Abstract
New phenolic hydroxyl-pendant aromatic polyimides were synthesized with the N-silylated diamine method in two steps: the ring-opening polyaddition of tetrakis(trimethylsilyl)-substituted 4,4′-diamino-3,3′-dihydroxybiphenyl to various aromatic tetracarboxylic dianhydrides, giving trimethylsiloxy-pendant poly(amic acid) trimethylsilyl esters, and thermal imidization. The hydroxyl-bearing polyimides were amorphous but insoluble in organic solvents. They had glass-transition temperatures greater than 370 °C and temperatures of 10% weight loss greater than 415 °C in nitrogen. The hydroxyl-pendant polypyromellitimide film had a high tensile strength and a high modulus of 310 MPa and 10 GPa, respectively. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 1790–1795, 2002
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