Abstract
Poly(p-phenyleneterephtalamide) (PPTA) has been prepared in high molecular weight (MW) by raising either a p-phenylenediamine (PPD)-phenylterephtalate (DPT)-catalyst mixture or a low MW PPD-DPT prepolymer to about 500-550 o C for a short time by novel techniques. The polymerization mechanism is investigated. This high temperature PPTA is inevitably associated with a degree of chain branching which has a profound adverse effect on the rheology of PPTA solutions
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