Rheological Behavior of Isotactic Polypropylene(iPP) Melts in Supercooling State

Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (8): 1671.

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Rheological Behavior of Isotactic Polypropylene(iPP) Melts in Supercooling State

LIU Yu-Hai^1,3, LI Hui-Zhen^2,4, LIU Xi^2,5, HU Li-Ping⁵, YANG Zhan-Lan², XU Yi-Zhuang^2*, WU Jin-Guang²

1. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
2. Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China;
3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;
4. College of Chemistry and Environmental Science, Henan Normal University, Xinxiang 453007, China;
5. School of Pharmaceutical Sciences, Liaoning University of Traditional Chinese Medicine 110032, China

Received:2010-01-29 Online:2010-08-10 Published:2010-08-10
Contact: XU Yi-Zhuang. E-mail: xyz@pku.edu.cn
Supported by:
国家自然科学基金(批准号: 50673005, 50973003)和北京大学先进技术研究院培育项目资助.

Abstract

Abstract: Decreasing the processing temperature can prevent thermal degradation of polymeric material and reduce energy consumption in the manufacturing process. In this paper, capillary rheometer was used to investigate the rheological behavior of isotactic polypropylene(iPP) in supercooling states. Experimental results demonstrate that the iPP melt in supercooling state have an induction period. After the induction period, the iPP melt undergoes gelation that is manifested by rapid increasing of the shear viscosity and leads to solidification and crystallization of iPP. During the induction period, the rheological behavior of iPP melt in supercooling states are similar to the conventional iPP melt whose temperature is above the melting temperature of iPP. The length of the induction period depends on the temperature of the melt. At 160 ℃, the length of the induction period is long enough so that it is possible to produce iPP fibers by spinning supercooling melt. In the suitable process conditions, the mechanical performance, FTIR spectra and XRD patterns of the iPP fibers produced from supercooling iPP melt are similar to those of the iPP fibers prepared from high temperature iPP melt. Thus, this work suggests that it is possible to develop an energy-saving technique to manufacturing of iPP fibers.

Key words: Isotactic polypropylene(iPP), Supercooling, Melt spinning, Rheological behavior

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LIU Yu-Hai, LI Hui-Zhen, LIU Xi, HU Li-Ping, YANG Zhan-Lan, XU Yi-Zhuang, .... Rheological Behavior of Isotactic Polypropylene(iPP) Melts in Supercooling State[J]. Chem. J. Chinese Universities, 2010, 31(8): 1671.

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Rheological Behavior of Isotactic Polypropylene(iPP) Melts in Supercooling State

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