SOLVENT INDUCED CRYSTALLIZATION AND CHANGES OF SURFACE MORPHOLOGIES OF AMORPHOUS POLY(ETHYLENE TEREPHTHALATE) FILMS ACCOMPANYING AMINOLYSIS
1976 Volume 32 Issue 8 Pages T317-T325
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1976 Volume 32 Issue 8 Pages T317-T325
Amine-induced crystallization of amorphous PET films during aminolysis was studied. Various alkylamines, ammonia, and hydrazine used made amorphous PET films crystallize; especially amines having the solubility paremeter of nearly 9.5 and 12 crystallized PET films fastly. Decrease of molecular weight during aminolysis increased mobilities of the polymer chains, which also seemed to enhance crystallization.
About the cracks observed on the surfaces of PET films accompanying aminolysis were also studied. These cracks were caused mainly by various strain forces in the films than by dissolution of degradation products into the amines, and occurred at the time of removing the amines. Surface morphologies were changed not only by the wav of removing the amines, but also by the fine structure.
