Superheating effects during the melting of crystallites of syndiotactic polypropylene analysed by temperature-modulated differential scanning calorimetry

Temperature modulated differential scanning calorimetry (TMd.s.c.) was applied in a study of syndiotactic polypropylene. The crystallites melt from their lateral surfaces only and the kinetics shows up in the imaginary part c″ of the complex specific heat. Theoretical analysis predicts and experimen...

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Bibliographic Details
Published in:Polymer (Guilford) 1998-06, Vol.39 (16), p.3745-3751
Main Authors: Schawe, J.E.K., Strobl, G.R.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
polymer melting
Properties and characterization
syndiotactic polypropylene
temperature-modulated differential scanning calorimetry
Thermal and thermodynamic properties
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Summary:Temperature modulated differential scanning calorimetry (TMd.s.c.) was applied in a study of syndiotactic polypropylene. The crystallites melt from their lateral surfaces only and the kinetics shows up in the imaginary part c″ of the complex specific heat. Theoretical analysis predicts and experiments confirm that c″ increases linearly with the underlying mean heating rate and the modulation period. Furthermore, it can be shown that c″ is inversely related to the superheating effective during melting. Use of the relation yields for syndiotactic polypropylene values in agreement with direct measurements employing conventional d.s.c.
ISSN:0032-3861
1873-2291
DOI:10.1016/S0032-3861(97)10330-5