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Edmonds, Neil
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article
Rubber-like materials prepared from copolymerization of tannin fatty acid conjugates and vegetable oils
Abstract
Novel bio-based rubber-like materials have been prepared from the oxidation copolymerization of tannin oleate esters and vegetable oils. The resulting copolymer materials comprise relatively rigid and soft domains derived from the tannin and oil components,respectively. The copolymer materials were prepared as solvent-cast films. Analysis revealed the reactivity and amount of vegetable oil employed had the greatest influence on copolymer crosslinking and mechanical properties. Copolymer film stiffness values ranged between 6 and 300 MPa and crosslink densities were 661 - 15800 mol/m3. Glass transition temperature(Tg)and Soxhlet insolubles(>80%)were relatively similar when forming copolymers with tung oil. In contrast,both Tg and degree of crosslinking decreased significantly with use of linseed stand oil. Thermogravimetric analysis indicated copolymers were thermally stable up to 200C.