The role of crystalline, mobile amorphous and rigid amorphous fractions in the performance of recycled poly (ethylene terephthalate) (PET)

6533b834fe1ef96bd129e068

RESEARCH PRODUCT

The role of crystalline, mobile amorphous and rigid amorphous fractions in the performance of recycled poly (ethylene terephthalate) (PET)

Sigbritt Karlsson José David Badia Emma Strömberg Amparo Ribes-greus

subject

Ethylene Solucions polimèriques Polymers and Plastics Injection moulding Differential scanning calorimetry (DSC)Crystalline fractions Mechanical properties Thermo-mechanical degradation chemistry.chemical_compound Degradation Amorphous materials Polymer blends Materials Chemistry Mechanical recycling Recycling Composite material Diethyleneglycol Poly(ethylene terephthalate) (PET)Injection molding Molar mass Mechanical feature Recycled poly(ethylene terephthalate)Microstructural changes Condensed Matter Physics Chain scission Rigid-amorphous fraction Mechanics of Materials MAQUINAS Y MOTORES TERMICOS Polymer blend Materials science Mechanical performance Viscoelasticity Ethylene Differential scanning calorimetry Segmental dynamics Infrared analysis (FT-IR)Degradation reaction Differential scanning calorimetry Injection moulding Polyethylene terephthalates Ethylene glycol Termoplàstics Crystalline materials Shorter chains Amorphous solid chemistry Glass-rubber relaxation Processing cycles Ethylene glycol

description

[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 of -OH 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. © 2011 Elsevier Ltd. All rights reserved.

year	journal	country	edition	language
2012-01-01

10.1016/j.polymdegradstab.2011.10.008 https://doi.org/10.1016/j.polymdegradstab.2011.10.008