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Authors
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Chang, B. ; Schneider, K. ; Vogel, R. ; Heinrich, G.
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Title
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Influence of nucleating agent self-assembly on structural evolution of isotactic polypropylene during uniaxial stretching
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Date
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28.02.2018
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Number
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55076
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Abstract
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Dotlike, needlelike, and treelike morphologies of N,N´-dicyclohexyl-2,6-naphthalene dicarboxamide (NJS) are induced via self-assembly. Isotactic-polypropylene (iPP)/NJS composite with treelike NJS shows the highest ß-iPP relative crystallinity (Kß). During uniaxial stretching, a higher Kß could increase the number of voids. However, the size of voids is similar regardless of the NJS morphology. The ß-a phase transition takes place after void formation. During intralamellar and interlamellar slip, no obvious polymer chains orientation can be found for a-iPP. In the strain range of 0.1–0.6, the c-axis of the ß-iPP crystal tends to orient perpendicular to the stretching direction. This is caused by lamellae twisting, a unique deformation mode of ß-iPP lamellae. The lamellae twisting is proposed to be responsible for the intense voids formation of the composite with higher Kß. At a strain larger than 0.6, the drastic increase of orientation is mainly caused by the rotation of the residual fragmented lamellae and the orientation of the newly formed crystals.
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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 138 (2018) 329-342
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DOI
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https://doi.org/10.1016/j.polymer.2018.01.081
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Tags
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self-assembly isotactic-polypropylene void phase transition orientation
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