Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 59: Issue 1-2
Crystallization of Polymers Studied by Temperature Modulated Calorimetric Measurements at Different Frequencies
Authors:
C. SchickUniversity of Rostock Department of Physics Universitätsplatz 3 D-18051 Rostock Germany Universitätsplatz 3 D-18051 Rostock Germany

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M. MerzlyakovUniversity of Rostock Department of Physics Universitätsplatz 3 D-18051 Rostock Germany Universitätsplatz 3 D-18051 Rostock Germany

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A. MinakovGeneral Physics Institute Vavilov st. 38 117942 Moscow Russia Vavilov st. 38 117942 Moscow Russia

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A. WurmUniversity of Rostock Department of Physics Universitätsplatz 3 D-18051 Rostock Germany Universitätsplatz 3 D-18051 Rostock Germany

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Pages:
279–288
Online Publication Date:
02 Nov 2004
Publication Date:
25 Jan 2000
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1010108617592
Keywords:
AC calorimetry; crystallization; PCL; polymer; temperature modulation; TMDSC
Restricted access

Abstract  

Quasi-isothermal temperature modulated DSC (TMDSC) were performed during crystallization to determine heat capacity as function of time and frequency. Non-reversible and reversible phenomena in the crystallization region of polymers were distinguished. TMDSC yields new information about the dynamics of local processes at the surface of polymer crystals, like reversible melting. The fraction of material involved in reversible melting, which is established during main crystallization, keeps constant during secondary crystallization for polycaprolactone (PCL). This shows that also after long crystallization times the surfaces of the individual crystallites are in equilibrium with the surrounding melt. Simply speaking, polymer crystals are living crystals. A strong frequency dependence of complex heat capacity can be observed during and after crystallization of polymers.

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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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