INTEMA   05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Effect of oxidative aging on the free volume in vegetable oil based networks
Autor/es:
C. MACCHI; ARANGUREN, M. I.; SEBASTIÁN ANBINDER; SOMOZA, ALBERTO; MEIORIN, C; M. A. MOSIEWICKI
Lugar:
Buenos Aires
Reunión:
Simposio; XIII Simposio Argentino de Polimeros; 2019
Resumen:
Vegetable oil-based thermoset polymers have been investigated as an alternative to the production of synthetic networks (Li, 2003). The resulting bio-based materials have shown to present competitive properties depending on the proportion of the monomers selected. One remarkable characteristic of these materials is that they can suffer chemical aging. In the case of tung oil, this effect arises when some double bonds remain unreacted after the polymerization reaction has reached the final conversion (Meiorin, 2012). Aging process involves the formation of peroxides, acids and/or radicals which can eventually produce a crosslinking process. It was reported that in tung oil (TO)-styrene (St) copolymers with different TO:St weight ratios, aging affects the glass transition temperature of the materials, as well as their mechanical and dynamic mechanical properties (Macchi, 2017).The present work was focused on the study of the formulation effect of cationically polymerized TO networks on their aging behavior. To this aim, TO networks were prepared using different comonomers or adding a modifier. The study is mainly based on the results obtained from dynamic-mechanical analysis (DMA) and positron annihilation lifetime spectroscopy (PALS).