of 86.60 MPa,which was 4.6%higher than that of the PEEK matrix.
作者
任国振
王蒙蒙
黄建建
晋刚
REN Guozhen;WANG Mengmeng;HUANG Jianjian;JIN Gang(Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing,Key Laboratory of Polymer Processing Engineering of Ministry of Education,National Engineering Research Center of Novel Equipment for Polymer Processing,School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,China)
出处
《中国塑料》
CAS
CSCD
北大核心
2023年第8期1-7,共7页
China Plastics
基金
国家重点研发计划:高性能热致液晶聚合物产业化关键技术(2017YFB0307603)。
关键词
热致液晶聚合物
聚醚醚酮
体积拉伸流场
原位微纤化
共混改性
thermotropic liquid crystal polymer
poly(ether⁃ether⁃ketone)
volume elongation flow field
in⁃situ microfibrilation
blending modification
