Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 92: Issue 3
Quasi-isothermal measurement by TMDSC in isotactic polypropylene
Authors:
H. Kaneko Musashi Institute of Technology Department of Physics Tamadutsumi 1-28-1 Setagaya-ku, Tokyo 158-8557 Japan

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T. Osada Musashi Institute of Technology Department of Physics Tamadutsumi 1-28-1 Setagaya-ku, Tokyo 158-8557 Japan

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M. Iijima Musashi Institute of Technology Department of Physics Tamadutsumi 1-28-1 Setagaya-ku, Tokyo 158-8557 Japan

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Pages:
807–811
Online Publication Date:
02 Jul 2008
Publication Date:
01 Jun 2008
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-006-7920-8
Keywords:
Debye process; excess heat capacity; isotactic polypropylene; quasi-isothermal TMDSC
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Abstract  

We measure the frequency dependences of complex heat flows for isothermally crystallized isotactic polypropylene (iPP) by the quasi-isothermal TMDSC. Regarding the quasi-isothermal melting processes as a kind of the single relaxation process, we analyze them by the Debye model. The resultant heat capacity of iPP is larger (about 11%) than usual thermodynamic heat capacity. We also found that the excess of the heat capacity, Cp (excess), has non-monotonous temperature dependence. A simple model introducing some kinetic modes into amorphous producing after and during temperature modulation can reproduce the temperature dependence of Cp (excess) very well.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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