A new approach of characterizing the hydrolytic degradation of poly(ethylene terephthalate) by MALDI-MS

Weidner, Steffen M.; Kuehn, Gerhard; Werthmann, Barbara; Schroeder, Herman; Just, U.; Borowski, R.; Decker, Renate; Schwarz, Bernd; Schmuecking, I.; Seifert, I.

doi:10.1002/(sici)1099-0518(199708)35:11<2183::aid-pola9>3.0.co;2-z

Cited by 33 publications

(35 citation statements)

References 3 publications

(5 reference statements)

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“…Matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) has become a valuable technique to study the thermal [16,17], photo-oxidative [18] thermo-oxidative [18,19], plasma-oxidative [20] and hydrolytic degradation [20,21] of PET and other polyesters at the processing temperature. Whereas these studies have elucidated important degradation mechanisms, they were not performed with samples from typical industrial polymer processing conditions during thermo-mechanical recycling.…”

Section: Introductionsupporting

confidence: 89%

“…The 1 H NMR spectra were obtained on Varian GEMINI 300 and INOVA 500 spectrometers, operating at 300.07 and 499.88 MHz for The sample preparations for MALDI-TOF MS measurements were done using an extraction method of oligomers, where the soluble faction was analyzed [19,21]. Briefly, 0.1 g of virgin or degraded PET samples were dissolved in 1 mL of TFA.…”

Section: Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

Poly (ethylene terephthalate) thermo-mechanical and thermo-oxidative degradation mechanisms

Romão

Franco

Corilo

et al. 2009

Polymer Degradation and Stability

101

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Section: Introductionsupporting

confidence: 89%

Section: Characterizationmentioning

confidence: 99%

Poly (ethylene terephthalate) thermo-mechanical and thermo-oxidative degradation mechanisms

Romão

Franco

Corilo

et al. 2009

Polymer Degradation and Stability

101

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“…The products are high purity monomers: TPA and EG. Several researchers in the literature41–45 have studied the kinetics of the hydrolytic depolymerization of PET under neutral conditions. Campanelli et al41 proposed an analytical method for the whole range of conversions and estimated the rate constants of PET hydrolysis from initial‐rate data.…”

Section: Pet Chemical‐recycling Techniquesmentioning

confidence: 99%

Chemical Recycling of Poly(ethylene terephthalate)

Karayannidis

Achilias

2007

Macro Materials & Eng

307

228

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This paper covers the recent research carried out by the authors on the chemical recycling of poly(ethylene terephthalate) (PET) taken from post‐consumer soft‐drink bottles. The chemical recycling techniques used are critically reviewed and the authors' contribution is highlighted. Hydrolysis in either an alkaline or acid environment was employed in order to recover pure terephthalic acid monomer that could be repolymerized to form the polymer again. Alkaline hydrolysis was carried out in either an aqueous NaOH solution or in a non‐aqueous solution of KOH in methyl cellosolve. A phase‐transfer catalyst was introduced in alkaline hydrolysis, in order that the reaction takes place at atmospheric pressure and in mild experimental conditions. The reaction kinetics were thoroughly investigated, both experimentally and theoretically, using a simple, yet precise, kinetic model. Moreover, glycolysis was examined as an effective way for the production of secondary value‐added materials. The glycolysated PET products (oligomers) can be used as raw materials for the production of either unsaturated polyester resins (UPR) or methacrylated oligoesters (MO). UPR can subsequently be cured with styrene in ambient temperature to produce alkyd resins used as enamel paints or coatings. MO are potential monomers that can be cured either by UV irradiation or temperature to produce formulations used as coatings for wood surfaces, paints, or other applications. Thus, recycling of PET does not only serve as a partial solution to the solid‐waste problem, but also contributes to the conservation of raw petrochemical products and energy.magnified image

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“…Despite these advantages, MALDI-TOF MS has been seldom used in the study of polymer degradation in water. For example some authors studied the hydrolytic degradation of poly (ethylene terephthalate) by MALDI-MS in water (Weidner et al, 1997). The aerobic biodegradation of poly(vinylpyrrolidone) polymer was monitored on a laboratory-scale fixed-bed bioreactor run with river water applying MALDI-TOF MS (Trimpin et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

MALDI-TOF MS Imaging evidences spatial differences in the degradation of solid polycaprolactone diol in water under aerobic and denitrifying conditions

Rivas

Ginebreda

Pérez

et al. 2016

Science of The Total Environment

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Degradation of solid polymers in the aquatic environment encompasses a variety of biotic and abiotic processes giving rise to heterogeneous patterns across the surface of the material, which cannot be investigated using conventional Matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS) that only renders an "average" picture of the sample. In that context, MALDI-TOF MS Imaging (MALDI MSI) provides a rapid and efficient tool to study 2D spatial changes occurred in the chemical composition of the polymer surface. Commercial polycaprolactone diol (average molecular weight of 1250Da) was selected as test material because it had been previously known to be amenable to biological degradation. The test oligomer probe was incubated under aerobic and denitrifying conditions using synthetic water and denitrifying mixed liquor obtained from a wastewater treatment plant respectively. After ca. seven days of exposure the mass spectra obtained by MALDI MSI showed the occurrence of chemical modifications in the sample surface. Observed heterogeneity across the probe's surface indicated significant degradation and suggested the contribution of biotic processes. The results were investigated using different image processing tools. Major changes on the oligomer surface were observed when exposed to denitrifying conditions.

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A new approach of characterizing the hydrolytic degradation of poly(ethylene terephthalate) by MALDI-MS

Cited by 33 publications

References 3 publications

Poly (ethylene terephthalate) thermo-mechanical and thermo-oxidative degradation mechanisms

Poly (ethylene terephthalate) thermo-mechanical and thermo-oxidative degradation mechanisms

Chemical Recycling of Poly(ethylene terephthalate)

MALDI-TOF MS Imaging evidences spatial differences in the degradation of solid polycaprolactone diol in water under aerobic and denitrifying conditions

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