Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 53: Issue 2
Reversible Melting of Semi-Crystalline Polymers 2. Annealing Near to the Melting Point
Authors:
F. Cser CRC for Polymers Pty. Ltd 32 Business Drive Notting Hill VIC 3168 32 Business Drive Notting Hill VIC 3168

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J. Hopewell Polymer Technology Center RMIT Melboutne VIC 3001 Australia Melboutne VIC 3001 Australia

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E. Kosior Polymer Technology Center RMIT Melboutne VIC 3001 Australia Melboutne VIC 3001 Australia

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Pages:
493–508
Online Publication Date:
02 Nov 2004
Publication Date:
01 Jul 1998
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1010145509633
Keywords:
crystallisation; fringed micelle; heat capacity; MDSC; melting; semi-crystalline polymers
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Abstract  

Annealing experiments have been carried out at a few degrees below the melting point of different polyethylenes (LDPE, LLDPE, HDPE), of polypropylene (PP) and of Nylon-6. The heat capacities decrease during the annealing, within a 2-4 min time scale, to a lower value which corresponds to the extrapolated heat capacity values obtained for the cooling cycle when the polymer is cooled from the melt. Heat capacities in the heating cycle following the cooling cycle of PP, Nylon-6 and HDPE have the same value as during the cooling section. This is not the case for LDPE and LLDPE. Exothermic total heat flow in the cooling section following the annealing indicates that the crystallisation takes place during the cooling rather than during the annealing period. The total melting enthalpy measured before and after the annealing cycle is the same. The reversing heat flow shows an excellent fit to the change of the crystallinity measured by small angle scattering of synchrotron radiation during a heating cycle at temperatures below the melting peak. A coupled thermodynamic interaction of the crystalline and the amorphous phases is concluded from this study. This kind of interaction is possible at the lateral end of polymeric chains incorporated into the crystalline phase. This is an indication of the portion of tie molecules in the system, i.e. the portion of fringed micelle type of crystalline morphology with respect to that of folded chain lamellae.

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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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