共聚型含氟聚酰亚胺薄膜的制备与性能

Preparation and Properties of Copolymerized Fluorinated Polyimide Film

采用4,4’-六氟异丙基邻苯二甲酸酐(6FDA)、均苯四甲酸二酐(PMDA)、3,3’,4,4’-联苯二酐(s-BPDA)、2,2’-双(三氟甲基)-4,4’-二氨基联苯(TFMB)、对苯二胺(p-PDA)、联苯胺(HMB)和4,4’-二氨基-2,2’-二甲基-1,1’-联苯(m-TOL)共聚制备了聚酰胺酸(PAA)溶液,经流延涂膜、去溶剂、亚胺化等步骤得到了一系列聚酰亚胺(PI)薄膜。利用傅里叶变换红外光谱仪(FTIR)、电子万能试验机、紫外可见光度计、差示扫描量热仪(DSC)等手段对其结构和性能进行了分析。结果表明:以s-BPDA制得的PI薄膜的拉伸强度高达115.70 MPa,断裂伸长率为8.30%,最大光透过率为91.35%,玻璃化转变温度为318.06℃,在保持优异光透过性的同时拥有较好的力学性能和热性能。

4,4’-(hexafluoroisopropylidene)diphthalic anhydride(6FDA),1,2,4,5-Benzenetetracarboxylic anhydride(PMDA),3,3’,4,4’-Biphenyltetracarboxylic dianhydride(s-BPDA),2,2’-Bis(trifluoromethyl)benzidine(TFMB),p-Phenylenediamin(p-PDA),Benzidine(HMB)and 2,2’-Dimethyl-4,4’-biphenyldiamine(m-TOL)were selected to synthesize polyamide acid(PAA)by copolymerization,and a series of polyimide(PI)films were obtained by casting film,desolvent and imidization.The structures and properties of PI films were analyzed by FTIR,electronic universal testing machine,UV-vis spectrum analysis,DSC and so on.The results indicat that the PI film made by s-BPDA has tensile strength as high as 115.70 MPa and its elongation at break is 8.30%.Besides,its maximum light transmittance is 91.35%,while the glass transition temperature is 318.06℃.This shows that the PI film has good mechanical properties and heat resistance with maintaining excellent optical transmittance.