Experimental study of flow-induced crystallization in the blends of isotactic polypropylene and poly(ethylene-co-octene)

Yu, Fengyuan, Zhang, Hongbin, Zheng, Hong, Yu, Wei and Zhou, Chixing (2008) Experimental study of flow-induced crystallization in the blends of isotactic polypropylene and poly(ethylene-co-octene). European Polymer Journal, 44 1: 79-86. doi:10.1016/j.eurpolymj.2007.10.022


Author Yu, Fengyuan
Zhang, Hongbin
Zheng, Hong
Yu, Wei
Zhou, Chixing
Title Experimental study of flow-induced crystallization in the blends of isotactic polypropylene and poly(ethylene-co-octene)
Journal name European Polymer Journal   Check publisher's open access policy
ISSN 0014-3057
1873-1945
Publication date 2008-01
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.eurpolymj.2007.10.022
Volume 44
Issue 1
Start page 79
End page 86
Total pages 8
Place of publication Oxford, United Kingdom
Publisher Pergamon
Collection year 2009
Language eng
Formatted abstract
The crystallization behavior of the blends of isotactic polypropylene (iPP) and poly(ethylene-co-octene) (PEOc) under quiescent condition and shear flow were studied by differential scanning calorimetry (DSC) and rheology, respectively. The DSC curves of the iPP phase in the blends showed similar crystallization exothermic peaks to that of pure iPP itself, indicating that the addition of PEOc up to a percentage of 30 in weight almost had no influence on the crystallization behavior of iPP at quiescent condition. The rheological results of isothermal flow-induced crystallization (FIC) of iPP in the blends showed that the crystallization kinetics of iPP was enhanced with the increase of shear rate, similar to that of pure iPP, but the presence of PEOc enhanced the effect of shear on the crystallization kinetics of iPP significantly in the cases of shear rates larger than 0.2 s-1, which was due to that PEOc played an important role to promote the nucleation of iPP. The rheological results also implied that the characteristic relaxation times of blends were longer than that of pure iPP during the FIC process, indicating a different relaxation mechanism which might be related to the occurrence of interface relaxation and chain relaxation of the PEOc phase in the blends
Keyword Flow induced crystallization
Shear rate
Isotactic Polypropylene
Polymer Melts
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemistry and Molecular Biosciences
 
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Created: Tue, 04 Jun 2013, 14:55:23 EST by Fengyuan Yu on behalf of School of Chemistry & Molecular Biosciences