Investigation on multiple-melting behavior of nano-CaCO3/polypropylene composites
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;
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.
出版日期: 2007-03-05
引用本文:
. Investigation on multiple-melting behavior of nano-CaCO3/polypropylene composites[J]. Frontiers of Chemical Engineering in China, 2007, 1(1): 81-86.
LIN Zhidan, ZENG Chunlian, MAI Kancheng. Investigation on multiple-melting behavior of nano-CaCO3/polypropylene composites. Front. Chem. Sci. Eng., 2007, 1(1): 81-86.
