Kinetics and Thermodynamics Study of Hexamethylene Diisocyanate and Hydroxyethyl Acrylate Reaction
This study investigates the kinetics and thermodynamic characteristics of the reaction between hexamethylene diisocyanate(HDI)and hydroxyethyl acrylate(HEA)in polyurethane synthesis.In terms of reaction kinetics,the reaction conversion rate data were obtained using the toluene-di-n-butylamine titration method,and both a second-order kinetic model and a Sato kinetic model were constructed to fit the experimental data.The results indicate that the reaction complies with the Van't Hoff approximation rule;the second-order kinetic model performs well at low conversion rates,while the Sato kinetic model exhibits better fitting advantages at high conversion rates due to the presence of autocatalysis.Regarding thermodynamics,adiabatic reaction calorimetry(ARC)was employed to characterize the reaction heat release,revealing a thermodynamic reaction order of 0.8 and an apparent activation energy of 57.51 kJ/mol for the reaction.This study provides a scientific basis for the safe,efficient,and environmentally friendly synthesis of polyurethanes.
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