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Temperature-dependent β-crystal growth in isotactic polypropylene with β-nucleating agent after shear flow

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Abstract

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.

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Authors and Affiliations

  1. Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, Xi’an, 710072, China

    Yan-hui Chen  (陈妍慧), Hao-qing Yang, Song Yang & Qiu-yu Zhang

  2. College of Polymer Science and Engineering and State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, China

    Zhong-ming Li

Authors
  1. Yan-hui Chen  (陈妍慧)
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  2. Hao-qing Yang
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  3. Song Yang
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  4. Qiu-yu Zhang
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  5. Zhong-ming Li
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Corresponding author

Correspondence to Yan-hui Chen  (陈妍慧).

Additional information

This work was financially supported by the National Natural Science Foundation of China (Nos. 51473135, 51503170 and 21676217), the Opening State Key Laboratory of Polymer Materials Engineering (Sichuan University) (No. sklpme 2015-4- 22) and the Fundamental Research Funds for the Central Universities (No. 3102016BJY01).

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Chen, Yh., Yang, Hq., Yang, S. et al. Temperature-dependent β-crystal growth in isotactic polypropylene with β-nucleating agent after shear flow. Chin J Polym Sci 35, 1540–1551 (2017). https://doi.org/10.1007/s10118-017-1990-x

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  • DOI: https://doi.org/10.1007/s10118-017-1990-x

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