期刊
THERMOCHIMICA ACTA
卷 498, 期 1-2, 页码 92-99出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.tca.2009.10.007
关键词
Flame retardancy; PC/ABS; Aryl phosphate; Zinc borate; Flammability
资金
- Bayer MaterialScience AG
Bisphenol A polycarbonate/acrylonitrile-butadiene-styrene (PC/ABS) with and without bisphenol A bis(diphenyl phosphate) (BDP) and 5 wt.% zinc borate (Znb) were investigated. The pyrolysis was studied by thermogravimetry (TG), TG-FTIR and NMR, the fire behaviour with a cone calorimeter applying different heat fluxes, LOI and UL 94. Fire residues were examined with NMR. BDP affects the decomposition of PC/ABS and acts as a flame retardant in the gas and condensed phases. The addition of Znb results in an additional hydrolysis of PC. The fire behaviour is similar to PC/ABS, aside from a slightly increased LOI and a reduced peak heat release rate, both caused by borates improving the barrier properties of the char. In PC/ABS+BDP+Znb, the addition of Znb yields a borate network and amorphous phosphates. Znb also reacts with BDP to form alpha-zinc phosphate and borophosphates that suppress the original flame retardancy mechanisms of BDP. The inorganic-organic residue formed provides more effective flame retardancy, in particular at low irradiation in the cone calorimeter, and a clear synergy in LOI, whereas for more developed fires BDP+Znb become less effective than BDP in PC/ABS with respect to the total heat evolved. (C) 2009 Elsevier B.V. All rights reserved.
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