Reactive-extrusion route for the closed-loop recycling of poly(ethylene terephthalate)

Kiliaris, P; Papaspyrides, CD; Pfaendner, R

dc.contributor.author	Kiliaris, P	en
dc.contributor.author	Papaspyrides, CD	en
dc.contributor.author	Pfaendner, R	en
dc.date.accessioned	2014-03-01T01:26:58Z
dc.date.available	2014-03-01T01:26:58Z
dc.date.issued	2007	en
dc.identifier.issn	0021-8995	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18312
dc.subject	Degradation	en
dc.subject	Polyesters	en
dc.subject	Reactive extrusion	en
dc.subject	Recycling	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Catalysts	en
dc.subject.other	Degradation	en
dc.subject.other	Extrusion	en
dc.subject.other	Flow rate	en
dc.subject.other	Macromolecules	en
dc.subject.other	Molecular weight	en
dc.subject.other	Recycling	en
dc.subject.other	Thermodynamic properties	en
dc.subject.other	Critical concentration	en
dc.subject.other	Polyols	en
dc.subject.other	Pyromellitic dianhydride	en
dc.subject.other	Reactive extrusion	en
dc.subject.other	Recyclate quality	en
dc.subject.other	Polyethylene terephthalates	en
dc.subject.other	additive	en
dc.subject.other	catalyst	en
dc.subject.other	crystallinity	en
dc.subject.other	flow rate	en
dc.subject.other	molecular structure	en
dc.subject.other	molecular weight	en
dc.subject.other	polyethylene terephthalate	en
dc.subject.other	recycling	en
dc.subject.other	waste management	en
dc.title	Reactive-extrusion route for the closed-loop recycling of poly(ethylene terephthalate)	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/app.25795	en
heal.identifier.secondary	http://dx.doi.org/10.1002/app.25795	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	The effectiveness of the reactive extrusion technique was investigated for poly(ethylene terephthalate) to promote the concept of closed-loop recycling, that is, the reuse of waste material in the initial application. More specifically, a chain-extender system, consisting of pyromellitic dianhydride, polyol, and a catalyst, was employed, and its efficiency regarding the improvement of the recyclate quality was evaluated. Accordingly, rheological and thermal characterizations were performed and used as criteria of the modification induced in the polymer molecular structure during processing due to the counteracting degradation and chain-extension reactions. In particular, the molecular weight, related to intrinsic viscosity and melt flow rate measurements, of modified poly(ethylene terephthalate) samples was found to increase with the additive content. Simultaneously, a decrease in the crystallinity was observed, attributed to the branching effect of the chain extender, which restricted the ability of the macromolecules to organize in the crystal structure. Beyond a critical concentration of the additive system, the molecular weight of the treated samples started to decrease again, and this was accompanied by a small increase in the crystallinity. (c) 2007 Wiley Periodicals, Inc.	en
heal.publisher	JOHN WILEY & SONS INC	en
heal.journalName	Journal of Applied Polymer Science	en
dc.identifier.doi	10.1002/app.25795	en
dc.identifier.isi	ISI:000245141300038	en
dc.identifier.volume	104	en
dc.identifier.issue	3	en
dc.identifier.spage	1671	en
dc.identifier.epage	1678	en