Isothermal crystallization kinetics of isotactic polypropylene with inorganic fullerene-like WS2 nanoparticles
- 作者：Mohammed Naffakh ; Zulima Martí ; n ; Carlos Marco ; Mariá ; n A. Gó ; mez ; Ignacio Jimé ; nez
- 关键词：Inorganic fullerene nanoparticles ; Isotactic polypropylene ; Nanocomposites ; Crystallization kinetics
- 刊名：Thermochimica Acta
- 出版年：2008
- 期刊代码：110_00406031
- 类别：ch
- 出版时间：10 June 2008
- 卷：472
- 期：1-2
- 页码：11-16
- 文件大小：1037 K
摘要
Nanometric-sized inorganic fullerene-like tungsten disulfide particles (IF-WS2) were used to produce new isotactic polypropylene (iPP) nanocomposites. A remarkable increase of the crystallization rate of iPP in the nanocomposites was observed by DSC and X-ray diffraction techniques using synchrotron radiation. This fact was related to the high nucleation efficiency of IF-WS2 nanoparticles on the 
-form crystals of iPP. Other parameters such as the Avrami exponent, the equilibrium melting temperature, and the fold surface free energy of crystallization of iPP chains in the nanocomposites were obtained from the calorimetric data in order to determine the effect of the nanoparticles on them. A decrease in the fold surface free energy was calculated with increasing IF-WS2 content.
-form crystals of iPP. Other parameters such as the Avrami exponent, the equilibrium melting temperature, and the fold surface free energy of crystallization of iPP chains in the nanocomposites were obtained from the calorimetric data in order to determine the effect of the nanoparticles on them. A decrease in the fold surface free energy was calculated with increasing IF-WS2 content.