Abstract
AbstractThe relationship of the glass transition temperature, Tg, to fractional conversion, x, for the conversion of the cyclohexylmethyl ester of the benzophenone tetracarboxylic dianhydride–oxydianiline polyamic acid to polyimide has been investigated using dynamic mechanical analysis (torsion pendulum, TBA). The glass transition temperature and conversion measurements were obtained on a single solvent‐free polyamic acid ester specimen during cooling after heating to successively higher cure temperatures. Conversion was determined from the intensity of a sub‐Tg mechanical relaxation peak that has been assigned to a relaxation of the cyclohexyl group. The resulting Tg versus x relationship is nonlinear. The Tg versus x relationship is adequately modeled using an expression derived by Couchman. © 1994 John Wiley & Sons, Inc.
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