Synthesis, characterization, and properties of novel epoxy resins and cyanate esters

We synthesized a novel epoxy (dopotep) and cyanate ester (dopotcy) based on a phosphorus-containing triphenol (dopotriol). The proposed structures were confirmed by IR, mass spectra, NMR spectra, and epoxy-equivalent-weight titration. The synthesized dopotep or dopotcy was copolymerized with diglycidyl ether of bisphenol A (DGEBA), 6',6-bis(3-phenyl-3,4-dihydro-2H-1,3-benzoxazineyl)methane (F-a), or dicyanate ester of bisphenol A (BADCY). Thus, copolymers based on DGEBA/dopotep/diphenylmethane (ddm), F-a/dopotep, BADCY/dopotcy, and DGEBA/dopotcy were developed. The thermal properties, dielectric properties, and flame retardancy of these copolymers were investigated. The curing kinetics of dopotep/ddm and dopotep/diamino diphenylsulfone were studied with differential scanning calorimetry. The microstructure of DGEBA/dopotcy was studied with IR. (c) 2006 Wiley Periodicals, Inc.