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The role of crystalline, mobile amorphous and rigid amorphous fractions on the performance of recycled poly (ethylene terephthalate) (PET)
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik, Polymera material.ORCID-id: 0000-0002-2139-7460
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik, Polymera material.ORCID-id: 0000-0002-5394-7850
2012 (engelsk)Inngår i: Polymer degradation and stability, ISSN 0141-3910, E-ISSN 1873-2321, Vol. 97, nr 1, s. 98-107Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The action of thermo-mechanical degradation induced by mechanical recycling of poly(ethylene terephthalate) was simulated by successive injection moulding cycles. Degradation reactions provoked chain scissions and a reduction in molar mass mainly driven by the reduction of diethyleneglycol to ethylene glycol units in the flexible domain of the PET backbone, and the formation ofeOH terminated species with shorter chain length. The consequent microstructural changes were quantified taking into account a three-fraction model involving crystalline, mobile amorphous (MAF) and rigid amorphous fractions (RAF). A remarkable increase of RAF, to a detriment of MAF was observed, while the percentage of crystalline fraction remained nearly constant. A deeper analysis of the melting behaviour, the segmental dynamics around the glass-rubber relaxation, and the macroscopic mechanical performance, showed the role of each fraction leading to a loss of thermal, viscoelastic and mechanical features, particularly remarkable after the first processing cycle.

sted, utgiver, år, opplag, sider
2012. Vol. 97, nr 1, s. 98-107
Emneord [en]
Poly(ethylene terephthalate) (PET), Mechanical recycling, Differential scanning calorimetry (DSC), Infrared analysis (FT-IR), Mechanical properties
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Identifikatorer
URN: urn:nbn:se:kth:diva-81436DOI: 10.1016/j.polymdegradstab.2011.10.008ISI: 000299607100013Scopus ID: 2-s2.0-82755187494OAI: oai:DiVA.org:kth-81436DiVA, id: diva2:497477
Merknad
QC 20120227Tilgjengelig fra: 2012-02-10 Laget: 2012-02-10 Sist oppdatert: 2017-12-07bibliografisk kontrollert

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