The structural evolution of PVDF upon uniaxial stretching has been investigated by means of in situ SAXS/WAXS experiments. Special attention has been paid to the change in plastic deformation mechanisms as a function of draw temperature. Of prime importance with respect to electroactive properties, the present study confirms that the α to β crystal phase transformation occurs in the whole temperature range between Tg and Tm. However two different plasticity mechanisms are evidenced. In fact, the αc crystalline relaxation, attributed to intracrystalline molecular motions, strongly impacts the deformation behavior. In the high temperature domain, where all mobilities related to the αc relaxation are unlocked, plasticity occurs by crystal block shearing and subsequent fibrillation, while within the αc transition range cavitational modes interfere with the fibrillation process, at the expense of global ductility. A morphological evolution scheme is proposed in the light of the in situ SAXS/WAXS data.
Polymer – Elsevier
Published: Feb 10, 2016
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