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Effects Of High Molecular Weight Species On Shear-induced Orientation And Crystallization Of Isotactic Polypropylene

R. Somani, L. Yang, B. Hsiao
Published 2006 · Materials Science

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Abstract In situ rheo-SAXS (small-angle X-ray scattering) and—rheo-WAXD (wide-angle X-ray diffraction) techniques were used to investigate the role of high molecular weight species on the evolution of oriented microstructure in isotactic polypropylene (iPP) melt under shear flow. The two iPP samples, designated as PP-A and PP-B, respectively, had the same number-average (Mn) but different weight-average (Mw) and Z-average (Mz) molecular weights. Molecular weight distribution (MWD) of PP-A and PP-B was such that for MW
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