Paper
New Poly(amide-imide) Syntheses XXII. Synthesis and Properties of Poly(amide-imide)s Based on 1,4-Bis(4-trimellitimidophenoxy)-2-t-butylbenzene and Aromatic Diamines
Published Sep 1, 1998 · Chin‐Ping Yang, S. Hsiao, Huei-Wen Yang
Polymer Journal
8
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Abstract
A diimide dicarboxylic acid, 1,4-bis(4-trimellitimidophenoxy)-2-t-butylbenzene (I), was prepared by the condensation of 1,4-bis(4-aminophenoxy)-2-t-butylbenzene (BAP-tBB) and trimellitic anhydride (TMA) in 1:2 molar ratio. A series of novel poly(amide-imide)s (PAIs) IIIa−1 having inherent viscosities of 0.98–1.51 dL g−1 were prepared by the triphenyl phosphite activated polycondensation from the diimide-diacid I with various aromatic diamines (IIa−1) in a medium consisting of N-methyl-2-pyrrolidone (NMP), pyridine, and calcium chloride. Most of polymers show excellent solubility in amide-type solvents such as NMP and N,N-dimethylacetamide (DMAc) and formed tough, transparent, and flexible films by casting from DMAc solution. These films had tensile strengths of 71–106 MPa, elongations at break of 5–45%, and initial moduli of 2.1–2.9 GPa. Most PAIs necked during the tensile testing. The glass transition temperatures of these polymers were in the range 228–286°C and the 10% weight loss temperatures were above 475°C in air or in nitrogen.
Novel poly(amide-imide)s based on 1,4-bis(4-trimellitimidophenoxy)-2-t-butylbenzene and aromatic diamines show excellent solubility in amide-type solvents and can form tough, transparent, and flexible films with tensile
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