Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 78: Issue 3

The effect of chain extension on the thermal behaviour and crystallinity of reactive extruded recycled PET

Authors:
,
F. Awaja School of Aerospace Mechanical and Manufacturing Engineering RMIT University PO Box 71, Bundoora Victoria 3083 Australia

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F. Daver School of Aerospace Mechanical and Manufacturing Engineering RMIT University PO Box 71, Bundoora Victoria 3083 Australia

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E. Kosior Visy Technical Centre 23 Ash Road Prestons, NSW 2170 Australia

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F. Cser Rheology and Materials Processing Centre RMIT University GPO Box 2476V Melbourne, Victoria 3001 Australia

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Pages:
865–884
Online Publication Date:
13 Jan 2005
Publication Date:
01 Dec 2004
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-004-0454-z
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Abstract  

Recycled poly(ethylene terephthalate) (R-PET) was chain extended with pyromellitic dianhydride (PMDA) in a commercial size twin-screw reactive extrusion system. Temperature-modulated differential scanning calorimetry (TMDSC) was used to evaluate the effect of the chain extension process on the thermal transitions and crystallinity of R-PET. Reactive extruded recycled PET (RER-PET) samples were tested based on different PMDA concentration and reactive extrusion residence times. The glass transition temperature (Tg) did not show a significant change as a function of PMDA addition or the extrusion residence time. Melting temperature (Tm) and crystallisation temperature (Tc) decreased with increasing PMDA concentration and with increasing extrusion residence time. RER-PET samples showed double melting peaks, it is believed that different melting mechanism is the reason behind this phenomenon. The crystallinity of RER-PET samples is lower than that of R-PET. RER-PET samples at constant PMDA concentration showed a decrease in crystallinity with increasing extrusion residence time. Results suggest that the reactive extrusion process is more dependent on PMDA concentration rather than reactive extrusion process residence time.

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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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