期刊
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
卷 52, 期 16, 页码 1071-1082出版社
WILEY-BLACKWELL
DOI: 10.1002/polb.23533
关键词
beta-alpha transformation; carbon black; polypropylene; recycling; sepiolite; solid-state drawing; structure-property relationships; wide-angle X-ray diffraction
资金
- Top Institute for Food and Nutrition, Wageningen, the Netherlands [SD-001]
- NWO
Isotactic polypropylene (i-PP) can crystallize in different crystal modifications. In this article, the effect of sepiolite (one-dimensional) and carbon black (three-dimensional) fillers on the solid-state drawability of i-PP is discussed. The crosshatched structure of thermodynamically most stable a-crystal phase in i-PP does not allow for perfect chain alignment during solid-state drawing. The beta-phase i-PP, obtained by addition of specific nucleating agents, crystallizes in a non-cross-hatched spherulitic structure and allows more easy drawing. Depending on the filler type, beta-alpha transformation takes place at different draw ratios, as was observed by in situ wide-angle X-ray diffraction measurements. It was observed that beta-nucleated i-PP has a lower yield stress and can be drawn further than i-PP crystallized in the alpha-crystal phase. If added in the right amount, both carbon black and sepiolite have a reinforcing effect on PP tapes. (C) 2014 Wiley Periodicals, Inc.
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