Abstract
Treatment under normal processing temperature has been carried out by kneading for different times and at different roller rotating speeds, and also by successive extrusion cycles. There is an increase in melt viscosity of PES samples after processing. A phenomenon of thickening of melt during processing of PES may occur due to prolonged shear, heat, and oxidation under normal processing temperature (315°–335°C). A systematic study was conducted to investigate the structure changes during processing of PES by a variety of techniques including: Fourier–transform infrared spectroscopy, 13C nuclear magnetic resonance, and x-ray photoelectron spectroscopy. The results indicate that chain scission reactions occur and that long-chain branches are formed due to shear and heating. A branching mechanism provoking increase in molecular weight and thickening of melt during processing of PES is presented based on experimental data.
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