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Isothermal and nonisothermal crystallization of isotactic polypropylene/graphene oxide nanosheet nanocomposites

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Abstract

Isothermal and nonisothermal crystallization of isotactic polypropylene (iPP)/graphene oxide nanosheet (GONS) nanocomposites were investigated by differential scanning calorimetry, polarizing optical microscopy and synchrotron wide-angle X-ray diffraction. Nonisothermal crystallization measurement revealed that GONSs significantly elevated crystallization peak temperature of iPP. Nucleating activity of the nanocomposites containing 0.05 wt% and 0.1 wt% GONSs was 0.61 and 0.56, respectively, indicating strong nucleation ability of GONSs. Induction period and half crystallization time of nanocomposites was greatly reduced during isothermal crystallization process. Moreover, only 0.05 wt% and 0.1 wt% caused less temperature dependence of crystallization kinetics in a wide temperature range of 132–140 °C. A very low GONS loading provided sufficient surface area for crystallite nucleation. Polarized optical microscopy showed that nucleation density of nanocomposites was much larger than that of neat iPP, accelerating overall spherulite growth rate. Crystal structure of iPP was not affected by GONSs, confirming the α-nucleating ability of GONSs.

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Acknowledgements

This study is supported by the National Outstanding Youth Foundation of China (Grant No. 50925311), the National Natural Science of China (Grant No. 51033004), the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (Grant No. 51121001), and the Open Foundation of Top Priority Subjects, Zhejiang Province (Grant No. 20110903).

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Authors and Affiliations

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

    Jia-Zhuang Xu, Yuan-Ying Liang, Hua-Dong Huang, Gan-Ji Zhong, Jun Lei & Zhong-Ming Li

  2. Analytical and Testing Center, Sichuan University, Chengdu, 610065, China

    Chen Chen

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  1. Jia-Zhuang Xu
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  2. Yuan-Ying Liang
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  3. Hua-Dong Huang
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  4. Gan-Ji Zhong
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  5. Jun Lei
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  6. Chen Chen
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  7. Zhong-Ming Li
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Correspondence to Jun Lei or Chen Chen.

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Xu, JZ., Liang, YY., Huang, HD. et al. Isothermal and nonisothermal crystallization of isotactic polypropylene/graphene oxide nanosheet nanocomposites. J Polym Res 19, 9975 (2012). https://doi.org/10.1007/s10965-012-9975-5

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  • DOI: https://doi.org/10.1007/s10965-012-9975-5

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