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Authors Chang, B. ; Schneider, K. ; Heinrich, G. ; Li, Y. ; Zheng, G. J. ; Häußler, L. ; Liu, C. ; Shen, C. Y.
Title Competition effect of shear-induced nuclei and multiwalled carbon nanotubes (MWCNT) on ß-isotactic polypropylene (iPP) formation in preshear injection-molded iPP/MWCNT nanocomposites
Date 01.05.2018
Number 54274
Abstract In this study, the influence of multiwalled carbon nanotubes (MWCNT) on ß-isotactic polypropylene (iPP) formation in preshear injection-molded iPP/MWCNT nanocomposites is investigated layer by layer by wide angle X-ray diffraction (WAXD). WAXD results suggest that in preshear injection-molded pure iPP, ß-iPP exists in not only the shear region, but also the core region as a result of preshear-induced nucleation. The addition of MWCNT can inhibit the ß-iPP formation. As the depth away from the specimen surface is decreased, the inhibiting effect is decreased. The reason responsible for that is given as follows: (1) with the addition of MWCNT, extra nuclei are induced during preshear. Both MWCNT and extra nuclei serve as a-iPP nucleation point. Therefore, the formation of ß-iPP is restricted; (2) the cooling rate gradient is widely accepted to exist in the injection molded sample. A larger cooling rate at a smaller depth will give rise to a lower a-iPP crystallization onset temperature and a lower nucleation efficiency of MWCNT. Since that ß-iPP grows only in the temperature range of 105°C-140°C, the inhibiting effect of MWCNT on ß-iPP becomes weaker as the depth is decreased. POLYM. COMPOS., 00:000–000, 2017. © 2017 Society of Plastics Engineers
Publisher Polymer Composites
Wikidata
Citation Polymer Composites 39 (2018) E1149-E1158
DOI https://doi.org/10.1002/pc.24650
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