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- W2028651885 abstract "The influence of nonquiescent relaxation of isotactic polypropylene on flow-induced crystallization (FIC) is investigated by a combination of particle tracking velocimeter (PTV) with a cone-plate shearing geometry and synchrotron radiation microbeam wide-angle X-ray diffraction (SR-μWAXD), which is aimed to correlate real flow profile and distribution of crystal orientation. With PTV technique, we observed that flow remains homogeneous during shear, while postshear movement and delayed fracture take place after a step strain when large shear rates and strains were imposed. Delayed fracture slices samples into several layers which move either forward or backward after the cessation of shear imposed externally. SR-μWAXD measurements reveal that the layers moving forward keep high crystal orientations while the layers moving backward show low orientations, which gives an inhomogeneous distribution of crystal orientation across the thickness of sheared samples. The correlation between moving direction and crystal orientation indicates that delayed fracture stems from the interplay between inertia and elastic retraction. The nonquiescent and inhomogeneous chain relaxation due to delayed fracture affects FIC nonuniformly and introduces complication to correlate crystallization behavior with apparent flow parameters." @default.
- W2028651885 created "2016-06-24" @default.
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- W2028651885 date "2013-09-01" @default.
- W2028651885 modified "2023-10-14" @default.
- W2028651885 title "The influence of inertia and elastic retraction on flow-induced crystallization of isotactic polypropylene" @default.
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- W2028651885 doi "https://doi.org/10.1122/1.4812671" @default.
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