Macromolecular Reaction Engineering
Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Materials Science Weekly Newsletter
Recently Published Articles
- CFD Derived Results Lead to An Installation of An Overflow Technique in A Microreactor for Gas-Phase Ethene Homo Polymerization
Leonhard Mayrhofer, Apostolos Krallis, Christof Wurnitsch and Christian Paulik
Article first published online: 11 DEC 2014 | DOI: 10.1002/mren.201400031
An overflow is installed in a micro-gas phase reactor, to achieve conditions which are comparable to industry. At first CFD calculations have been performed to evaluate the reactor setup and according to these results the reactor is modified. The overflow leads to an improved heat removal from the growing polymer particles. The performed overflow-polymerizations are compared with polymerizations in static conditions.
- Markovian Approach to Free-Radical Polymerization with Simultaneous Long-Chain Branching and Scission: Effect of Branching and Scission Kinetics
Article first published online: 9 DEC 2014 | DOI: 10.1002/mren.201400042
The effect of branching and scission kinetics on the branched structure formation is investigated by using the analytic solution and the Monte Carlo simulation method. The illustrative calculations showed that the effect of different kinetics could be negligible when the final monomer conversion is smaller than about 25%, but may give significant differences at higher conversions as shown in the figure.
- Deterministic Modeling of Copolymer Microstructure: Composition Drift and Sequence Patterns
Ivan Kryven and Piet D. Iedema
Article first published online: 2 DEC 2014 | DOI: 10.1002/mren.201400047
The paper present a new deterministic approach allowing to study copolymer sequence distributions. The solution strategy is illustrated for styrene/acrylonitrile polymerization, highlighting the presence of different sequences, bimodalities, and a composition drift.
- Modeling of Polyamide 66 Solid State Polymerization: Drawing a Chemical Reaction Scheme
Viviane Filgueiras, Stamatina N. Vouyiouka, Maria O. Konstantakopoulou, Anastasia C. Boussia, Constantine D. Papaspyrides, Enrique Luis Lima and José Carlos Pinto
Article first published online: 13 NOV 2014 | DOI: 10.1002/mren.201400033
A chemical reaction scheme is proposed to describe polyamide 66 solid state polymerization using data measured under kinetic- and diffusion-controlled process conditions for reaction temperatures in the range of 160–200 °C and times up to 8 h. The obtained model can be correlated to industrial practice providing “safe” SSP conditions.
- On the Reaction Characteristics of Miniemulsion Polymerization with Aqueous Phase Initiation – Experiments and Modeling
Tom G. T. Jansen, Jan Meuldijk, Peter A. Lovell and Alex M. van Herk
Article first published online: 18 SEP 2014 | DOI: 10.1002/mren.201400025
Monomer redistribution, droplet disappearance, and narrowing of the particle size distribution have been observed for miniemulsion polymerizations of monomers with different water solubilities, initiated by water-soluble sodium persulfate. These phenomena are mechanistically explained using thermodynamic principles, clearly displaying that a one-to-one copy of monomer droplets into polymer particles is not an intrinsic property of miniemulsion polymerization.