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Transcrystallization in nanofiber bundle/isotactic polypropylene composites: effect of matrix molecular weight

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Abstract

Polyamide 66 (PA 66) nanofiber bundles were first electrospun and then introduced into isotactic polypropylene (iPP) melts to prepare nanofiber bundle/iPP composites. To reveal the influences of matrix molecular weight (M n ) on the transcrystalline layer, three kinds of iPP with different M n were adopted. Polarized optical microscope was employed to investigate the transcrystallinity. In the presence of PA 66 nanofiber bundle, the heterogeneous nucleation distinctly happened in iPP melts. Moreover, the higher the iPP M n , the denser the nuclei. Both a decrease in matrix M n and an increase in isothermal crystallization temperature led to an increase in the induction time. The maximum temperature at which the transcrystalline layer can be optically observed increased with the increase of M n . The growth rate of transcrystallinity decreased with the increasing M n and crystallization temperature. Moreover, selective melting of the transcrystalline layers confirmed that it was merely composed of α form crystal for all composites.

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Acknowledgments

We express our great thanks to the National Science Foundation of China (50803060, 51173171, 11172271 and 11172272) and the Innovative Talent Troops Construction Projects of Henan Province (114200510018) for financial support.

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Authors and Affiliations

  1. College of Materials Science and Engineering, The Key Laboratory of Advanced Materials Processing and Mold of Ministry of Education, Zhengzhou University, Zhengzhou, People’s Republic of China

    Yanyan Liang, Shuangyang Liu, Kun Dai, Bo Wang, Chunguang Shao, Qinxing Zhang, Songjie Wang, Guoqiang Zheng, Chuntai Liu, Jingbo Chen, Changyu Shen & Qian Li

  2. The Key Laboratory of Polymer Processing Engineering, Ministry of Education, Guangzhou, People’s Republic of China

    Guoqiang Zheng & Xiangfang Peng

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  1. Yanyan Liang
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  2. Shuangyang Liu
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  4. Bo Wang
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Correspondence to Guoqiang Zheng or Chuntai Liu.

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Liang, Y., Liu, S., Dai, K. et al. Transcrystallization in nanofiber bundle/isotactic polypropylene composites: effect of matrix molecular weight. Colloid Polym Sci 290, 1157–1164 (2012). https://doi.org/10.1007/s00396-012-2626-x

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  • DOI: https://doi.org/10.1007/s00396-012-2626-x

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