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Authors Liu, G. ; Schneider, K. ; Zheng, L. ; Zhang, X. ; Li, C. ; Stamm, M. ; Wang, D.
Title Stretching induced phase separation in poly(vinylidene fluoride)/poly(butylene succinate) blends studied by in-situ X-ray scattering
Date 20.05.2014
Number 42861
Abstract The structure evolution of poly(vinylidene fluoride)/poly(butylene succinate) (PVDF/PBS) blends during stretching above the melting point of PBS is investigated by synchrotron-based simultaneous wide angle and small angle X-ray scattering (WAXS/SAXS). Before stretching, PVDF crystallizes into the a-form, whereas the chains of molten PBS locate at the inter-lamellar amorphous phase of PVDF. Crystal transition from a to ß of PVDF is observed in all samples during stretching. The morphological transformation from a lamellar structure into a fibrillar structure occurs at low and intermediate strains. With further deformation, a “stretching induced phase separation” phenomenon is observed. The final microstructure of PVDF/PBS blends contains PVDF microfibrils with PBS chains preferentially distributed in the inter-fibrillar region. The PBS molecular weight influences the onset and end strain for the transition. A new “two-step model” is proposed to describe the deformation process.
Publisher Polymer
Wikidata
Citation Polymer 55 (2014) 2588-2596
DOI https://doi.org/10.1016/j.polymer.2014.03.055
Tags poly(vinylidene fluoride) poly(butylene succinate) stretching induced phase separation

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