摘要
以4,4′-(六氟异丙烯)二酞酸酐(6FDA)为含氟二酐,4,4′-二氨基-2,2′-双三氟甲基联苯(TFMB)为含氟二胺,通过引入分子结构相对对称的刚性单体1,2,4,5-均苯四甲酸二酐(PMDA)进行共聚合成了5种含氟比例不同的透明聚酰亚胺薄膜,并对其性能进行了表征。分析表明:引入刚性单体共聚后薄膜的热稳定性和耐热性有所提高;薄膜的介电常数随着PMDA含量的上升而增加;共聚薄膜在可见光领域的透光率低于均聚薄膜;拉伸实验显示在添加少量PMDA后,薄膜的拉伸强度和弹性模量有所增大,但当PMDA含量过高时其力学性能反而下降;随着PMDA含量的增加,薄膜的热膨胀系数明显降低。
Five transparent polyimide thin films with different proportions of1,2,4,5-,pyromellitic dianhydride (PMDA) were made by copolymerization of4,4′-(six fluoro isopropenyl) two phthalic anhydride (6FDA),4,4′- two amino -2,2′- double three trifluoromethyl biphenyl (TFMB) and PMDA, and their properties were characterized. The results show that thermal stability and heat resistance are increased after the introduction of rigid monomers;the dielectric constant of the films is increased with the increase of PMDA content;homopolymer film has higher light transmission rate than copolymer films in visible light;tensile test shows that adding a small amount of PMDA, the tensile strength and elastic modulus of the film are increased, but when the content of PMDA is higher than 40%, the mechanical properties are decreased;the coefficient of thermal expansion of the films are decreased obviously while PMDA content is increased.
作者
张明艳
高升
吴子剑
崔宏玉
高岩
ZHANG Ming-yan;GAO Sheng;WU Zi-jian;CUI Hong-yu;GAO Yan(School of Materials Science and Engineering,Harbin University of Science and Technology,Harbin150040,China;Engineering Dielectrics and Its Application Key Laboratory(Ministry of Education),Harbin Universityof Scienceand Technology,Harbin 150080,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2019年第5期153-158,共6页
Journal of Materials Engineering
基金
国家自然基金面上项目(51677045)
黑龙江省博士后面上项目一等资助(LBH-Z16089)
中国博士后面上项目一等资助(2017M610212)
关键词
聚酰亚胺薄膜
透明
含氟
共聚
热膨胀系数
polyimide film
transparent
fluorine containing
copolymerization
coefficient of thermal expansion