Evaluating time to maximum rate (TMR) and self-accelerating decomposition temperature (SADT) of self-polymerizing vinyl acetate monomer

Cheng, Yu-Chi; Huang, Yun-Shan; Wang, Yih-Wen

doi:10.1016/j.jlp.2021.104452

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…Industrially, VAM should be distilled to remove the inhibitors increasing the conversion of VAM polymerization. In terms of reaction heat, VAM is more stable, with a substantially lower enthalpy change than polyvinyl acetate (∆ H c = 1095.41–1156.64 J g −1 ) [ 26 ]. The earliest onset temperature for 100 mass% VAM was 93.5 °C, and its concentration increased thermal stability for the VAM solution.…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, the 2nd reaction order gave the highest VAM–PVAc polymerization rate [ 28 , 29 ]. Cheng et al [ 26 ] proposed a self-heating model of VAM self-sustaining decomposition with a first-order reaction. The polymerization rate of VAM–PVAc obeyed an nth order reaction as follows: where k is a rate constant as an exponential function of temperature, k 0 is an Arrhenius rate constant, R is an ideal gas constant (8.314 J mol −1 °C −1 ), E a is the activation energy, and [C VAM ] is the concentration of VAM.…”

Section: Resultsmentioning

confidence: 99%

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Thermal runaway evaluation on batch polyvinyl acetate emulsion polymerization from calorimetric measurement

Wang

Yin

2023

J Therm Anal Calorim

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Emulsion polymerization is the most applied method in the vinyl acetate monomer (VAM)–polyvinyl acetate (PVAc) process. However, the flammable property and unexpected bulk polymerization for the reactant and product may occur in the batch reactor or storage tank. VAM is reactive enough to decompose readily into free radicals and then, initiate the polymerization, which may contribute to heat accumulation due to the monomer, initiator, and solvent mixtures. This study attempts to analyze the exothermic reaction and compare the thermal runaway potential for various VAM solutions during PVAc polymerizations. Summarily, 50%, 70%, and 100% of VAM solutions reacting with 2,2’–azobis(2-methylpropionitrile) readily increase the self-heating rate with their concentration from adiabatic calorimetric tests. Furthermore, kinetic parameters of 50, 70, and 100 mass% VAM solutions were evaluated to elucidate the self-heating model associated with thermal analysis and to determine heat production mechanisms that are practical to proactive safety protocol for the PVAc emulsion process.

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Section: Resultsmentioning

confidence: 99%