Preparation and properties of colorless transparent polyimide films
The asymmetric hydrazide structure Isophthalohydrazide(IDH)was introduced into the molecular struc-ture of 2,2-Bis(trifluoromethyl)-4,4-biphenyldiamine-Biphthalicanhydride-4,4-(hexafluoroisopropylidene)diph-thalicanhydride(TFDB-BPDA-6FDA),and PI films were prepared by two-step method.UV Spectrophotometer and universal testing machine were used to test the transmittance and mechanical properties of the film.The results showed that the appropriate introduction of Isophthalohydrazide could not only maintain the excellent light transmit-tance of CPI film,but also improve its elastic modulus,which has the application potential in flexible cover materi-als.
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