Abstract
The orientation behavior of crystallites during uniaxial stretching and its releasing for spherulite PVA are interpreted in terms of a spherulite deformation mechanism modified from that proposed by Sasaguri, Yamada and Stein (Model 1) and that proposed by Oda (Model 2).Five deformation parameters characterizing the spherulite deformation mechanism, i.e., fraction of the folded-chain type crysta within crystal lamella at undeformed state, easiness of crystal transition from folded chain type to fringed-micellar type, easiness of lamella rotating and lamella sliping to [010] and [001] direction, showed reasonable changes with the stretching of the bulk polymers.For the cold drawn spherulite PVA, the deformation mechanism of its spherulite is interpreted in terms of the lamella rotating around the a axis crystal, but for the hot drawn one, it is interpreted in terms of the lamella sliping to [010] direction of (100) plane.
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