Synthesis and Characterization of Main Chain Degradable Poly(amide-imide)s with Acetal Unit

Abstract

A series of main chain degradable poly(amide-imide)s 7 were prepared from acetal-containing diimide-dicarboxylic acid 5 with various aromatic diamine monomers 6 by the direct polycondensation in NMP using triphenyl phosphite/pyridine as condensing agents. The novel diimide-dicarboxylic acid 5 bearing 2-trifluoromethylphenyl substituted acetal unit was synthesized by the condensation reaction of amine compound 4 with trimellitic anhydride. All the polymers were obtained in quantitative yields with inherent viscosities of 0.41-0.53 dl g^-1. The structure of polymers was confirmed by IR, ¹H NMR and ¹³C NMR spectroscopy The poly(amide-imide)s obtained were soluble in polar solvents such as NMP and DMAc. Most were cast into transparent and flexible films, which had tensile strengths ranging from 40 to 80 MPa, elongation-to-breakage from 2.8 to 6.6%, and initial moduli from 1.2 to 1.6 GPa. The glass transition temperatures of these polymers were in the range 208-232°C and showed 5% weight loss temperature ranging from 350 to 385°C under air or nitrogen atmosphere. Furthermore, the acid-catalyzed degradation behavior of poly(amide-imide)s 7 was also investigated.

Keywords

Poly(amide-imide)acetal unit degradable

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