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Thermal properties and isothermal crystallization of syndiotactic polypropylenes: Differential scanning calorimetry and overall crystallization kinetics

2000; Wiley; Volume: 75; Issue: 1 Linguagem: Inglês

10.1002/(sici)1097-4628(20000103)75

1097-4628

Pitt Supaphol, Joseph E. Spruiell,

Polymer Nanocomposites and Properties

Journal of Applied Polymer ScienceVolume 75, Issue 1 p. 44-59 Thermal properties and isothermal crystallization of syndiotactic polypropylenes: Differential scanning calorimetry and overall crystallization kinetics Pitt Supaphol, Pitt Supaphol Center for Materials Processing and Department of Materials Science & Engineering, University of Tennessee, 434 Dougherty Engineering Building, Knoxville, Tennessee 37996-2200Search for more papers by this authorJoseph E. Spruiell, Corresponding Author Joseph E. Spruiell Center for Materials Processing and Department of Materials Science & Engineering, University of Tennessee, 434 Dougherty Engineering Building, Knoxville, Tennessee 37996-2200Center for Materials Processing and Department of Materials Science & Engineering, University of Tennessee, 434 Dougherty Engineering Building, Knoxville, Tennessee 37996-2200===Search for more papers by this author Pitt Supaphol, Pitt Supaphol Center for Materials Processing and Department of Materials Science & Engineering, University of Tennessee, 434 Dougherty Engineering Building, Knoxville, Tennessee 37996-2200Search for more papers by this authorJoseph E. Spruiell, Corresponding Author Joseph E. Spruiell Center for Materials Processing and Department of Materials Science & Engineering, University of Tennessee, 434 Dougherty Engineering Building, Knoxville, Tennessee 37996-2200Center for Materials Processing and Department of Materials Science & Engineering, University of Tennessee, 434 Dougherty Engineering Building, Knoxville, Tennessee 37996-2200===Search for more papers by this author First published: 19 November 1999 https://doi.org/10.1002/(SICI)1097-4628(20000103)75:1 3.0.CO;2-1Citations: 42Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract Isothermal crystallization and subsequent melting behavior of five samples of syndiotactic polypropylene are presented. Crystallization studies were carried out in the temperature range of 60°C to 97.5°C using a differential scanning calorimeter (DSC). Subsequent DSC scans of isothermally crystallized samples exhibited double melting endotherms. The high melting peak was concluded to be the result of the melting of crystals formed by recrystallization during the reheating process. Overall crystallization kinetics was studied based on the traditional Avrami analysis. Analysis of crystallization times based on the modified growth rate theory suggested that, within the crystallization temperature range studied, the syndiotactic polypropylenes crystallize in regime III. Kinetic crystallizability parameters also were evaluated, and were found to be in the range of 0.41°C s−1 to 2.14°C s−1. © 2000 John Wiley & Sons, Inc. 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