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The kinetics of the uncatalyzed reaction of diphenyl methane diisocyanate and castor oil (CO)/trimethylol propane (TMP) polyol, with xylene as solvent at different temperatures, solvent concentration and NCO/OH ratios were investigated. The polyol was synthesized from castor oil and trimethylol propane (2-ethyl-2-(hydroxymethyl)-1,3-propanediol) with equivalent ratio of 1:3 via transesterification mechanism. Polyol was then characterized using FTIR spectroscopy and liquid chromatography mass spectroscopy (LCMS) under atmospheric pressure chemical ionization mode. All the reactions obeyed second order kinetics. Enthalpy changes, activation energies and entropies of activation were also calculated. Kinetic data from these reactions will facilitate modeling of these reactions in a batch reactor.
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Kaushik et al. (2008) studied this question.
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