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

被引：156

作者：

Badia, J. D. ^{[1
]}

Stromberg, E. ^{[2
]}

Karlsson, S. ^{[2
]}

Ribes-Greus, A. ^{[1
]}

机构：

[1] Univ Politecn Valencia, ITM, E-46022 Valencia, Spain

[2] KTH Royal Inst Technol, Sch Chem Sci & Engn Fibre & Polymer Technol, SE-10044 Stockholm, Sweden

来源：

POLYMER DEGRADATION AND STABILITY | 2012年 / 97卷 / 01期

关键词：

Poly(ethylene terephthalate) (PET); Mechanical recycling; Differential scanning calorimetry (DSC); Infrared analysis (FT-IR); Mechanical properties; X-RAY-SCATTERING; DIFFERENTIAL SCANNING CALORIMETRY; TRANSMISSION ELECTRON-MICROSCOPY; REFLECTION INFRARED-SPECTROSCOPY; STRAIN-INDUCED CRYSTALLIZATION; HIGH-IMPACT POLYSTYRENE; SEMICRYSTALLINE POLY(ETHYLENE-TEREPHTHALATE); MECHANICAL-PROPERTIES; POLYETHYLENE TEREPHTHALATE; MOLECULAR-WEIGHT;

D O I：

10.1016/j.polymdegradstab.2011.10.008

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

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.

引用

页码：98 / 107

页数：10

共 85 条

[1] Molecular mobility in polymers studied with thermally stimulated recovery. II. Study of the glass transition of a semicrystalline PET and comparison with DSC and DMA results [J].