Abstract
A study has been made of the nature of the spontaneous extension effect occurring during fast electron irradiation of polymers subjected to prior stretching in adsorption-active media. This effect is associated with radiation heating of microporous polymer samples. Manifestation of the effect in amorphous PETP is necessarily related to the presence of crazes with a well developed microfibrillar structure. It was found that the spontaneous extension effect is due to crystallization of partially oriented material in transitional regions relating the oriented material of microfibrils inside crazes to unstrained polymer in interspaces between crazes.
Published Version
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