Citation: Yan-hui Chen, Hao-qing Yang, Song Yang, Qiu-yu Zhang, Zhong-ming Li. Temperature-dependent β-Crystal Growth in Isotactic Polypropylene with β-Nucleating Agent after Shear Flow[J]. Chinese Journal of Polymer Science, ;2017, 35(12): 1540-1551. doi: 10.1007/s10118-017-1990-x shu

Temperature-dependent β-Crystal Growth in Isotactic Polypropylene with β-Nucleating Agent after Shear Flow

a.
Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, Xi'an 710072, China
b.
College of Polymer Science and Engineering and State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China

Corresponding author: Yan-hui Chen, yanhuichen@nwpu.edu.cn
Received Date: 6 April 2017
Revised Date: 15 May 2017
Accepted Date: 2 June 2017

Fund Project: the National Natural Science Foundation of China 51503170the National Natural Science Foundation of China 51473135the Opening State Key Laboratory of Polymer Materials Engineering (Sichuan University) sklpme 2015-4-22the Fundamental Research Funds for the Central Universities 3102016BJY01the National Natural Science Foundation of China 21676217

In our current work, the effect of the shear temperature on the growth of β-crystal in isotactic polypropylene (iPP) with β-nucleating agent is investigated by means of in situ two-dimensional wide-angle X-ray diffraction (2D-WAXD). At low shear temperatures, the formed shear-induced oriented precursors are hard to relax back to random coiled state due to the weak mobility of molecular chains. Therefore, plenty of oriented α-crystals are induced by shear-induced oriented precursors, while β-crystal is greatly depressed. As the shear temperature increases, oriented β-crystal gradually increases along with the decrease of α-crystal. It is deduced that the shear temperature at which the content of β-crystal increases to the (maximum) value found in quiescent crystallization is almost the same as that at which the accelerating effect of flow on crystallization kinetics is completely erased. Our work manifests its significance in regulating β-crystal and thus in the structure and property manipulation of iPP.
- Isotactic polypropylene,
- β-Crystal,
- Crystallization,
- Shear temperature
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1.
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