INVESTIGADORES
ARANGUREN mirta Ines
artículos
Título:
Curing Kinetics of Divinyl Ester resins with Styrene
Autor/es:
AUAD, MARÍA L.; ARANGUREN, MIRTA I.; GUILLERMO E. ELIÇABE; BORRAJO, JULIO
Revista:
JOURNAL OF APPLIED POLYMER SCIENCE
Editorial:
Wiley
Referencias:
Lugar: NY; Año: 1999 vol. 74 p. 1044 - 1053
ISSN:
0021-8995
Resumen:
ABSTRACT: The curing reaction of a divinyl ester resin with different proportions of
styrene4, 20, and 40% by weightwas investigated by differential scanning calorimetry
(DSC) using isothermal and dynamic modes. The different constraints on the
reaction rate was globally considered, taken the reaction as divided in two regimens:
below the vitrification regimen and during the vitrification regimen. Below the vitrifi-
cation regimen, the autocatalytic model developed by Kamal was used to perform the
analysis of the curing kinetics of divinyl ester resin with styrene. Experimental data
from dynamic and isothermic runs, at a fixed composition, were simultaneously considered,
while the actual temperature records (measured during the DSC runs) were
also taken into account. The adjusted kinetic parameters took into account the gel effect
on the radicals termination rate and the structure constraints on the reactivity of
pendant vinyls groups, present during this stage. During the vitrification stage, the
diffusion control due to the low mobility of the reactive groups and molecules was
incorporated into the overall rate constant according to the Rabinowitch model, which
considers the two regimen contributions to the overall reaction rate kinetic. The
VogelFulcher relationship was adopted to express the temperature dependence of the
rate constant during the vitrification stage. The method presented here has been
satisfactorily applied to dynamic and isothermal curing reactions, allowing a simple
and general kinetic expression useful in the design, optimization, and control of the
processing of composites based on these thermoset polymers to be obtained. © 1999 John
Wiley & Sons, Inc. J Appl Polym Sci 74: 10441053, 1999
Key words: divinyl ester resins; styrene copolymers; curing kinetics; diffusion control