Journal
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume 40, Issue 3, Pages 369-378Publisher
WILEY
DOI: 10.1002/pola.10121
Keywords
2-(6-oxido-6H-dibenzo < c,e >< 1,2 > oxa-phosphorin-6-yl)1,4-benzenediol; bis(3-dihydroxyphenyl) phenyl phosphate; flame retardance; epoxy curing; thermal properties; TGA
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2-(6-Oxido-6H-dibenzo<1,2>oxa-phosphorin-6-yl)1,4-benzenediol (ODOPB) and bis(3-dihydroxyphenyl) phenyl phosphate (BHPP) were successfully synthesized and used as reactive flame retardants in o-cresol formaldehyde novolac epoxy resin. Because of the rigid, cyclic, side-chain structure of ODOPB, the resultant phosphorus-containing epoxy resin exhibited a higher glass-transition temperature, better flame retardancy, higher modulus, and greater thermal stability than the regular bromine-containing tetrabromobisphenol A epoxy resin and the linear, main-chain, phosphorus-containing BHPP epoxy resin. A UL-94VO rating was achieved with a phosphorus content as low as 1.1% with ODOPB (comparable to a bromine content of 12% and a phosphorus content of 2.2% with BHPP) in the cured resins, and no fumes or toxic gas emissions were observed. (C) 2001 John Wiley Sons, Inc.
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