Abstract
A series of polynaphthalimdes from dinaphthalene dianhydride and aromatic diamines mainly with alkyl substituents at ortho position to amine groups along with the model compounds has been synthesized using one-step high temperature polycondensation. It was found that in the case of the model compounds and the polymers synthesized from diamines with alkyl groups having at a carbon two hydrogen atoms, cyclodehydration process can take place during heating or UV irradiation and formation of additional cycle of pyrrole structure was observed. The polynaphthalimides synthesized from aromatic diamines substituted with alkyl groups can be modified under heating or UV irradiation, towards additional ring formation of pyrrole type, which causes an increase of the polymers glass transition temperatures.
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