Synthesis of polypyromellitimides. Part I. Preparation of poly (4,4-diphenylenemethylenepyromellitamic acid)
Synthesis of polypyromellitimides.
Part I. Preparation of poly (4,4-diphenylenemethylenepyromellitamic acid)
A method of preparing polyamic acid from pyromellitic anhydride and bis-(4-aminophenylene)methane in dimethylformamide has been described. The effect of the following process parameters: time and temperature of reaction, molar ratio and concentration of substrates, stirring velocity and dosing rate of solid pyromellitic anhydride, on the reduced viscosity of polymer has been investigated.
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