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Flow Induced Crystallization of Long Chain Branched Polypropylenes Under Weak Shear Flow by Fengyuan Yu; Hongbin Zhang; Ruogu Liao; Hong Zheng; Wei Yu; Chixing Zhou is a Materials Science article available to read on EtoBox.

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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 typically 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 crystalli

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Author

Fengyuan Yu; Hongbin Zhang; Ruogu Liao; Hong Zheng; Wei Yu; Chixing Zhou

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0014-3057)

Published

2009

Language

EN

Field

Materials Science (Physical Sciences)