引入二苯基芴基团聚酰亚胺薄膜性能的研究

Study on the performance of polyimide film with diphenyl fluorenyl group

良好的感湿性材料应具备优良的水蒸汽透过性和相对较低的吸水性,为了获得良好的感湿性材料,设计合成含二苯基芴结构的二胺(9,9′-双[4-(2-三氟甲基-3-硝基苯氧基)苯基]芴)(BFAPH),进而与3,3′,4,4′-联苯四甲酸二酐(BPDA)、3,3′,4,4′-二苯醚四甲酸二酐(ODPA)、4,4′-(六氟异丙烯)二酞酸酐(6FDA)缩聚制得3种聚酰亚胺(PI)薄膜(PI-1,PI-2,PI-3)。对以上3种PI薄膜进行热学、力学测试,结果表明,3种PI薄膜的5%(wt,质量分数)热损失温度都在520℃以上,均具有良好的耐热性能,其中,PI-2的玻璃化转变温度最高,为288.49℃。3种薄膜的水蒸汽透过性均在6.45g/h·m2以上,尤其PI-3的水蒸汽透过性可以达到9.80g/h·m2,说明二苯基芴基团的引入提高了薄膜对水蒸汽的透过能力,并且6FDA中的三氟甲基基团存在使得PI-3薄膜疏水性大大增强。PI-3薄膜完全符合良好感湿性材料所具备的条件。

Good humidity sensing materials should have excellent water vapor permeability and relatively low water absorption.To obtain the materials with excellent humidity sensing,9,9′-bis[4（2-trifluoromethyl-3-nitrophenoxy）phenyl]fluorine（BFAPH）which contained diphenyl fluorenyl structure was synthesized.Three types of polyimide film（PI-1,PI-2,PI-3）were prepared by using BFAPH with 3,3′,4,4′-biphenyltetracarboxylic dianhydride（BPDA）,3,3′,4,4′-diphenyl ether dianhydride（ODPA）,4,4′-（Hexafluroisopropylidene）diphthalic anhydride（6FDA）.The thermodynamics testing showed that the temperature of 5%（wt,weight%）mass loss of polyimide films was higher than 520℃.The glass transition temperature of PI-2 was 288.49℃,it was the highest.They had good water vapor permeability which was higher than6.45g/h·m^2,especially the water vapor permeability got as high as 9.80g/h·m^2,which illustrated that the introduce of diphenyl fluorine group could improve the water vapor permeability of films.and the existence of trifluoromethyl groups in6 FDA increased the hydrophobic properties of PI-3.PI-3film was good sensing materials.