聚酰胺酸溶液酰亚胺化程度控制及其对PI薄膜性能影响  

Control of Imidization Degree of Polyamic Acid Solution and Its Effect on Properties of Polyimide Film

作　　者：翟燕[1] 梁淑君[1] 刘艳军[1] 李歆[1] 

机构地区：[1]太原工业学院材料工程系,太原030008

出　　处：《工程塑料应用》2016年第5期47-50,共4页Engineering Plastics Application

基　　金：山西省国际科技合作计划项目(2011081024)

摘　　要：乙酐/吡啶混合溶剂加入均苯四羧酸二酐(PMDA)–4,4’–二氨基二苯醚(ODA)型聚酰胺酸溶液中,发生化学酰亚胺化,得到酰胺酸-酰亚胺共聚物(PA–I)。通过旋转黏度计和傅立叶变换红外光谱的系统研究,当酰亚胺化程度达到26%左右时,溶液发生相分离。选择合适的溶液浓度、乙酐含量、反应时间,能够对PA–I均相溶液的酰亚胺化程度实施控制。用不同酰亚胺化程度的PA–I溶液进行热酰亚胺化,获得聚酰亚胺薄膜。研究结果表明,酰亚胺化程度较高的PA–I溶液,所制聚酰亚胺薄膜呈现出较高有序程度的聚集态结构,较高的拉伸强度和拉伸弹性模量。Copolyamic acid-imide (PA–I) could be obtained by chemical imidization when acetic anhydride and pyridine were added into polyamic acid (PAA) based on pyromellitic dianhydride and 4,4′-oxydianiline. When imidization degree of PA–I solution is up to 26%,it occurres phase separation by rotation viscometer and FTIR. Using adequate initial PAA concentration,acetic anhydride amount,and imidization time can control imidization degree of PA–I solution. PA–I solutions with different imidization degree could convert to final polyimide films by thermal imidization. The results show that with imidization degree of PA–I solution increasing,aggregated ordering degree of polyimide film increases,its tensile strength and elastic modulus are improved,and its ultimate elongation at break is reduced slightly.

关 键 词：聚酰亚胺 相分离 酰亚胺化程度 有序程度 

分 类 号：TQ324.8[化学工程—合成树脂塑料工业]