NDLI: Overshoots in stress and free energy change during the flow-induced crystallization of polymeric melt in shear flow

Content Provider	Springer Nature Link
Author	Yu, Feng yuan Zhang, Hong bin Wang, Zhi gang Yu, Wei Zhoua, Chi xing
Copyright Year	2010
Abstract	The effect of pre-shear flow on the subsequent crystallization process of polymeric melt was investigated and a flow-induced crystallization (FIC) model based on the conformation tensor incorporating the pre-shear effect was proposed. The model is capable of predicting the overshoot phenomena of the stress and the flow-induced free energy change of the polymeric system at high pre-shear rates. Under the condition of flow, the increase in the activated nuclei number was contributed by the flow-induced free energy change, which showed an overwhelming effect on the nuclei formation during the pre-shear process at high shear rates. The half crystallization time (t 1/2) of polypropylene (PP) as functions of pre-shear rate and pre-shear time at different crystallization temperatures was predicted and compared with the experiment data. Both numerical and experimental results showed that t 1/2 of PP decreased dramatically when the flow started but leveled off at long times. It was found that two transformation stages in t 1/2 existed within a wide range of shear rates. For the first stage where the melting polymer experienced a relatively weak shear flow, the acceleration of crystallization kinetics was mainly contributed by the steady value of free energy change while in the second stage for high shear rates, strong overshoot in flow-induced free energy change occurred and the crystallization kinetics was thus significantly enhanced. The overshoots in stress and flow-induced free energy change reflected an important role of flow on the primary nucleation especially when the flow was strong enough.
Starting Page	657
Ending Page	666
Page Count	10
File Format	PDF
ISSN	02567679
Journal	Chinese Journal of Polymer Science
Volume Number	28
Issue Number	4
e-ISSN	14396203
Language	English
Publisher	Chinese Chemical Society and Institute of Chemistry, CAS
Publisher Date	2010-05-20
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Crystallization kinetics Half crystallization time Flow Model Conformation tensor Condensed Matter Physics Characterization and Evaluation of Materials Industrial Chemistry/Chemical Engineering Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Chemical Engineering Polymers and Plastics

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