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Aging study of tung oil/styrene copolymers
C. MEIORIN; M. I. ARANGUREN; M. A. MOSIEWICKI
Simposio; Simposio Argentino de Polímeros 2011; 2011
Tung oil (TO) is available as a major product from the seeds of the tung tree (Wood, 1949). It is composed mainly of a glyceride of -elaeostearic acid. This highly unsaturated, conjugated fatty acid is largely responsible for the rapid polymerization and outstanding drying properties of this oil (Kinabrew, 1952). The carbon-carbon double bonds in the tung oil are able to react with reactive monomers like styrene (St) in cationic polymerizations to obtain thermoset polymers. During the reaction not all the unsaturations in the tung oil can participate of the copolymerization and they remain free to react later in oxidative polymerizations (Mosiewicki, 2007) affecting the performance of the cured materials. Shape memory polymers are smart materials able of fixing a temporary shape and recovering their original one by the application of an external stimulus. Materials obtained from tung oil can exhibit these properties depending mainly on the polymerization conditions (Wei, 1998). The aim of this work is to study the changes in properties of new crosslinked tung oil/styrene copolymers obtained by cationic polymerization as a function of the time. The dynamic mechanical and mechanical properties as well as shape memory behavior of copolymers with different chemical composition were analyzed.