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Influence of the trimethylolpropane (TMP) concentration on the properties of novel castor oil based polyurethanes
C. MEIORIN; T. CALVO CORREAS ; M. A. MOSIEWICKI; M. I. ARANGUEN; M.A. CORCUERA; A. ECEIZA
Workshop; 5th Workshop Green Chemistry and Nanotechnologies in Polymer Chemistry, ECLIPSE Workshop, BIOPURFIL Workshop; 2014
Polyurethanes (PU) are an important class of polymers with many different character-istics ranging from rigid to soft consistency or from solid to foamed texture . Presently, polyols used in polyurethane industry are typically of petrochemical origin, but the use of more sustainable and environmentally friendly raw materials is receiving world-wide attention. In this sense, polyols derived from renewable resources like vegetable oils is one of the alternatives most frequently considered. The first prepared vegetable oil-based PUs were obtained by reacting diisocyanates with castor oil, which has ricinoleic acid as its major constituent (about 90%) and consequent-ly it naturally carries hydroxyl groups in its structure . The aim of this work was to synthesize bio-based PU derived from castor oil (Lupranol Balance 50, BASF) and methylene diphenyl diisocyanate (MDI). The structure of the PU were varied by means of the addition of trimethylolpropane (TMP) as crosslinking agent. The synthesis was carried out in bulk and without catalyst via one-step polymerization varying the Polyol/MDI/TMP ratio. The effect of the different compositions in the polyurethanes properties were studied.