Traditional polyimides exhibit a brownish-yellow color in the visible light spectrum due to charge-transfer complexes (CTCs) within their molecular structure. Transparent polyimides suppress CTC formation by introducing fluorine substitution, alicyclic structures, non-coplanar side-chain monomers, or diamine/dianhydride monomers containing functional groups like sulfonyl or ether bonds. This weakens intramolecular electron donor-acceptor interactions, enhancing visible light transmittance and reducing the yellow index (YI). The following tables list examples of commonly used CPI monomers reported in recent literature:
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