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Catalysis and kinetics of cyclotrimerization of cyanate ester resin systems
Author(s) -
OseiOwusu A.,
Martin G. C.,
Gotro J. T.
Publication year - 1992
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760320805
Subject(s) - cyanate ester , autocatalysis , thermal stability , cyanate , bisphenol a , kinetics , catalysis , differential scanning calorimetry , manganese , fourier transform infrared spectroscopy , thermogravimetry , materials science , cobalt , zinc , bisphenol , polymer chemistry , tetrabromobisphenol a , nuclear chemistry , inorganic chemistry , chemistry , chemical engineering , epoxy , organic chemistry , composite material , fire retardant , metallurgy , quantum mechanics , physics , thermodynamics , engineering
The kinetics of cyclotrimerization and the thermal stability of bisphenol Abased cyanate ester resin systems were determined using Fourier transform infrared spectroscopy, differential scanning calorimetry, and thermogravimetry. The bisphenol A dicyanate was cured with 4 phr nonylphenol and with the octoates of zinc and manganese, and cobalt acetylacetonate at concentrations ranging from 0 to 750 ppm metal. An empirical rate law was used to predict the cyanate concentration profiles. The observed reaction rate showed a first‐order dependenće on the initial metal concentration and a second‐order dependence on the cyanate concentration in the kinetically controlled regime. For the uncatalyzed systems, the kinetics was described by a second‐order autocatalytic model. The thermal stability of the network was found to be dependent on the catalyst concentration for the zinc catalysts. For the samples cured with manganese, no effect of concentration on the thermal stability was observed.