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New Tung oil-based shape memory copolymers
M. I. ARANGUEN; C. MEIORIN; M. A. MOSIEWICKI
Conferencia; International Conference on Bio-Based Polymers and Composites (BiPoCo 2012); 2012
The use of renewable resources to produce polymers present several advantages, such as being widely available, renewable, biodegradable and low cost. Vegetable oils constitute an interesting alternative; they are composed mainly by triglyceride molecules with several reactive sites ready for chemical modification. Tung oil (TO) is composed mainly by the glyceride of -elaeostearic acid, a highly unsaturated-conjugated acid, responsible for the fast polymerization and drying properties of this oil (1). The unsaturations in this oil can react with monomers like styrene (St) or divinilbenzene (DVB) by cationic polymerization to obtain thermoset polymers. Unreacted unsaturations remain free to later participate in oxidative polymerizations affecting the performance of the cured materials (2). 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 copolymerization of styrene and tung oil may exhibit these properties depending mainly on the polymerization conditions (3). In this work, the changes in time of the properties of St-tung oil copolymers were investigated. The dynamic mechanical and mechanical properties as well as shape memory behavior of copolymers with different chemical composition were analyzed.