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The thermal degradation of poly(methyl methacrylate) (PMMA) and poly(ethylene terephthalate) (PET) has been studied by non-isothermal thermogravimetry and a comparison made with isothermal studies. Several analytical methods have been applied to the analysis of the non-isothermal thermogravimetric (TG) data to elucidate the validity of the procedures adopted and to compare the results with isothermal...
The thermal degradation of two commercial poly(ethylene terephthalate) (PET) samples and two laboratory prepared polyesters, poly(ethylene isophthalate) and poly(diethylene glycol terephthalate), was studied using thermogravimetry and thermal analysis-Fourier transform infrared spectroscopy. The commercial PET samples were copolymerised with diethylene glycol and isophthalic acid groups in different...
The concentrations of diethylene glycol (DEG) and isophthalate (IPA) units present in two commercial polyesters were measured using Fourier transform infrared (FTIR) spectroscopy and by a lowering of the melting point as measured by differential scanning calorimetric (DSC) method. To carry out the FTIR spectroscopic analysis, it was necessary to synthesise poly(diethylene glycol terephthalate) and...
This paper is concerned with the thermal degradation of poly(vinyl alcohol), both in the solid and molten state. Initially, thermal degradation in the solid state was considered to be due to the elimination of hydroxyl side groups, but this process should have produced appreciable amounts of isolated and conjugated polyenes in the degradation residue and small amounts of carbonyl group were detected...
This paper is concerned with the temperature dependence of cross-linked residue formation during the thermal degradation of nylon 6,6. The relationship between non-volatile residue formation and initial hydrogen bonding in nylon 6 and nylon 6,6 was established using thermogravimetry and hotstage-Fourier Transform infrared spectroscopy.
The kinetics and mechanisms of thermal degradation of poly(methyl methacrylate) (PMMA) have been studied to demonstrate the usefulness of thermal analysis-Fourier transform infrared spectroscopy (TA-FTIR) as a qualitative and quantitative kinetic tool to study the thermal degradation of polymers. From the dependence of the rate of thermal degradation of PMMA on molecular weight at low degradation...
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