Modification of Waste Poly(Ethylene Terephthalate) (PET) by Using Poly(L-Lactic Acid) (PLA) and Hydrolytic Stability

Acar, Işıl; Kaşgöz, Ahmet; Özgümüş, Saadet; Orbay, Murat

doi:10.1080/03602550600553267

Cited by 44 publications

(24 citation statements)

References 25 publications

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“…The durability of PET may create a serious environmental problem when PET products are discarded. The encouragement of PET waste recycling is due to its easy sorting, collection, and recovery from municipal solid wastes . A sufficient supply of recycled PET (rPET) resin (mainly from bottles) has attracted investment for its mechanical recycling, because this is a straightforward and convenient method with a lower toxicity than chemical recycling and so not only reduces the amount of PET waste going into landfills but also supports the conservation of raw petrochemical products and energy .…”

Section: Introductionmentioning

confidence: 99%

Effects of poly(butylene adipate‐co‐terephthalate) and ultrafined wollastonite on the physical properties and crystallization of recycled poly(ethylene terephthalate)

Chuayjuljit

Chaiwutthinan

Raksaksri

et al. 2015

Vinyl Additive Technology

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Recycled poly(ethylene terephthalate) (rPET), obtained mainly from postconsumer bottles, was melt-mixed with either poly(butylene adipate-co-terephthalate) (PBAT) or PBAT plus ultrafine wollastonite (5 lm) at different weight ratios on a twin-screw extruder and then injection-molded. Among the five rPET/PBAT blends (10-50 wt% PBAT) evaluated, the 80/20 wt% rPET/PBAT blend exhibited the highest tensile strength and degree of crystallinity, a slight increase in the tensile strain, and a remarkable increase in the melt flow index, but a lower tensile modulus and thermal stability with respect to the neat rPET. This blend was subsequently filled with four loading levels of wollastonite (10-40 wt%), where the tensile properties (modulus, strain at break, and strength) and thermal stability of the blend were all improved by the addition of wollastonite in a dose-dependent manner. Based on differential scanning calorimetry analysis, the crystallinity of rPET in the rPET/PBAT/wollastonite composites decreased in the presence of wollastonite, accompanied with a noticeable increase in the glass transition, cold crystallization, and crystallization temperatures, but only a slight change in the melting temperature was noted compared with those of the neat 80/20 wt% blend. Moreover, the addition of wollastonite at 30 wt% or higher showed a strong reduction in the melt dripping of the composites during combustion. J. VINYL ADDIT. TECHNOL., 00:000-000, 2015.

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Section: Introductionmentioning

confidence: 99%

Effects of poly(butylene adipate‐co‐terephthalate) and ultrafined wollastonite on the physical properties and crystallization of recycled poly(ethylene terephthalate)

Chuayjuljit

Chaiwutthinan

Raksaksri

et al. 2015

Vinyl Additive Technology

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“…Besides, biodegradable product synthesis from waste PET was aimed as an alternative method against chemical recycling. For this purpose, waste PET was reacted with biodegradable compounds such as poly(lactic acid) . Then crystallization and thermal oxidative degradation kinetics of these modified products were investigated .…”

Section: Introductionmentioning

confidence: 99%

The effect of xylene as aromatic solvent to aminoglycolysis of post consumer PET bottles

Acar

Bal

Güçlü

2013

Polymer Engineering & Sci

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This study deals with the use of ethylene glycol and diethylamine for the aminoglycolytic degradation of waste poly(ethylene terephthalate) (PET). Our aim is to investigate how the product composition changes according to depolymerization conditions and to obtain oligomer mixtures having different properties. For this purpose, simultaneous aminolysis–glycolysis reactions of postconsumer soft‐drink PET bottles were carried out in a high pressure reactor with or without xylene. As a result, the oligomer mixtures having carboxyl, hydroxyl, and amine end groups were obtained at the end of the aminoglycolysis of PET. All products were characterized by acid value, hydroxyl value, and amine value determinations as well as by Fourier Transform Infrared Spectroscopy and Differential Scanning Calorimeter. Use of xylene has provided initially easily mixable low viscosity dispersions and depolymerization reactions proceeded more easily. It also provided water soluble and lower molecular weight oligomers with deep depolymerization of PET in the presence of xylene. In case of using xylene, glycolysis reaction was dominant reaction rather than aminolysis and hydrolysis. Functional oligomer mixtures obtained from degradation of waste PET can be used for synthesis of coating materials, such as water reducible alkyd resins and epoxy resins. POLYM. ENG. SCI., 53:2429–2438, 2013. © 2013 Society of Plastics Engineers

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“…Aliphatic polyester‐ co ‐PET multiblock copolyesters have been synthesized, such as poly(ethylene adipate‐ co ‐ethylene terephthalate) (PEA‐PET),25 poly( ε ‐caprolactone‐ co ‐ethylene terephthalate) (PCL‐PET),26 and poly(butylene succinate‐ co ‐ethylene terephthalate) (PBS‐PET) 1. Up to now, there have been some investigations on the preparation of PET‐PLA copolymer by polycondensation reaction 27–32. Zhao et al27 synthesized relatively lower molecular weight of poly(ethylene terephthalate‐ co ‐sebacate) (PETS) and then used it as a macromonomer to initiate ring‐opening polymerization of L ‐lactide to obtain poly( L ‐lactic acid)‐ b ‐poly(ethylene terephthalate‐ co ‐sebacate)‐ b ‐poly( L ‐lactic acid) (PLLA‐PETS‐PLLA) triblock polyester.…”

Section: Introductionmentioning

confidence: 99%

“…Zhao et al27 synthesized relatively lower molecular weight of poly(ethylene terephthalate‐ co ‐sebacate) (PETS) and then used it as a macromonomer to initiate ring‐opening polymerization of L ‐lactide to obtain poly( L ‐lactic acid)‐ b ‐poly(ethylene terephthalate‐ co ‐sebacate)‐ b ‐poly( L ‐lactic acid) (PLLA‐PETS‐PLLA) triblock polyester. The chemical modification reaction of waste PET by low‐molecular‐weight PLA was carried out in solution by Acar et al28–30 Olewnik et al31, 32 synthesized PET‐PLLA copolyesters by the reaction of bis‐(2‐hydroxyethyl terephthalate) (BHET) with L ‐lactic acid oligomers (OLLA) in the presence of catalyst. The hydrolytic degradation of the copolymers was also investigated and it was claimed that they could become potential biodegradable plastics.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of high‐molecular‐weight aliphatic–aromatic copolyesters from poly(ethylene‐co‐1,6‐hexene terephthalate) and poly(L‐lactic acid) by chain extension

Wen-da

Zeng

et al. 2009

J. Polym. Sci. A Polym. Chem.

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A series of aliphatic–aromatic multiblock copolyesters consisting of poly(ethylene‐co‐1,6‐hexene terephthalate) (PEHT) and poly(L‐lactic acid) (PLLA) were synthesized successfully by chain‐extension reaction of dihydroxyl terminated PEHT‐OH prepolymer and dihydroxyl terminated PLLA‐OH prepolymer using toluene‐2,4‐diisoyanate as a chain extender. PEHT‐OH prepolymers were prepared by two step reactions using dimethyl terephthalate, ethylene glycol, and 1,6‐hexanediol as raw materials. PLLA‐OH prepolymers were prepared by direct polycondensation of L‐lactic acid in the presence of 1,4‐butanediol. The chemical structures, the molecular weights and the thermal properties of PEHT‐OH, PLLA‐OH prepolymers, and PEHT‐PLLA copolymers were characterized by FTIR, 1H NMR, GPC, TG, and DSC. This synthetic method has been proved to be very efficient for the synthesis of high‐molecular‐weight copolyesters (say, higher than Mw = 3 × 105 g/mol). Only one glass transition temperature was found in the DSC curves of PEHT‐PLLA copolymers, indicating that the PLLA and PEHT segments had good miscibility. TG curves showed that all the copolyesters had good thermal stabilities. The resulting novel aromatic–aliphatic copolyesters are expected to find a potential application in the area of biodegradable polymer materials. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 5898–5907, 2009

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Modification of Waste Poly(Ethylene Terephthalate) (PET) by Using Poly(L-Lactic Acid) (PLA) and Hydrolytic Stability

Cited by 44 publications

References 25 publications

Effects of poly(butylene adipate‐co‐terephthalate) and ultrafined wollastonite on the physical properties and crystallization of recycled poly(ethylene terephthalate)

Effects of poly(butylene adipate‐co‐terephthalate) and ultrafined wollastonite on the physical properties and crystallization of recycled poly(ethylene terephthalate)

The effect of xylene as aromatic solvent to aminoglycolysis of post consumer PET bottles

Synthesis of high‐molecular‐weight aliphatic–aromatic copolyesters from poly(ethylene‐co‐1,6‐hexene terephthalate) and poly(L‐lactic acid) by chain extension

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