Abstract
Acrylonitrile–butadiene–styrene (ABS) is one of the most extensively used engineering polymers. It is necessary to study the recycling of ABS because of environmental, economic and energy reasons. In this study, an ABS resin was processed using a torque rheometer at different temperatures and for different numbers of cycles. Pyrolysis gas chromatography mass spectrometry (Py-GC/MS) was used to study the effects of the processing parameters on additives. Fourier transform infrared spectroscopy, hydrogen nuclear magnetic resonance spectroscopy, and gel permeation chromatography (GPC) were used to analyse the structural changes in the resin. GPC results showed that after processing at 290 °C using the torque rheometer, large size soluble polymeric components increased. The increase in the large size soluble polymeric components after processing at 290 °C was probably related to the crosslinking reactions in the grafted polybutadiene. Furthermore, chemical analysis of the ABS resin samples after multiple extrusion cycles in a twin-screw extruder indicated that reprocessing considerably affected the ABS resin.
Highlights
Acrylonitrile-butadiene-styrene (ABS) is one of the most successful engineering thermoplastics
Octadecanenitrile (Peak 7 at 23.62 min) and hexadecanenitrile (Peak 2 at 21.20 min) could be the decomposition products of ethylene bis(stearamide) (EBS), used as a lubricant [15]. These peaks became much larger in the spectra obtained for the samples processed at a higher temperature, suggesting that EBS could decompose when processing at higher temperatures
In the subsequent processing cycles, the molecular weights (Mw) increased to a lesser extent
Summary
Acrylonitrile-butadiene-styrene (ABS) is one of the most successful engineering thermoplastics. In this study, an ABS resin was processed using a torque rheometer at different temperatures and for different numbers of cycles. GPC results showed that after processing at 290 °C using the torque rheometer, large size soluble polymeric components increased.
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