Macromolecular Reaction Engineering

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Recently Published Articles

  1. 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

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    Solid state 13C NMR probes the changes in distribution of ethylene in rigid and amorphous domains of impact copolymers.

  2. 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

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    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.

  3. 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

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    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.

  4. 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

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    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.

  5. Markovian Approach to Free-Radical Polymerization with Simultaneous Long-Chain Branching and Scission: Effect of Branching and Scission Kinetics

    Hidetaka Tobita

    Article first published online: 9 DEC 2014 | DOI: 10.1002/mren.201400042

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    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.