Glycolysis of poly(ethylene terephthalate) wastes in xylene

Güçlü, Gamze; ̧göz, A. Kas; Özbudak, S.; Özgümüş, Saadet; Orbay, Murat

doi:10.1002/(sici)1097-4628(19980919)69:12<2311::aid-app2>3.3.co;2-t

Cited by 103 publications

(56 citation statements)

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“…The OH values of all the OIMs were much lower than the results reported by Orbey and other researchers, in which BHET and lower oligomers were main glycolysis products 8 and based on these results, it is obvious that the glycolysis at 260-280 • C, using one equivalent of a glycol, followed by the reprecipitation by MeOH, gives higher oligomers in good yield. A detailed discussion about the molecular weight of OIM will be described below.…”

Section: Resultscontrasting

confidence: 52%

Organosoluble Oligomer Obtained by Glycolysis of Poly(ethylene terephthalate) and Its Detailed Structural Characterization by MALDI-TOF Mass Spectrometry

Mori

Maeda

Kubota

et al. 2002

Polym J

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ABSTRACT:Organosoluble oligomers were obtained by the depolymerization of poly(ethylene terephthalate) with an aliphatic glycol at 260-280• C and then characterized by 1 H NMR, gel permeation chromatography (GPC), and matrix assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF MS). The detailed analysis of their spectrum revealed that for an aliphatic primary diol, the transesterification smoothly occurred in the reaction media.KEY WORDS Poly(ethylene terephthalate) / Glycolysis / Organosoluble Oligomer / MALDI-TOF Mass Spectrometry / Poly(ethylene terephthalate), PET, is widely used for synthetic fibers and film and recently its use in the production of soft drink bottles has been dramatically increasing. The efficient utilization of waste PET resulting from its huge production is a very important issue and there has been a growing tendency to effectively recycle it. PET possessing an ester linkage is a suitable material for feedstock recycling and many methods using chemical degradation have already been reported, 1,2 along with that of mechanical recycling. The recycling methods are mainly divided into alcoholysis (methanolysis and glycolysis) and hydrolysis, and the methanolysis process which produces dimethyl terephthalate (DMT) and ethylene glycol (EG) has already been adopted in some companies. The glycolysis process has been also well studied using EG to obtain bis-hydroxyethyl terephthalate (BHET) which can be used as a substrate for PET synthesis. Partial PET glycolysis depending on the ratio between the PET and glycol, reaction time, and reaction temperature is also an important process and the process using EG as a glycol usually produces BHET and oligomers having molecular weights less than 1000, both of which are quite useful materials for the synthesis of unsaturated polyesters and polyurethanes. 3 Recently, as a new entry for the useful utilization of the glycolysis products, we have demonstrated the synthesis of a copolyester by polycondensation between the glycolysis products and copoly(succinic anhydride-ethylene oxide). 4 We have also reported as a patent that various vinyl-terminated macromonomers, which would be useful for paintings, adhesives, and so on, were synthesized from the glycolysis products. 5 For the design and synthesis of the † To whom correspondence should be addressed.

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Section: Resultscontrasting

confidence: 52%

Organosoluble Oligomer Obtained by Glycolysis of Poly(ethylene terephthalate) and Its Detailed Structural Characterization by MALDI-TOF Mass Spectrometry

Mori

Maeda

Kubota

et al. 2002

Polym J

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“…[31 -37] PET can be depolymerized by alkali [33] or by a glycol system in xylene medium to degrade PET to its monomeric units. [34] PET was reported also to be depolymerized under the effect of microwave radiation. [36,37] The obtained glycolysis products of PET are well known, for a number of decades, to be used as a starting material for the synthesis of polyurethane, saturated and unsaturated polyesters.…”

Section: Glycolysis Of Petmentioning

confidence: 99%

On the UV Curability and Mechanical Properties of Novel Binder Systems Derived from Poly(ethylene terephthalate) (PET) Waste for Solventless Magnetic Tape Manufacturing, 2. Methacrylated Oligoesters

Farahat

Nikles²

2002

Macromol. Mater. Eng.

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“…[24][25][26][27][28][29][30] PET can be depolymerized by alkali, [26] or by glycol in xylene medium to degrade PET to its monomeric units. [27] PET was reported also to be depolymerized under the effect of microwave radiation. [29,30] The obtained glycolysis products of PET are well known, for a number of decades, to be used as a starting material for the synthesis of polyurethanes, saturated and unsaturated polyesters.…”

Section: Glycolysis Of Petmentioning

confidence: 99%

On the UV Curability and Mechanical Properties of Novel Binder Systems Derived from Poly(ethylene terephthalate) (PET) Waste for Solventless Magnetic Tape Manufacturing, 1. Acrylated Oligoesters

Farahat

Nikles²

2001

Macromol. Mater. Eng.

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PET waste obtained from beverage bottles was depolymerized by a glycolysis reaction, using diethylene glycol (DEG) as the glycolyzing system and manganese acetate as a transesterification catalyst. The glycolysis reaction was conducted at two different molar ratios of PET : DEG, namely 1 : 2.15 and 1 : 1.03, for the sake of obtaining oligoester polyols of varying molecular weights. The hydroxyl values of the obtained oligoesters were 361 and 330 mg KOH/g. Modification of these oligoester polyols was carried out by acrylation reactions of the available hydroxyl groups by acryloyl chloride. This gave acrylated oligoesters curable under UV or electron beam irradiation. The curability of these newly synthesized acrylated oligoesters was tested by UV irradiation, in the presence of 2‐benzyl‐2‐dimethylamino‐1‐(4‐morpholinophenyl)‐1‐butanone (BDMB) as a photo initiator. This gave cured films of high mechanical properties when the acrylated oligoesters were either cured alone or as mixtures with other commercially available diacrylate/dimethacrylate monomers. The measured tensile properties were in the range of 4.62–45 MPa for maximum tensile strength and 0.074–2.0 GPa for Young's modulus.

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Glycolysis of poly(ethylene terephthalate) wastes in xylene

Cited by 103 publications

References 0 publications

Organosoluble Oligomer Obtained by Glycolysis of Poly(ethylene terephthalate) and Its Detailed Structural Characterization by MALDI-TOF Mass Spectrometry

Organosoluble Oligomer Obtained by Glycolysis of Poly(ethylene terephthalate) and Its Detailed Structural Characterization by MALDI-TOF Mass Spectrometry

On the UV Curability and Mechanical Properties of Novel Binder Systems Derived from Poly(ethylene terephthalate) (PET) Waste for Solventless Magnetic Tape Manufacturing, 2. Methacrylated Oligoesters

On the UV Curability and Mechanical Properties of Novel Binder Systems Derived from Poly(ethylene terephthalate) (PET) Waste for Solventless Magnetic Tape Manufacturing, 1. Acrylated Oligoesters

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