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Brebu, Mihai Petru Poni Institute of Macromolecular Chemistry
Bhaskar, Thallada Department of Applied Chemistry, Faculty of Engineering, Okayama University
Muto, Akinori Department of Applied Chemistry, Faculty of Engineering, Okayama University
Sakata, Yusaku Department of Applied Chemistry, Faculty of Engineering, Okayama University
A method to recover both Br and Br-free plastic from brominated flame retardant high impact polystyrene (HIPS-Br) was proposed. HIPS-Br containing 15% Br was treated in autoclave at 280℃ using water or KOH solution of various amounts and concentrations. Hydrothermal treatment (30 ml water) leads to 90% debromination of 1 g HIPS-Br but plastic is strongly degraded and could not be recovered. previous termAlkalinenext term hydrothermal treatment (45 ml or 60 ml KOH 1 M) showed similar debromination for up to 12 g HIPS-Br and plastic was recovered as pellets with molecular weight distribution close to that of the initial material. Debromination occurs at melt plastic/KOH solution interface when liquid/vapour equilibrium is attained inside autoclave (280℃ and 7 MPa in our experimental conditions) and depends on the plastic amount/KOH volume ratio. The antimony oxide synergist from HIPS-Br remains in recovered plastic during treatment. A pictorial imagination of the proposed debromination process is presented.
Digital Object Identifer: 10.1016/j.chemosphere.2006.02.036
Published with permission from the copyright holder. This is the author's copy, as published in Chemosphere, August 2006, Volume 64, Issue 6, Pages 1021-1025.
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