Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 57: Issue 3
Calorimetric and Dielectric Investigations of Glass Transition in Intermediate Glass-forming Liquid
Authors:
I.-S. Park University of Tsukuba Institute of Materials Science 1-1-1 Tennodai Tsukuba, Ibaraki 305-8573 Japan 1-1-1 Tennodai Tsukuba, Ibaraki 305-8573 Japan

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K. Saruta University of Tsukuba Institute of Materials Science 1-1-1 Tennodai Tsukuba, Ibaraki 305-8573 Japan 1-1-1 Tennodai Tsukuba, Ibaraki 305-8573 Japan

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S. Kojima University of Tsukuba Institute of Materials Science 1-1-1 Tennodai Tsukuba, Ibaraki 305-8573 Japan 1-1-1 Tennodai Tsukuba, Ibaraki 305-8573 Japan

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Pages:
687–693
Online Publication Date:
03 Nov 2004
Publication Date:
25 Sep 1999
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1010140730325
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Abstract  

The calorimetric glass transition and dielectric dynamics of -relaxation in propylene glycol (PG) and its five oligomers (polypropylene glycol, PPG) have been investigated by the modulated differential scanning calorimetry (MDSC) and the broadband dielectric spectroscopy. From the temperature dependence of heat capacity of PPGs, it is clarified that the glass transition temperature (Tg) and the glass transition region are affected by the heating rate. The kinetic changes of PG and PPGs near Tg strongly depend on the underlying heating rate. With increasing the molecular mass of PPGs, the fragility derived from the relaxation time against temperature also increases. The PG monomer is stronger than its oligomers, PPGs, because of the larger number density of the —OH end group which tends to construct the intermolecular network structure. Adam-Gibbs (AG) theory could still hold for MDSC results due to the fact that the dielectric relaxation time can be related to the configurational entropy.

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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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