Abstract
The swelling and deswelling of isotropic and oriented polyamide 11 (PA11) with formic acid have been determined as functions of temperature and acid solution concentration. During swelling, dimension relaxation, partial dissolution of crystallites and extraction of low molecular weight chains occur. During deswelling, amorphous chains recrystallize and after complete drying, the original morphology with the same orientation is restored. This memory effect is due to strain-induced crystallization in the PA oriented gel.
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