Highly Thermally Stable Novolac Derivatives and Their Properties in Epoxy Composites

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题名:	Highly Thermally Stable Novolac Derivatives and Their Properties in Epoxy Composites
作者:	Wu,HH;Chu,PP
贡献者:	中央大學
关键词:	FLAME-RETARDANT THERMOSETS;PHENOLIC RESINS;CURING AGENT;PHOSPHORUS;MECHANISMS;POLYMERS
日期:	2009
上传时间:	2010-06-29 19:45:47 (UTC+8)
出版者:	化學研究所
摘要:	Two diazo-coupling novolac derivative resins (carbonyl phenyl azo novolac resin and carbonyl phenol-biphenylene azo novolac resin) were used as flame retardants. The cured resins exhibited elevated glass-transition temperatures from 115 degrees C (blank) to 195 and 167 degrees C, respectively. The char yield at 800 degrees C was increased, which elaborated the effectiveness of flame retardancy with evaluated limiting oxygen indices around 36 to 40. This was mainly attributed to the increased crosslink densities and highly aromatic contents in the modified phenol novolac derivative resins, which exhibited higher thermal degradation energies. Furthermore, the more effective flame retardancy was expected because of the loss of nitrogen during combustion. Through the evaluation of the cooperative flame retardancy in the organic/inorganic hybrid with char yield and increasing limiting oxygen index percentage, the effects of the filler showed cooperative flame retardancy only with the appropriate addition and with a difference in the crosslinking densities. (C) 2009 Wiley Periodicals, Inc. J Appl Polyni Sci 113: 3782-3790, 2009
關聯:	JOURNAL OF APPLIED POLYMER SCIENCE
显示于类别:	[化學研究所] 期刊論文

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