Macromolecular Reaction Engineering
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Materials Science Weekly Newsletter
Recently Published Articles
- Effect of Monomer Concentration and pH on Reaction Kinetics and Copolymer Microstructure of Acrylamide/Acrylic Acid Copolymer
Marzieh Riahinezhad, Neil McManus and Alexander Penlidis
Article first published online: 28 JAN 2015 | DOI: 10.1002/mren.201400053
Water soluble acrylamide (AAm)/acrylic acid (AAc) copolymers are mainly used for enhanced oil recovery (EOR) applications. This requires the ability to design the copolymer structure and properties for the specific application. In this study, we investigated the effects of reaction factors such as total monomer concentration and solution pH on polymerization kinetics and copolymer microstructure characteristics.
- The Use of Solid-State NMR to Investigate the Development of Segmental Mobility in Commercial Heterophasic Ethylene Propylene Copolymers (HEPCs)
Linda Botha, Pritish Sinha, H. Duveskog and Albert J. Van Reenen
Article first published online: 26 JAN 2015 | DOI: 10.1002/mren.201400043
Solid state 13C NMR probes the changes in distribution of ethylene in rigid and amorphous domains of impact copolymers.
- Mathematical Modeling of Polyether Production from 1,3-Propanediol: Accounting for Linear Oligomers
Wei J. Cui, Kimberley B. McAuley, Rupert E. Spence and Tuyu Xie
Article first published online: 2 JAN 2015 | DOI: 10.1002/mren.201400038
A reactor model is developed to simulate the production of Cerenol® polyethers. The effects of super-acid catalyst and mass transfer of small species (water, monomer, propanal) and linear oligomers (dimer to heptamer) have been modeled. This model correctly predicts the dynamic trends in the concentration changes of linear oligomers, but the predicted maxima in these concentrations appear earlier compared with those from a previous model. The Dp is greatly improved compared with a previous model, where the evaporation of linear oligomers is not considered.
- Branching in RAFT Miniemulsion Copolymerization of Styrene/Triethylene Glycol Dimethacrylate and Control of Branching Density Distribution
Xiaohui Li, Wen-Jun Wang, Bo-Geng Li and Shiping Zhu
Article first published online: 29 DEC 2014 | DOI: 10.1002/mren.201400046
A model-based monomer feeding strategy is developed to achieve digital synthesis and precision production of polymer materials with targeted branching density distribution. For demonstration, a series of hyperbranched polystyrenes having uniform branching density distributions are synthesized via semibatch RAFT miniemulsion copolymerization of styrene and triethylene glycol dimethacrylate.
- 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.