Synthesis and Properties of Ternary-Polymerization Benzimidazole Polyimide Films
With the rapid developments of flexible display technology,the high performance transparent polyimide is urgently required.However,how to balance the high transparency,high temperature resistance and high mechanical strength of polyimide is still an important research topic.Here,a series of benzimidazole-based fluorinated transparent polyimide films{2-(4-aminophenyl)-5-aminobenzimidazole(APBIA)/2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane(HFBAPP)/4,4′-diphenyl ether dianhydride(ODPA)}with different molar ratios of APBIA and HFBAPP were prepared by using APBIA as the modified monomer to copolymerize with ODPA and HFBAPP.The structures and properties of polymers were characterized.The results show that when the molar ratio of APBIA in the diamine monomers does not exceed 50%,complete PI films could be obtained.With the synergistic effects of benzimidazole groups and fluorine-containing groups,these films exhibit good comprehensive performances.The highest transmittance in the ultraviolet-visible range reaches 90.16%,and the highest glass transition temperature is up to 277.2℃.The maximum thermogravimetric temperatures of 5%and 10%respectively reach 495 and 520℃,and the maximum tensile strength reaches 184.8 MPa.Specifically,when the molar ratio of APBIA and HFBAPP is 3∶7,the film exhibits the most balanced comprehensive properties.It features a glass transition temperature of 268.9℃,a 5%thermogravimetric temperature of 477℃,a 10%thermogravimetric temperature of 512℃,the highest transmission of 88.92%in the ultraviolet-visible range,and a tensile strength of 184.8 MPa.
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