Preparation and Properties of Poly(Amide-Imide) Containing Acetylene Units in the Main Chain

Abstract

Poly(amide-imide) containing internal acetylene units in the backbone was prepared from trimellitic anhydride chloride and bis(3-aminophenyl)acetylene in N-methyl-2-pyrrolidone at room temperature, followed by thermal imidization. Differential scanning calorimetry measurements of the poly(amide-imide) showed an exotherm due to the crosslinking reaction of the internal acetylene units. With higher heat treatment, the exotherm shifted to higher temperatures and the amount of the exotherm decreased. The exotherm finally disappeared after 400 °C treatment. Viscoelastic measurements revealed that the crosslinked polymer had a higher glass transition temperature and maintained a storage modulus up to higher temperatures. The thermogravimetric analyses profile showed that the crosslinking of internal acetylene units gave a thermally stable structure.

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