Authors Chen, J. ; Schneider, K. ; Kretzschmar, B. ; Heinrich, G.
Title Nucleation and growth behavior of ß-nucleated iPP during shear induced crystallization investigated by in-situ synchrotron WAXS and SAXS
Date 09.10.2014
Abstract Polymer crystallization under flow was investigated because final properties of polymers strongly depend on the crystalline structure and morphology formed during processing. In-situ synchrotron WAXS and SAXS were used to investigate the structure formation and morphological developments during quiescent and shear-induced crystallization of iPP with 3 different concentrations (0.01, 0.03 and 0.1 wt%) of ß-nucleating agent. Under quiescent conditions, a high ß-content was obtained at all those concentrations indicating the high ß-nucleating efficiency of the nucleating agent. After application of shear, the ß-nucleating ability at small concentration was retained, while at larger concentrations it was strongly retarded. Furthermore, the addition of ß-nucleating agent was beneficial for the molecular alignment during processing, the anisotropic particles of ß-nucleating agent were much more effective to align the molecular chains in the flow direction compared to isotropic ones. A crystallization scheme for the iPP ß-nucleating agent under shear was proposed.
Journal Polymer 55 (2014) 5477-5487

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