Authors
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Liu, G. ; Schneider, K. ; Zheng, L. ; Zhang, X. ; Li, C. ; Stamm, M. ; Wang, D.
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Title
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Stretching induced phase separation in poly(vinylidene fluoride)/poly(butylene succinate) blends studied by in-situ X-ray scattering
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Date
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20.05.2014
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Number
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42861
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Abstract
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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.
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Publisher
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Polymer
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Wikidata
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Citation
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Polymer 55 (2014) 2588-2596
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DOI
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https://doi.org/10.1016/j.polymer.2014.03.055
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Tags
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poly(vinylidene fluoride) poly(butylene succinate) stretching induced phase separation
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