Flow induced crystallization of long chain branched polypropylenes under weak shear flow

Yu, Fengyuan, Zhang, Hongbin, Liao, Ruogu, Zheng, Hong, Yu, Wei and Zhou, Chixing (2009) Flow induced crystallization of long chain branched polypropylenes under weak shear flow. European Polymer Journal, 45 7: 2110-2118. doi:10.1016/j.eurpolymj.2009.03.011

Author Yu, Fengyuan
Zhang, Hongbin
Liao, Ruogu
Zheng, Hong
Yu, Wei
Zhou, Chixing
Title Flow induced crystallization of long chain branched polypropylenes under weak shear flow
Journal name European Polymer Journal   Check publisher's open access policy
ISSN 0014-3057
Publication date 2009-07
Year available 2009
Sub-type Article (original research)
DOI 10.1016/j.eurpolymj.2009.03.011
Volume 45
Issue 7
Start page 2110
End page 2118
Total pages 9
Place of publication Oxford, United Kingdom
Publisher Pergamon
Collection year 2010
Language eng
Formatted abstract
In the present work long chain branched polypropylene (LCB PP) polymers were prepared by linear polypropylene and multi-functional monomer through melt grafting reaction. A quantitative rheological method was adopted to analysis the structure parameters of LCB PP. The effects of chain branched level on the crystallization kinetics of PP were investigated by rheology, differential scanning calorimetry, polarized optical microscope and wide-angle X-ray diffraction. The dynamic viscoelastic properties of LCB PP showed that the increase in the chain branched level caused a typical deviation from the terminal behavior and a different distribution of the melt relaxation spectrum in the long relaxation time regime. It was found that the chain branched level had a significant effect on the flow induced crystallization (FIC) process of PP melts. The crystallization of LCB PP was more sensitive to shear flow than that of linear PP during induced period at low shear rates. This result also indicated that the longer relaxation time of the polymer chains played an important role in the nucleation of PP under shear flow fields. LCB PP with high chain branched level showed accelerated crystallization kinetics in comparison with that with low chain branched level.
Keyword Polypropylene
Long chain branching (LCB)
Flow induced crystallization
Crystallization kinetics
Electron Beam Irradiation
Molecular Weight
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, 14:44:38 EST by Fengyuan Yu on behalf of School of Chemistry & Molecular Biosciences