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The nucleation effect of self-dispersed β-nucleating agent in ethylene-propylene block copolymerized polypropylene

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Abstract

The problem of agglomeration and poor dispersion results in the low nucleation efficiency of β-nucleating agent (β-NA) in polypropylene. In this paper, a self-dispersed β-NA (Adi-Zn) was prepared in situ (IS) by adding adipic acid and zinc oxide at equimolar ratio in PPB powder during extrusion. The results showed that the nucleation efficiency of Adi-Zn (IS) was better than the direct addition of Adi-Zn. The impact strength of PPB nucleated with 0.05 wt% Adi-Zn (IS) was 25% higher than that with the same additive amount of Adi-Zn. Also, the β-crystal content (kβ value) almost reached 1. Crystallization temperature of PPB nucleated with Adi-Zn (IS) was slightly increased compared with that of Adi-Zn. The reaction mechanism of Adi-Zn (IS) was explored by Fourier transform infrared spectroscopy (FTIR). The results showed that adipic acid and zinc oxide generated zinc adipate, and zinc adipate acted as β-NA during the crystallization of PPB. By means of energy dispersive X-ray (EDX) analysis and transmission electron microscopy (TEM), the reason for the good dispersion of in situ synthetic method was confirmed, which further leads to good nucleation efficiency of Adi-Zn (IS).

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Funding

This work was supported by the National Key R&D Program of China (2016YFB0302201), National Natural Science Foundation of China (Grants 21476085 and 21606084), and the Fundamental Research Funds for the Central Universities (222201717025).

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Correspondence to Shicheng Zhao.

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Yang, Y., Zhang, W., Qin, W. et al. The nucleation effect of self-dispersed β-nucleating agent in ethylene-propylene block copolymerized polypropylene. Colloid Polym Sci 296, 1627–1633 (2018). https://doi.org/10.1007/s00396-018-4378-8

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  • DOI: https://doi.org/10.1007/s00396-018-4378-8

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