Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 64: Issue 2
Thermal Expansion of Liquid Crystalline Polyesters Having Phenanthrene Moieties. Simultaneous DSC-XRD method
Authors:
H. Yoshida Tokyo Metropolitan University Department of Applied Chemistry, Graduate School of Engineering Hachiouji, Tokyo 192-0397 Japan Hachiouji, Tokyo 192-0397 Japan

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Y. Houshito Kanagawa University Department of Applied Chemistry, Faculty of Engineering Rokkakubashi, Kanagawa-Ku, Yokohama 221-8686 Japan Rokkakubashi, Kanagawa-Ku, Yokohama 221-8686 Japan

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K. Mashiko Kanagawa University Department of Applied Chemistry, Faculty of Engineering Rokkakubashi, Kanagawa-Ku, Yokohama 221-8686 Japan Rokkakubashi, Kanagawa-Ku, Yokohama 221-8686 Japan

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K. Masaka Kanagawa University Department of Applied Chemistry, Faculty of Engineering Rokkakubashi, Kanagawa-Ku, Yokohama 221-8686 Japan Rokkakubashi, Kanagawa-Ku, Yokohama 221-8686 Japan

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S. Nakamura Kanagawa University Department of Applied Chemistry, Faculty of Engineering Rokkakubashi, Kanagawa-Ku, Yokohama 221-8686 Japan Rokkakubashi, Kanagawa-Ku, Yokohama 221-8686 Japan

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Pages:
453–458
Online Publication Date:
02 Nov 2004
Publication Date:
01 May 2001
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1011501807687
Keywords:
DSC-XRD; liquid crystalline polyester; smectic phase; thermal expansion
Restricted access

Abstract  

Phase transition process of polyester from phenanthrene, poly(oxyheptamethyleneoxy-2,7-phenantrenedicarbonyl), a main chain type liquid crystalline polymer, was investigated by simultaneous DSC-XRD measurements using the synchrotron radiation facility (PF). Three exothermic DSC peaks were observed during cooling from the isotropic liquid state. These DSC peaks were assigned to the transition from the isotropic liquid to the smectic A, that from the smectic A to C, and that from the smectic C to the crystalline state, respectively, as determined by XRD profiles. The rate of transition from the smectic A to C was very slow compared with the liquid crystalline transition and the crystallization. From the DSC-XRD results, the thermal expansion along c-axis in the crystal and smectic phases are 4.110−4 and 1.410−3 nm K−1 , respectively.

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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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