Journal of Thermal Analysis and Calorimetry

, Volume 112, Issue 2, pp 901–911 | Cite as

Non-isothermal crystallization kinetics of β-nucleated isotactic polypropylene

Article
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Abstract

Isotactic polypropylenes (iPP) samples were incorporated with two β-nucleating agents (NT-A and NT-C), respectively, and their non-isothermal crystallization and subsequent melt behaviors were investigated by means of differential scanning calorimeter. Jeziorny, Ozawa, and Mo methods were used to analyze non-isothermal crystallization kinetics of pure iPP and β-nucleated iPP samples. The activation energies (ΔE) of non-isothermal crystallization were calculated by Kissinger method. And the nucleation activities were calculated according to the Dobreva method. It is found that the crystallization temperature decreases and the crystallization rate increases with increasing cooling rate. The crystallization temperature and crystallization rate of nucleated iPP are higher than those of pure iPP. The order of ΔE is NT-A/iPP > pure iPP > NT-C/iPP. NT-C is more efficient than NT-A as a β-nucleating agent. But the non-isothermal crystallization kinetics of α- and β-phases cannot be determined separately. The present results should be considered with caution.

Keywords

Isotactic polypropylene β-Nucleating agent Non-isothermal crystallization kinetics Activation energy Nucleation activity 
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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2012

Authors and Affiliations

  1. 1.College of Materials Science and EngineeringNanjing University of TechnologyNanjingChina

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