ICCAS OpenIR
OVERSHOOTS IN STRESS AND FREE ENERGY CHANGE DURING THE FLOW-INDUCED CRYSTALLIZATION OF POLYMERIC MELT IN SHEAR FLOW
Yu, Feng-yuan1; Zhang, Hong-bin1; Wang, Zhi-gang2; Yu, Wei1; Zhou, Chi-xing1
2010-07-01
Source PublicationCHINESE JOURNAL OF POLYMER SCIENCE
ISSN0256-7679
Volume28Issue:4Pages:657-666
AbstractThe 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.
KeywordCrystallization Kinetics Half Crystallization Time Flow Model Conformation Tensor
DOI10.1007/s10118-010-9174-y
Indexed BySCI
Language英语
WOS IDWOS:000279111600022
PublisherSPRINGER
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/68994
Collection中国科学院化学研究所
Corresponding AuthorZhang, Hong-bin
Affiliation1.Shanghai Jiao Tong Univ, Adv Rheol Inst, Sch Chem & Chem Technol, Shanghai 200240, Peoples R China
2.Chinese Acad Sci, Inst Chem, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Yu, Feng-yuan,Zhang, Hong-bin,Wang, Zhi-gang,et al. OVERSHOOTS IN STRESS AND FREE ENERGY CHANGE DURING THE FLOW-INDUCED CRYSTALLIZATION OF POLYMERIC MELT IN SHEAR FLOW[J]. CHINESE JOURNAL OF POLYMER SCIENCE,2010,28(4):657-666.
APA Yu, Feng-yuan,Zhang, Hong-bin,Wang, Zhi-gang,Yu, Wei,&Zhou, Chi-xing.(2010).OVERSHOOTS IN STRESS AND FREE ENERGY CHANGE DURING THE FLOW-INDUCED CRYSTALLIZATION OF POLYMERIC MELT IN SHEAR FLOW.CHINESE JOURNAL OF POLYMER SCIENCE,28(4),657-666.
MLA Yu, Feng-yuan,et al."OVERSHOOTS IN STRESS AND FREE ENERGY CHANGE DURING THE FLOW-INDUCED CRYSTALLIZATION OF POLYMERIC MELT IN SHEAR FLOW".CHINESE JOURNAL OF POLYMER SCIENCE 28.4(2010):657-666.
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