Isothermal crystallization kinetics of polypropylene by differential scanning calorimetry. I. Experimental conditions

Reliable isothermal crystallization kinetic studies can be achieved by differential scanning calorimetric techniques only under restricted conditions. In the case of isotactic polypropylene, our results indicate that those conditions are met in the range of 3°C below the isothermal crystallization t...

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Bibliographic Details
Published in:Journal of applied polymer science 2004-04, Vol.92 (2), p.970-978
Main Authors: Hernández-Sánchez, Fernando, del Castillo, Luis F., Vera-Graziano, Ricardo
Format: Article
Language:English
Subjects:
Applied sciences
Avrami parameters
Crystallization
differential scanning calorimetry (DSC)
Exact sciences and technology
isothermal crystallization
kinetics (polym.)
Organic polymers
Physicochemistry of polymers
Properties and characterization
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Summary:Reliable isothermal crystallization kinetic studies can be achieved by differential scanning calorimetric techniques only under restricted conditions. In the case of isotactic polypropylene, our results indicate that those conditions are met in the range of 3°C below the isothermal crystallization temperature Tc. Experimentally, it is only in this range when the complete crystallization peak can be registered by the DSC and depicted in a thermogram. Just around this temperature interval, the Avrami exponent n = 3 for bulk crystallization, whereas for any other test the isothermal temperature Tit, nonisothermal conditions prevail and the Avrami exponent deviates from the expected value. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 970–978, 2004
ISSN:0021-8995
1097-4628
DOI:10.1002/app.20033