Degradation of recycled high-impact polystyrene. Simulation by reprocessing and thermo-oxidation |
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Authors: | Francisco Vilaplana Amparo Ribes-Greus |
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Affiliation: | a Department of Fibre and Polymer Technology, School of Chemical Science and Engineering, KTH - Royal Institute of Technology, Teknikringen 56-58, SE-10044 Stockholm, Sweden b Instituto de Tecnología de Materiales (ITM), Universidad Politécnica de Valencia, Camino de Vera s/n, E-46022 Valencia, Spain |
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Abstract: | A simulation of the degradation of high-impact polystyrene (HIPS), occurring during service life and mechanical recycling, was performed by multiple processing and thermo-oxidative ageing. All samples were characterized by differential scanning calorimetry (DSC), melt mass-flow rate (MFR) measurements, tensile testing and infrared spectroscopy (FTIR). Multiple processing and thermo-oxidative ageing clearly alter the oxidative stability and the elongation at break of the materials. These changes observed at a macroscopic scale have been related to chemical alterations in the structure of HIPS. The polybutadiene phase was demonstrated to be the initiation point of the degradative processes induced by processing, service life and mechanical recycling. Thermo-oxidative degradation affects more severely the degree of degradation of the material, so it may be deduced that the changes occurring during service life of HIPS are the part of the life cycle that mostly affects its further recycling possibilities and performance in second-market applications. |
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Keywords: | Recycling Degree of degradation High-impact polystyrene Reprocessing Thermo-oxidation |
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