Investigation on multiple-melting behavior of nano-CaCO3/polypropylene composites

doi:10.1007/s11705-007-0017-5

Front. Chem. Sci. Eng.

2007, Vol. 1

Issue (1) : 81-86 https://doi.org/10.1007/s11705-007-0017-5

Investigation on multiple-melting behavior of nano-CaCO3/polypropylene composites

LIN Zhidan¹, ZENG Chunlian², MAI Kancheng²

1.Key Laboratory for Polymeric Composites and Functional Materials of Ministry of Education, Material Science Institute, College of Chemistry and Chemical Engineering, Zhongshan (Sun Yat-sen) University, Guangzhou 510275, China; College of Science and Engineering, Jinan University, Guangzhou 510632, China; 2.Key Laboratory for Polymeric Composites and Functional Materials of Ministry of Education, Material Science Institute, College of Chemistry and Chemical Engineering, Zhongshan (Sun Yat-sen) University, Guangzhou 510275, China;

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Abstract The multiple melting-peak behavior of polypropylene (PP) in nano-CaCO₃/PP composites and modified nano-CaCO₃/PP composites were investigated under the condition of isothermal crystallization and nonisothermal crystallization. The result indicated that the addition of nano-CaCO₃ markedly increased the crystallization temperatures of PP and induced the formation of the β-crystal of PP. The crystallization temperatures of nano-CaCO₃/PP composites modified by reactive monomers were further increased, but the melting-peak intensity of the β-crystal of PP was not greatly influenced. While in the presence of dicumyl peroxide, nano-CaCO₃/PP composites modified by reactive monomers led to the significant increase in the melting-peak intensity of the β-crystal of PP. The double melting-peak of PP was observed, which was attributed to the formation of two kinds of different crystallization forms of α-crystal or β-crystal during the crystallization of PP. With the increase of crystallization temperatures, the double melting-peak moved toward the high-temperature side. The intensity of high-temperature melting peak was higher than that of low-temperature melting peak in nano-CaCO₃/PP composites. While in modified nano-CaCO₃/PP composites crystallized at higher temperature, the intensity of high-temperature melting peak was lower than that of low-temperature melting peak. The isothermal crystallization time had little effect on the melting temperatures.

Issue Date: 05 March 2007

Cite this article:

ZENG Chunlian,LIN Zhidan,MAI Kancheng. Investigation on multiple-melting behavior of nano-CaCO3/polypropylene composites[J]. Front. Chem. Sci. Eng., 2007, 1(1): 81-86.

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https://academic.hep.com.cn/fcse/EN/10.1007/s11705-007-0017-5
https://academic.hep.com.cn/fcse/EN/Y2007/V1/I1/81

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