Polymer Degradation

Topics: Flame retardant, Fire retardant, Chemical decomposition Pages: 39 (8103 words) Published: July 17, 2010
Accepted Manuscript
Title: Kinetic studies of the Decomposition of Flame Retardant Containing High Impact Polystyrene Authors: Guido Grause, Jun Ishibashi, Tomohito Kameda, Thallada Bhaskar, Toshiaki Yoshioka PII: DOI: Reference: To appear in: S0141-3910(10)00062-5 10.1016/j.polymdegradstab.2010.02.008 PDST 5967 Polymer Degradation and Stability

Received Date: 17 December 2009 Revised Date: 2 February 2010 Accepted Date: 7 February 2010

Please cite this article as: Grause G, Ishibashi J, Kameda T, Bhaskar T, Yoshioka T. Kinetic studies of the Decomposition of Flame Retardant Containing High Impact Polystyrene, Polymer Degradation and Stability (2010), doi: 10.1016/j.polymdegradstab.2010.02.008 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

ACCEPTED MANUSCRIPT

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Kinetic studies of the Decomposition of Flame Retardant Containing High Impact Polystyrene Guido Grausea, Jun Ishibashia, Tomohito Kamedaa, Thallada Bhaskarb, Toshiaki Yoshiokaa* a

The thermal decomposition of flame retardant free high-impact polystyrene (HIPS) and four HIPS samples containing brominated flame retardants has been studied using TGA at different heating rates between 2.5 and 10 K min-1. Decabromodiphenyl ether (DPE) and decabromodibenzyl (DDB) were used as flame retardants, and two of the samples contained antimony trioxide (Sb2O3) synergist besides the brominated additives. The activation energies

compensation effect was observed and used for the identification of changes in the degradation kinetics. In a third step, the kinetic model of the reaction was determined. Both Kissinger and Ozawa showed that the HIPS degraded with an EA of 200 kJ mol-1. The choice of the flame retardant had, however, little impact on the TGA plot. The addition of a flame

mainly by power law kinetics, while the addition of a flame retardant caused the mechanism to change to a phase boundary controlled mechanism after a weight loss of 80 wt%. Keywords: Decabromo dibenzyl, Decabromo diphenylether, Antimony oxide, TGA, Kinetic triplet, Nucleation Tel./Fax: +81-22-795-7211 e-mail: yoshioka@env.che.tohoku.ac.jp(T. Yoshioka)

AC C

retardant as well as the addition of Sb2O3 reduced the EA. Fire retardant free HIPS degraded

EP

TE D

(EA) and frequency factors (k0) were calculated by the methods of Kissinger and Ozawa. A

M AN U
1

SC

Abstract

RI PT

Graduate School of Environmental Studies, Tohoku University, Aramaki Aza Aoba 6-6-11, Aoba-ku Sendai 980-8579, Japan b Bio-Fuels Division (BFD), Indian Institute of Petroleum (IIP), Council of Scientific and Industrial Research (CSIR), Dehradun 248005, India.

ACCEPTED MANUSCRIPT

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1. Introduction High-impact polystyrene (HIPS) is widely used for electrical appliances, electronic instruments and construction materials. HIPS is a composite material consisting of a PS phase and a dispersed polybutadiene (PB) phase. Polybrominated compounds and antimony trioxide (Sb2O3) are synergistic flame retardant combinations frequently added to HIPS [1]. Polybrominated flame retardants are somewhat thermally labile and release bromine radicals that quench the radical chain reactions during the combustion and flame spreading processes. The synergistic effect of Sb2O3 on the flame-quenching efficiency of organic halides is wellknown [2,3]. Sb2O3 increases the releasing rate of halogens from aromatic halides via the formation of antimony...

References: 1. Gächter R, Müller H, editor. Plastics Additives Handbook. Munich: Hanser Publishers, 1990.
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