Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 54: Issue 2
Annealing of Polypropylene/Polyethylene Blends Near to the Melting Points in TMDSC
Authors:
F. Cser CRC for Polymers Pty. Ltd 32 Business Drive Notting Hill VIC 3168 Australia 32 Business Drive Notting Hill VIC 3168 Australia

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R. Shanks CRC for Polymers Pty. Ltd 32 Business Drive Notting Hill VIC 3168 Australia 32 Business Drive Notting Hill VIC 3168 Australia

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Pages:
637–650
Online Publication Date:
13 Dec 2004
Publication Date:
01 Nov 1998
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1010111029827
Keywords:
blends; crystallisation; TMDSC; melting; polyethylene; polypropylene; reversibility
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Abstract  

Annealing experiments have been carried out just below the melting temperature of both polyethylene (LLDPE) and polypropylene (PP) and their blends. The total melting enthalpy measured after the annealing cycle was greater by 10-15% with respect to the value having been measured before it. During the annealing period the heat capacity decreases to a lower value within the first 2-3 min. Heat capacities of PP (either in pure form or in the blends) measured during the heating cycle following the annealing cycle have the same value as during the cooling section. The heat capacities of the LLDPE in the heating cycle following the annealing were those of the preceding heating cycle. The total heat flows in the cooling section following the annealing cycle were greater than those in another cooling cycle at the same temperatures indicating that the crystallisation takes place during the cooling rather than during the annealing periods. The presence of LLDPE decreases the crystallisation temperature of PP. The presence of SEBS in the blend results in a greater crystallisation temperature than that of pure PP. The crystallisation temperature of LLDPE increases with increasing levels of PP.

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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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