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The spatial correlation between crystalline and amorphous orientations of isotactic polypropylene during plastic deformation: An in situ observation with FTIR imaging

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Abstract

On the basis of research method in FTIR imaging, we made a heterogeneous thin film of isotactic polypropylene (iPP) that contains a few large spherulites (∼150 μm) which are surrounded by small spherulites (∼15 μm) for tensile testing. The evolution processes of crystalline and amorphous orientations of iPP are monitored with its characteristic peaks at 998 and 973 cm−1, respectively. By introducing the correlation images, the analysis demonstrates the relationships between the orientation evolutions of crystalline and amorphous phases in a space of 250 μm × 250 μm detecting area. During the plastic deformation, crystalline orientation is higher than amorphous orientation outside the large spherulite, while that is opposite inside the region. In addition, the evolutions of crystalline and amorphous orientations almost keep a positive correlation.

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Authors and Affiliations

  1. National Synchrotron Radiation Lab and College of Nuclear Science and Technology, CAS Key Laboratory of Soft Matter Chemistry, University of Science and Technology of China, Hefei, 230009, China

    Wei Chen, Xiang-yang Li, Yan-ping Liu, Jing Li, Wei-ming Zhou, Liang Chen  (陈亮) & Liang-bin Li  (李良彬)

Authors
  1. Wei Chen
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  2. Xiang-yang Li
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  3. Yan-ping Liu
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  4. Jing Li
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  5. Wei-ming Zhou
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  6. Liang Chen  (陈亮)
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  7. Liang-bin Li  (李良彬)
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Corresponding authors

Correspondence to Liang Chen  (陈亮) or Liang-bin Li  (李良彬).

Additional information

This work was financially supported by the China Postdoctoral Science Foundation (No. 2012M521233), the Fundamental Research Funds for the Central Universities (No. WK2310000031), the National Natural Science Funds for Distinguished Young Scholar (No. 51325301) and 973 program of MOST (No. 2010CB934504).

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Chen, W., Li, Xy., Liu, Yp. et al. The spatial correlation between crystalline and amorphous orientations of isotactic polypropylene during plastic deformation: An in situ observation with FTIR imaging. Chin J Polym Sci 33, 613–620 (2015). https://doi.org/10.1007/s10118-015-1613-3

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  • DOI: https://doi.org/10.1007/s10118-015-1613-3

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