CREEP BEHAVIOR OF WOOD FLOUR COMPOSITES MADE FROM LINSEED OIL BASED POLYESTER THERMOSETS

MOSIEWICKI, MIRNA; MARCOVICH, NORMA E.; ARANGUREN, MIRTA I.

JOURNAL OF APPLIED POLYMER SCIENCE

JOHN WILEY & SONS INC

Lugar: Hoboken; Año: 2011 vol. 121 p. 2626 - 2633

0021-8995

The creep behavior of new polymers prepared by free radical polymerization of styrene-crosslinked resins obtained from linseed oil and the derived composites have been analyzed. Results of short-time flexural creep tests at different temperatures are reported. The effects of the wood flour content and temperature are discussed. The creep deformation is significantly reduced with the incorporation of wood flour (WF) due to the excellent interaction fiber/matrix. The creep strain was modeled using the creep power law and the Bürgers models. The parameters were determined from the best fitting of the experimental data using a non-linear optimization method. Although both models gave a good description of the viscelastic creep of the materials, the Bürgers model was preferred because of its ability to predict recovery. A master curve was built using the time temperature superposition principle, being the time shifts well fitted using the Arrhenius model. The differences between the long-term creep deformation predicted by the master curve with respect to the actual measurements, was attributed to the aging of the samples.