Macromolecular Symposia · 2008 · 72 citations · 35 references
Natural SciencesChemistryMaterials SciencePolymer ChemistryPolymer MaterialsSpectroscopyInfrared SpectroscopyPolymer CharacterizationPolymer Physical ChemistryPolymer PhysicsPolymer ProcessingPolymer StructureActivation EnergyActivation Energy DeterminationArrhenius EquationHigh-temperature PolymersIn Situ SpectroscopyPolyethylene TerephthalatePolyethylene Terephthalate RecyclingTemperature-dependent Reaction Kinetics
Abstract Summary: In situ ATR‐FTIR (attenuated total reflection Fourier transform infrared) spectroscopy combined with a high‐pressure cell has been applied to measure IR spectra of polymers subjected to superheated or near‐critical methanol (100– 200 °C). Spectra of poly(ethylene terephthalate) (PET) have been measured under exposure to high temperature methanol using this ATR‐FTIR approach to understand at a molecular level the recycling process of PET. The evolution of the structure and the morphology of the polymer has been studied during the methanolysis. The quantity of trans PET conformer is generally used as a tracer of the crystallinity of PET. During depolymerisation of PET the evolution of crystallinity and of trans conformer appears to be different. The dependence of the rate constant on reaction temperature was correlated by Arrhenius plot, which shows activation energy of 5.8 kJ/mol.
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Anthony P. Scott, Leo Radom · The Journal of Physical Chemistry · 1996 · 6.7K citations
Natural Sciences, Chemistry, Physics +14
H. Kurokawa, Masa–aki Ohshima, Kazuo Sugiyama et al. · Polymer Degradation and Stability · 2003 · 278 citations