Highly thermally stable novolac derivatives and their properties in epoxy composites

Hsin Ho Wu, Peter P. Chu

研究成果: 雜誌貢獻期刊論文同行評審

5 引文 斯高帕斯(Scopus)

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°C (blank) to 195 and 167°C, respectively. The char yield at 800°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.

原文???core.languages.en_GB???
頁(從 - 到)3782-3790
頁數9
期刊Journal of Applied Polymer Science
113
發行號6
DOIs
出版狀態已出版 - 15 9月 2009

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