The role of crystalline, mobile amorphous and rigid amorphous fractions on the performance of recycled poly (ethylene terephthalate) (PET)
2012 (English)In: Polymer degradation and stability, ISSN 0141-3910, E-ISSN 1873-2321, Vol. 97, no 1, 98-107 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2012. Vol. 97, no 1, 98-107 p.
Poly(ethylene terephthalate) (PET), Mechanical recycling, Differential scanning calorimetry (DSC), Infrared analysis (FT-IR), Mechanical properties
IdentifiersURN: urn:nbn:se:kth:diva-81436DOI: 10.1016/j.polymdegradstab.2011.10.008ISI: 000299607100013ScopusID: 2-s2.0-82755187494OAI: oai:DiVA.org:kth-81436DiVA: diva2:497477
QC 201202272012-02-102012-02-102012-02-27Bibliographically approved