INTEMA   05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
artículos
Título:
Aging Study of Linseed Oil Resin/Styrene Thermosets and their Composites with Wood Flour
Autor/es:
M. A. MOSIEWICKI; O. ROJAS; M.R. SIBAJA; J.BORRAJO; M.I. ARANGUREN
Revista:
POLYMER INTERNATIONAL
Editorial:
Wiley
Referencias:
Año: 2007 vol. 57 p. 875 - 881
ISSN:
0959-8103
Resumen:
Abstract: The changes in the properties of new crosslinked polymers based on renewable resources and their
derived composites have been monitored as a function of time; this knowledge being necessary to estimate their
behavior in final applications. Rigid thermoset polymers prepared by free radical polymerization of resins obtained
from linseed oil and styrene and composites reinforced with wood flour were evaluated in different environmental
conditions and at different times after their preparation. The action of atmospheric oxygen on the unsaturated
groups in fatty acids produces chemical changes in these polymers, which affect the properties of the cured
materials. These changes were analyzed using Fourier transform infrared spectroscopy, dynamic mechanical
analysis and mechanical testing. An increase in the modulus with time was observed during exposure of the
samples to dry conditions, or humid environments (60% relative humidity), with or without UV irradiation. The
reaction with oxygen appears to be accelerated when thematerials are subjected to UV irradiation, showing a large
effect on the glass transition temperature.