2013 Fiscal Year Final Research Report
Removal of decabromodibenzyl (DDB) from high impact polystyrene (HIPS), using a solution of NaOH in ethylene glycol (EG)
| Project/Area Number |
23510087
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Environmental technology/Environmental materials
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| Research Institution | Tohoku University |
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Principal Investigator |
GRAUSE Guido 東北大学, 環境科学研究科, 准教授 (60570017)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 高衝撃性ポリスチレン / デカブロモジフェニルエタン / 難燃剤 / ボールミル / 脱臭素 |
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| Research Abstract |
The purpose of this research was the debromination of high-impact polystyrene (HIPS) flame retarded with decabromodiphenylethane in NaOH/ethylene glycol solution.
Using a ball-mill at the most efficient reaction conditions, 190 degree celsius for 24 h at a NaOH concentration of 0.5 M, resulted in a reduction of the bromine content to 0.02% (200 mg/kg) in the residual HIPS. Although without ball-milling only about the half of the debromination was achieved, the reaction proceeded in both cases by diffusion with an activation energy of about 200 kJ/mol. Even though the most of the flame retardant remained in the HIPS causing cross-linking after debromination, phenols were observed as degradation products of the flame retardant.
The debrominated HIPS showed high thermal stability and might be reused by mechanical recycling.
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Research Products
(4 results)
