中温成型含硅可溶性聚酰亚胺薄膜及其性能研究

Medium Temperature Molding and Properties of Silicon Soluble Polyimide Film

通过引入柔性结构单元、有机硅单元、三氟甲基和共聚的方法成功地合成了七种可溶性聚酰亚胺,并将其在有机溶剂中溶解后,经流涎法制得了一系列可中温成型的聚酰亚胺薄膜材料。利用相关的检测方法考察了所得聚酰亚胺的结构及性能。结果表明:所合成的聚酰亚胺在有机溶剂中均具有优异的溶解性能。所得线性聚酰亚胺产物中,GAPD摩尔含量为10%的含氟聚酰亚胺PI-S7具有最为优异的综合性能。其特性粘度为0.392 dL/g,5%热失重温度为519℃,T g为311℃,拉伸强度为79 MPa,断裂伸长率为25%,附着力等级为0级。

Seven kinds of linear soluble polyimides were prepared by copolymerization and incorporation of flexible units,organic silicon and trifluoro-methyl substituent into the polymer structure.After film coating with the solution of polyimides,the membranes could be obtained by evaporation of solvent at 120℃.The obtained polyimides’structures and performance were characterized by Fourier transform infrared spectroscopy(Fr-IR),thermal gravimetrie analysis(TGA),differential scanning calorimetry(DSC),and so on.Results showed that all of the obtained polyimides showed excellent solubility in solvents.The fluorine-containing polyimides with molar content of GAPD being 10%showed the best combination property in all of the obtained linear polyimides,with the intrinsic viscosity 0.392 dL/g,5%weight loss temperature 519℃,T g=311℃,the tensile strength 79 MPa and elongation at break 25%,level of adhesion zero.