Fully aliphatic polyimides (APIs) have been synthesized. APIs were prepared by poly(addition-condensation) of the alicyclic dianhydride bicyclo[2.2.2]octane-2, 3, 5, 6-tetra-carboxylic 2, 3:5, 6-dianhydride with the aliphatic diamine 5-amino-1, 3, 3-trimethylcyclo-hexanemethylamine, the mixture of 2, 5- and 2, 6-bis(aminomethyl)bicyclo[2.2.1]heptane or 1, 4-cyclohexanebis(methylamine) in m-cresol at high temperature. The polymerization proceeded smoothly at 200 °C and produced APIs with inherent viscosities up to 0.48 dl g −1 . The APIs were soluble in a wide range of polar solvents and showed high thermal stability and excellent transparency.
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Seino et al. (1999) studied this question.
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