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Master curve and time–temperature–transformation cure diagram of a polyfunctional epoxy acrylic resin
Author(s) -
CañameroMartínez Pedro,
de la Fuente José Luis,
FernándezGarcía Marta
Publication year - 2010
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.33127
Subject(s) - materials science , differential scanning calorimetry , curing (chemistry) , epoxy , activation energy , isothermal process , glycidyl methacrylate , vitrification , polymerization , polymer chemistry , glass transition , atom transfer radical polymerization , radical polymerization , acrylate , composite material , thermodynamics , copolymer , polymer , chemistry , medicine , andrology , physics
Abstract The curing reaction of a well‐defined glycidyl methacrylate‐ co ‐butyl acrylate statistical copolymer, prepared by atom transfer radical polymerization, and a commercial linear diamine (Jeffamine D‐230) was studied with the objectives of constructing and discussing a time–temperature–transformation isothermal curing for this system. Thermal and rheological analyses were used to obtain the gelation and vitrification times. Differential scanning calorimetry data showed a one‐to‐one relationship between the glass‐transition temperature ( T g ) and fractional conversion independent of the cure temperature. As a result, T g was used as a measurement of conversion. We obtained a kinetically controlled master curve for isothermal curing temperatures from 50 to 100°C by shifting T g versus the natural logarithm time data to a reference temperature of 80°C. We calculated the apparent activation energy by applying two different methods, gel time measurements versus shift factors, suggesting a good agreement between them. Isoconversion contours were calculated by the numerical integration of the kinetic model. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011