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13X zeolite as Difunctional nucleating agent regulating the crystal form and improving the Foamability of blocked copolymerized polypropylene in supercritical CO2 foaming process

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Abstract

Comparing with solid counterpart, plastic foams exhibit many merits, such as lightweight, excellent energy absorption, good thermal insulation and sound absorption properties. Blocked copolymerized polypropylene (PPB) is a kind of foamable polymer, but it is challenging to obtain the PPB foam with high expansion ratio, uniform cell structure and good toughness. In this study, 13X zeolite was used as nucleating agent for both crystallization process and foaming process. During the crystallization process, 13X zeolite used as β-nucleating agent not only improved the crystallization behavior but also induced the β-form crystal, thereby improving the toughness of PPB. During the foaming process, 13X zeolite used as cell nucleating agent improved the foamability of PPB by increasing the content of CO2 dissolved in PPB melt due to its porous structure. The experiment results revealed that when the content of 13X zeolite was 0.5 wt%, the relative content of β-crystal (kβ), the crystallization temperature (Tc) and the impact strength of PPB were greatly increased from 0.17, 114 °C, 838.9 J/m to 0.64, 122 °C, 952.9 J/m respectively. Moreover, at that content, the expansion ratio (Rv) of PPB foam reached the maximum value of 41 times under the optimal foaming temperature and pressure.

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Acknowledgements

This work was financially supported by the Natural Science Foundation of China (Grants 21476085 and 21878089), National Key R&D Program of China (2016YFB0302201) and the Fundamental Research Funds for the Central Universities (22221818010).

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Authors and Affiliations

  1. Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, Department of Product Engineering, East China University of Science and Technology, Shanghai, 200237, People’s Republic of China

    Shicheng Zhao, Chunmeng Pan, Zhong Xin, Yu Li, Wei Qin & Shuai Zhou

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  1. Shicheng Zhao
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  2. Chunmeng Pan
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  3. Zhong Xin
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  4. Yu Li
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Correspondence to Shicheng Zhao.

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Zhao, S., Pan, C., Xin, Z. et al. 13X zeolite as Difunctional nucleating agent regulating the crystal form and improving the Foamability of blocked copolymerized polypropylene in supercritical CO2 foaming process. J Polym Res 26, 58 (2019). https://doi.org/10.1007/s10965-019-1719-3

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