Abstract
The purpose of this study is to obtain a better understanding of Michael addition reaction (MAR) which may induce runaway polymerization of acrylic acid. The heat of MAR was measured using a C80 Calvet-type heat flux calorimeter, and products of MAR were revealed by gel permeation chromatography. The reaction rate constant of MAR was obtained from kinetic analysis. In high-sensitivity calorimetry, a low rate of heat release due to MAR was detected. The heat of MAR was 109 J g−1 and conversion of acrylic acid to Michael adducts was 82 mass%. The products of MAR were acrylic acid dimers, trimers and tetramers. The reaction order was 2.5th, and the overall reaction rate constant was k = 3.52 × 103 × exp (−1.18 × 105/T [K]) L1.5 mol−1.5 s−1. The activation energy of MAR was 98.0 kJ mol−1, which was similar in value to that of dimerization in previous studies. This indicated that dimer formation is the dominant reaction in MAR.
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