Journal article

Modeling of the high-temperature polymerization of methyl methacrylate. 1. Review of existing models for the description of the gel effect

High-temp. polymn. has recently become of interest for industry because it yields higher reaction rates, and thus less reaction time, lower viscosity, and higher conversions. However, it also leads to new challenges for process engineering in regards to materials, reactor design, and, most of all, process modeling. Because practically all kinetic research in the field of polymns. has been realized for rather low temp. ranges (mostly below the glass transition temp.), the correct modeling of a high-temp. polymn. requires the investigation of various parameters, such as thermal initiation effects, depropagation reactions, etc., and a careful adaptation of existing models for kinetics at significantly higher temps. The attention is focused on the modeling of the gel effect based on existing models available from the literature. Therefore, two different types of models, one semiempirical and one based on the free-vol. theory, are examd. for their applicability to high-temp. polymn. by comparison with the exptl. results from differential scanning calorimetry batch polymns. Model fitting was realized using the software package PREDICI by CiT GmbH, Rastede, Germany.


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