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Title Accelerating shear-induced crystallization and enhancing crystal orientation of isotactic-polypropylene via nucleating agent self-assembly
Date 05.12.2018
Number 56032
Abstract Accelerating shear-induced crystallization and enhancing crystal orientation of isotactic-polypropylene (iPP) via controlling the morphology of N,N´-dicyclohexyl-2,6-naphthalene dicarboxamide (NJS) is reported here. By adjusting the final heating temperature, NJS crystallizes into dotlike, needlelike, and treelike morphologies. Due to the selective absorption, longer polymer chains are anchored on the surface of NJS, leading to a lower viscosity of the composite than pure iPP. Since that anchoring points will inhibit the relaxation of oriented polymer chains after shear ceases, the shear-induced crystallization kinetics of the composite is greatly accelerated compared with pure iPP. As the morphology of NJS changes from dotlike to treelike, the crystallization induction time decreases further from 620·s to 250·s. Additionally, the branches of the treelike NJS will be detached from the tree upon the shear flow and orient themselves in the shear direction, which endows a highest degree of crystal orientation of the composites with treelike NJS.
Publisher Polymer
Identifier
Citation Polymer 158 (2018) 213-222
DOI https://doi.org/10.1016/j.polymer.2018.10.066
Authors Chang, B. ; Schneider, K. ; Vogel, R. ; Luo, B. ; Zheng, G. J. ; Heinrich, G.
Tags self-assembly shear-induced crystallization nucleating agent orientation

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