Abstract
Maleic anhydride grafted polypropylene (MAPP) was incorporated into polypropylene (PP)/halloysite composites as a compatibilizer. The effect of halloysite and compatibilizer on the crystallization behavior of PP/MAPP/halloysite composites was investigated by differentical scanning calorimetry. The results indicate that Avrami crystallization theory can be used to analyze the kinetic data. As expected, the crystallinity of the composites after isothermal crystallization is higher than that after injection molding. The introduction of halloysite increases the crystallization temperature of PP by 4°C. The halloysite also promotes the nucleation and overall crystallization rate by acting as a heterogeneous nucleating agent. The incorporation of compatibilizer MAPP improves the dispersion of halloysite in the PP matrix, further facilitating the nucleation and crystallization processes. However, excess compatibilizer magnifies its negative influences on crystallization by limiting molecular mobility and diffusion and deteriorating heterogeneous nucleation. Consequently, PP/halloysite composite containing 5% compatibilizer is optimal for both the highest nucleation and overall crystallization rates.
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Bao, Z., Lee, E., Tao, J. et al. Effect of halloysite and maleic anhydride grafted polypropylene on the isothermal crystallization kinetics of polypropylene based composites. Polym. Sci. Ser. A 57, 889–897 (2015). https://doi.org/10.1134/S0965545X15060024
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DOI: https://doi.org/10.1134/S0965545X15060024