Inline Turbidity Measurements of Batch Emulsion Polymerization

Abstract

The aim of the present study is to investigate applications of inline turbidity as a tool to monitor optical properties during batch emulsion polymerization and during emulsification with high sample rates. For this purpose, an InPro 8200 turbidity probe with a Trb 8300 transmitter is used in combination with an RC1e Mettler Toledo reaction calorimeter. Reproducible turbidity inline monitoring during emulsification and polymerization is achieved. Turbidity measurements allow the observation of droplet formation as well as the determination of the time needed to reach a certain emulsion state. Therefore, turbidity can be used to optimize the duration of emulsification. Higher stirring speed and longer duration lead to smaller monomer droplets and to faster reaction. Furthermore, inline turbidity can be used to detect the start of the reaction and to identify emulsion stability problems. (Figure presented.).