Abstract
The copolyimides containing fluorine and alicyclic groups were synthesized from 1,4-bis(4-amino-2-trifluoromethylphenoxy)benzene (6FAPB) and two dianhydrides, 1,2,3,4-cyclobutanetrtracarboxylic dianhydride (CBDA) and 3,3’,4,4’-biphenyltetracarboxylic acid dianhydride (BPDA) in various mole ratios via thermal imidization. The introduction of fluorinated group and alicyclic structure into polyimide improved the transparency of copolyimides. The structure and properties of copolyimides were characterized by FT-IR, UV-vis and solubility testing, and the effect of monomers on the properties of polyimides was also investigated. These experimental results showed that the copolyimides containing a higher mole ratio of CBDA have higher optical transparency and better solubility in organic solvents.
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