耐高温热塑性聚酰亚胺的结构与性能的关系  

Relationship between Structure and Properties of High Temperature Resistant Thermoplastic Polyimide

作　　者：姚逸伦 张朋 包建文 孙劲松 钟翔屿 YAO Yilun;ZHANG Peng;BAO Jianwen;SUN Jinsong;ZHONG Xiangyu(AVIC Manufacturing Technology Institute,AVIC Composite Technology Center,Science and Technology on Advanced Composites Laboratory,Beijing 101300,China)

机构地区：[1]中国航空制造技术研究院航空工业复合材料技术中心先进复合材料重点实验室,北京101300

出　　处：《塑料工业》2023年第4期40-45,共6页China Plastics Industry

摘　　要：分别采用2,3,3′,4′-联苯四甲酸二酐(α-BPDA)、2,3,3′,4′-二苯醚四甲酸二酐(α-ODPA)、均苯四甲酸二酐(PMDA)、3,3′,4,4′-联苯四甲酸二酐(s-BPDA)以及二胺单体,利用化学亚胺化或热亚胺化方法制备了不同分子结构的热塑性聚酰亚胺树脂模塑粉。借助热重分析(TG)、红外光谱(FTIR)、动态热力学分析(DMA)、扫描电子显微镜(SEM)和力学性能测试等表征分析方法,研究了分子主链结构对热塑性聚酰亚胺理化性能、力学性能的影响。结果表明,基于扭曲非共面联苯结构的α-BPDA合成的LPI-1聚酰亚胺树脂玻璃化转变温度为326℃,5%热分解温度为554℃,冲击强度为88.5 kJ/m 2,拉伸强度为111.3 MPa,兼具较好的耐热性与韧性。Thermoplastic polyimide resin moulding powders with different molecular structures were synthesized by 2,3,3′,4′-biphenyltetracarboxylic dianhydride(α-BPDA),2,3,3′,4′-diphenyl ether tetracarboxylic dianhydride(α-ODPA),pyromellitic dianhydride(PMDA),3,3′,4,4′-biphenyltetracarboxylic dianhydride(s-BPDA)and diamine monomer,using chemical imidization or thermal imidization method.By means of thermogravimetric analysis(TG),Fourier transform infrared spectroscopy(FTIR),dynamic mechanical analyzer(DMA),scanning electron microscope(SEM)and mechanical properties test,effects of different molecular structures on physical,chemical and mechanical properties of thermoplastic polyimides were studied.The results indicate that LPI-1 polyimide resin synthesized byα-BPDA has high heat resistance and toughness,whose glass transition temperature is 326℃,5%thermal decomposition temperature is 554℃,impact strength is 88.5 kJ/m 2,and tensile strength is 111.3 MPa.

关 键 词：热塑性 聚酰亚胺 模塑粉 高温 韧性 

分 类 号：TQ323[化学工程—合成树脂塑料工业]