Effects of recycling processes on physical, mechanical and degradation properties of PET yarns

Koo, Hyun Jin; Chang, Gap Shik; Kim, Seong Hun; Hahm, Wan‐Gyu; Park, Seong Yoon

doi:10.1007/s12221-013-2083-2

Cited by 50 publications

(35 citation statements)

References 3 publications

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“…different properties compared to the original one. On the other hand, the chemical recycling turns thermoplastics into monomers or oligomers (by the addition of chemical additives and processing conditions) to be used as raw materials for the production of new polymers [10].…”

Section: Introductionmentioning

confidence: 99%

Intrinsic self-healing thermoset through covalent and hydrogen bonding interactions

Araya-Hermosilla

Lima

Raffa

et al. 2016

European Polymer Journal

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The intrinsic self-healing ability of polyketone (PK) chemically modified into furan and/or OH groups containing derivatives is presented. Polymers bearing different ratios of both functional groups were cross-linked via furan/bis-maleimide (Diels-Alder adducts) and hydrogen bonding interactions (aliphatic and aromatic OH groups). The resulting thermosets display tuneable softening points (peak of tan (δ)) from 90 to 137 °C as established by DMTA. It is found that the cross-linked system containing only furan groups shows the highest softening temperature. On the other hand, systems displaying the combination of Diels-Alder adducts and hydrogen bonding (up to 60 mol % of -OH groups) do not show any change in modulus between heating cycles (i.e. factually a quantitative recovery of the mechanical behaviour). It is believed that the novelty of these tuneable thermosets can offer significant advantages over conventional reversible covalent systems. The synergistic reinforcement of both interactions resists multiple heating/healing cycles without any loss of mechanical properties even for thermally healed broken samples

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Section: Introductionmentioning

confidence: 99%

Intrinsic self-healing thermoset through covalent and hydrogen bonding interactions

Araya-Hermosilla

Lima

Raffa

et al. 2016

European Polymer Journal

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“…Thus, thermal degradation of PET occurs. As a consequence, reduced thermal and mechanical properties of the re-processed material were the main findings of these investigations (downcycling) [66][67][68][69][70][71][72][73][74][75][76][77][78]. Hence, a repeated thermal re-processing of PETwaste finally leads to a downcycling of the material.…”

Section: Thermo-mechanical Recycling 231 Re-melting Without Additivesmentioning

confidence: 94%

Recycling of poly(ethylene terephthalate) – A review focusing on chemical methods

Geyer¹,

Lorenz²,

Kandelbauer³

2016

Express Polym. Lett.

206

120

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Abstract.Recycling of poly(ethylene terephthalate) (PET) is of crucial importance, since worldwide amounts of PETwaste increase rapidly due to its widespread applications. Hence, several methods have been developed, like energetic, material, thermo-mechanical and chemical recycling of PET. Most frequently, PET-waste is incinerated for energy recovery, used as additive in concrete composites or glycolysed to yield mixtures of monomers and undefined oligomers. While energetic and thermo-mechanical recycling entail downcycling of the material, chemical recycling requires considerable amounts of chemicals and demanding processing steps entailing toxic and ecological issues. This review provides a thorough survey of PET-recycling including energetic, material, thermo-mechanical and chemical methods. It focuses on chemical methods describing important reaction parameters and yields of obtained reaction products. While most methods yield monomers, only a few yield undefined low molecular weight oligomers for impaired applications (dispersants or plasticizers). Further, the present work presents an alternative chemical recycling method of PET in comparison to existing chemical methods.

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“…A literature survey shows that molecular weight converges to the fact that there is a decrease with increase in percentage of recycled PET, intrinsic viscosity drops due to thermal degradation, and recycled polymer viscosity decreases with the increase of COOH groups. Upasani et al (2012), Pawlak et al (2000), Lee et al (2013), and Koo et al (2013) have studied the blending of recycled PET flakes with virgin PET chips.…”

Section: Characterisation Of Recycled Polyestermentioning

confidence: 99%

Polyester Recycling—Technologies, Characterisation, and Applications

Vadicherla¹,

Saravanan²,

Muthu³

2015

Environmental Implications of Recycling and Recycled Products

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Polyester, a synthetic fibre made from petroleum, a nonrenewable resource, is widely known for its environmental impacts during its extraction and manufacturing processes. Various environmental problems surrounded with the production of virgin polyester production, namely depletion of nonrenewable resource (petroleum, as a raw material for polyester production), and requirement of large amounts of energy during the production process combined with the environmental issues caused by the disposal of polyester at the end of life, makes the recycling of polyester an important and inevitable option. Recycled polyester produced by post-consumer waste such as PET bottles are found to be very environmentally beneficial compared to virgin polyester. Many studies have revealed the same. Applications of recycled polyester fibres in the production of apparel are becoming familiar these days. This chapter is dedicated to deal with the aspects pertaining to recycled polyester textiles and it includes discussions on various recycling technologies for polyester, the process of recycling polyester (mechanical and chemical recycling), and the latest developments in the characterisation of recycled yarns and fabrics produced from recycled polyester-blended yarns. This chapter also highlights the roadmap ahead for polyester in terms of sustainability.

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Effects of recycling processes on physical, mechanical and degradation properties of PET yarns

Cited by 50 publications

References 3 publications

Intrinsic self-healing thermoset through covalent and hydrogen bonding interactions

Intrinsic self-healing thermoset through covalent and hydrogen bonding interactions

Recycling of poly(ethylene terephthalate) – A review focusing on chemical methods

Polyester Recycling—Technologies, Characterisation, and Applications

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