OVERSHOOTS IN STRESS AND FREE ENERGY CHANGE DURING THE FLOW-INDUCED CRYSTALLIZATION OF POLYMERIC MELT IN SHEAR FLOW
文献类型：期刊论文
| 作者 | Yu, Feng-yuan1; Zhang, Hong-bin1; Wang, Zhi-gang2; Yu, Wei1; Zhou, Chi-xing1 |
| 刊名 | CHINESE JOURNAL OF POLYMER SCIENCE
 |
| 出版日期 | 2010-07-01 |
| 卷号 | 28期号:4页码:657-666 |
| 关键词 | Crystallization Kinetics Half Crystallization Time Flow Model Conformation Tensor |
| ISSN号 | 0256-7679 |
| DOI | 10.1007/s10118-010-9174-y |
| 英文摘要 | 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. |
| 语种 | 英语 |
| WOS记录号 | WOS:000279111600022 |
| 出版者 | SPRINGER |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/68993]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Zhang, Hong-bin |
| 作者单位 | 1.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 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：化学研究所
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