Abstract
It has been shown that the intensity of the mechanical field accelerates crystallization to a varying degree in the samples of undrawn polyethyleneterephthalate (PET) fibres investigated. The relation was non-linear. This phenomenon is explained by metastability of the texture in the amorphous PET formed during the spinning to undrawn fibres. The applied mechanical field impedes the destruction of the latter during the passage of the polymer from the glass to the rubber state up until beginning of crystallization.
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