Polymerisation Reactors (polymerisation + reactor)

Distribution by Scientific Domains

Selected Abstracts

Diffusion-Controlled Particle Growth and its Effects on Nucleation in Stirred Emulsion Polymerisation Reactors

Shahriar Sajjadi
Abstract Summary: Particle formation and growth in the batch emulsion homo-polymerisation of styrene and methyl methacrylate monomers under diffusion-controlled conditions were studied. The polymerisations started with two stratified layers of a monomer and water containing an initiator and a surfactant, with the water layer being gently stirred. Because of limitations in monomer transport, the rate of particle growth was substantially reduced and as a result a large number of polymer particles formed. Schematic presentation of the highly diffusion-controlled polymerisation. [source]

An Integrated Model-Based Analysis of Polymer Chemistry and Polymerisation Reactors

Charles D. Immanuel
Abstract In this paper, a simple demonstration is presented on the analysis of the combined effect of polymer chemistry and the polymerisation reactor on the polymer properties. The model would ideally account for the raw material and end-product characteristics and properties on the one hand; the polymerisation kinetics and reaction engineering on the other hand. This system-wide model-driven approach enables the interlinking of the widely disparate facets of polymer science and engineering, and thereby provides a tool for rapid and efficient identification and scale-up of new polymeric materials that would be exploited in future studies. The ideas are demonstrated with regard to a hyper-branched polymerisation chemistry. [source]

Monitoring of Emulsion Polymerisation Processes using Ion Mobility Spectrometry,A Pilot Study

Wolfgang Vautz
Abstract Online monitoring of monomer concentrations in (semi-) batch emulsion polymerisation reactors is important for safe and cost-efficient operation of production plants. In the present pilot study, ion mobility spectrometry was applied for monitoring the concentration during emulsion polymerisation of vinyl acetate (VA) using UV light for ionisation of the headspace of a continuous sample flow. Satisfactory sensitivity for online process monitoring of the monomer concentration in the reactor was observed (LOD 400 ng,,L,1 air, equivalent to <1%). Furthermore, it is possible to discriminate between VA and other common monomers [butyl acrylate (BA), methyl methacrylate (MMA)]. Using the more efficient , -radiation ionisation, monomer concentration could be measured even in the final latex as a measure of the final product properties. [source]