Effect of interfacial interaction on the crystallization and mechanical properties of PP/nano-CaCO3 composites modified by compatibilizers

Authors

  • Yuhai Wang,

    1. Key Laboratory of Polymeric Composites and Functional Materials, The Ministry of Education, Materials Science Institute, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, People's Republic of China
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  • Hao Shen,

    1. Key Laboratory of Polymeric Composites and Functional Materials, The Ministry of Education, Materials Science Institute, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, People's Republic of China
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  • Gu Li,

    1. Key Laboratory of Polymeric Composites and Functional Materials, The Ministry of Education, Materials Science Institute, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, People's Republic of China
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  • Kancheng Mai

    Corresponding author
    1. Key Laboratory of Polymeric Composites and Functional Materials, The Ministry of Education, Materials Science Institute, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, People's Republic of China
    • Materials Science Institute, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, People's Republic of China
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Abstract

To investigate the effect of interfacial interaction on the crystallization and mechanical properties of polypropylene (PP)/nano-CaCO3 composites, three kinds of compatibilizers [PP grafted with maleic anhydride (PP-g-MA), ethylene–octene copolymer grafted with MA (POE-g-MA), and ethylene–vinyl acetate copolymer grafted with MA (EVA-g-MA)] with the same polar groups (MA) but different backbones were used as compatibilizers to obtain various interfacial interactions among nano-CaCO3, compatibilizer, and PP. The results indicated that compatibilizers encapsulated nano-CaCO3 particles, forming a core–shell structure, and two interfaces were obtained in the compatibilized composites: interface between PP and compatibilizer and interface between compatibilizer and nano-CaCO3 particles. The crystallization and mechanical properties of PP/nano-CaCO3 composites were dependent on the interfacial interactions of these two interfaces, especially the interfacial interaction between PP and compatibilizer. The good compatibility between PP chain in PP-g-MA and PP matrix improved the dispersion of nano-CaCO3 particles, favored the nucleation effect of nano-CaCO3, increased the tensile strength and modulus, but reduced the ductility and impact strength of composites. The partial compatibility between POE in POE-g-MA and PP matrix had little effect on crystallization and mechanical properties of PP/nano-CaCO3 composites. The poor compatibility between EVA in EVA-g-MA and PP matrix retarded the nucleation effect of nano-CaCO3, and reduced the tensile strength, modulus, and impact strength. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009

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