Polymer Versus Polymerization Fouling: Basic Deposition Mechanisms During Emulsion Polymerization by the Example of a Vinyl Acetate and Versa 10 Copolymer

Abstract

The deposition process during emulsion polymerization can be classified as both particulate and reaction fouling, but a deeper understanding of the deposition mechanism, especially in combination with the polymerization process, is lacking. Here, a more in‐depth understanding of the deposition mechanism was sought by investigating the fouling formation of a Vinyl acetate and Versa® 10 copolymer on a heated stainless steel surface during emulsion polymerization. Its deposition behavior was also compared with the behavior of an already reacted polymer. All possible influencing factors were investigated separately, and the fouling was quantified by the mass based fouling resistance and the fouling layer composition. The fouling rates of both experimental approaches (ongoing reaction versus already reacted polymer) were used to determine the fraction of reaction fouling along the reaction pathway. The solids content and the driving temperature difference were identified as the main factors influencing fouling formation. The deposited material was composed of latex particles and emulsifier with particle size and number depending on the respective equilibrium composition of the fluid phase. The reaction fouling rate was correlated with the proportion of free initiator radicals and the amount of dissolved monomer in the aqueous phase.This article is protected by copyright. All rights reserved