期刊
POLYMER DEGRADATION AND STABILITY
卷 97, 期 1, 页码 98-107出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2011.10.008
关键词
Poly(ethylene terephthalate) (PET); Mechanical recycling; Differential scanning calorimetry (DSC); Infrared analysis (FT-IR); Mechanical properties
资金
- Spanish Ministry of Science and Innovation [UPOVCE-3E-013]
- Spanish Ministry for Education
- Generalitat Valenciana [ACOMP/2011/189]
- Geronimo Forteza grant
- Universitat Politecnica de Valencia (UPV, Spain) [PAID 05-09-4331]
- Royal Institute of Technology (KTH, Sweden)
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. (C) 2011 Elsevier Ltd. All rights reserved.
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