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The effect of brominated epoxy on epoxy/phenolic reactive blends
Author(s) -
Sheinbaum L.,
Sheinbaum M.,
Weizman O.,
Dodiuk H.,
Kenig S.
Publication year - 2019
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.47172
Subject(s) - epoxy , diglycidyl ether , materials science , differential scanning calorimetry , glass transition , curing (chemistry) , bisphenol a , composite material , toughness , activation energy , polymer blend , thermosetting polymer , dynamic mechanical analysis , fourier transform infrared spectroscopy , arrhenius equation , polymer chemistry , polymer , chemical engineering , chemistry , organic chemistry , copolymer , physics , thermodynamics , engineering
Innovative reactive blends containing epoxy and brominated epoxy (BE) incorporated with resole‐type phenolic were studied with the aim to elucidate the curing kinetics and the final thermomechanical characteristics of this unique system. Curing kinetics was investigated by means of the activation energy determined using differential scanning calorimetry (DSC ) at various heating rates analyzed by the Arrhenius equation. Both DSC and Fourier transform infrared revealed that bromine elimination at elevated temperatures (above 220 °C) had lowered the activation energy in the case of BE containing phenolic blends. The thermomechanical properties showed that the addition of conventional epoxy to resole decreased its thermal properties and modulus compared to neat resole. Distinctively, BE/resole blends exhibited increased glass‐transition temperature, compared to diglycidyl ether of bisphenol A/resole blends in combination with higher elongation and toughness compared to neat resole. It was concluded that BE/epoxy resin/phenolic reactive systems offer high T g , mechanical properties and toughness and hence are applicable for structural adhesives and for matrices of polymer‐fiber composites. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47172.