Macromolecular Reaction Engineering
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Recently Published Articles
- Effect of Prepolymerization on the Kinetics of Ethylene Polymerization and Ethylene/1-Hexene Copolymerization with a Ziegler–Natta Catalyst in Slurry Reactors
Keran Chen, Boping Liu and João B. P. Soares
Article first published online: 29 JAN 2016 | DOI: 10.1002/mren.201500066
The effect of prepolymerization conditions is quantified on ethylene homopolymerization and ethylene/1-hexene copolymerization using a lumped-parameter polymerization kinetics model. The apparent kinetic constants correlates not only to the prepolymerization conditions, but also to the morphology of the prepolymer particles: prepolymer particles with better fragmentation and less polymer fibrils activate faster and polymerize at higher rates in the main polymerization reactor.
- Optimizing Control and State Estimation of a Continuous Polymerization Process in a Tubular Reactor with Multiple Side-Streams
Reza Hashemi, Daniel Kohlmann and Sebastian Engell
Article first published online: 29 JAN 2016 | DOI: 10.1002/mren.201500034
Production of polymers in modular continuous reactors was one of the goals of the European F3-factory project. The control of such plants is not an easy task as the process is described by nonlinear complex partial differential equations and the available measurements are few. In this work, we propose an optimizing control scheme to control such plants and maximize the plant throughput, while the product quality constraints are met.
- Vanadium Modification Effects on the (SiO2/MgO/MgCl2)•TiClx Ziegler–Natta Polyethylene Catalyst
Jingwen Wang, Ruihua Cheng, Xuelian He, Zhen Liu, Ning Zhao and Boping Liu
Article first published online: 22 JAN 2016 | DOI: 10.1002/mren.201500056
Novel vanadium-modified (SiO2/MgO/MgCl2)·TiClx Ziegler–Natta ethylene polymerization catalysts with improved catalytic performance are successfully developed and systematically investigated. Proper addition amount of vanadium modification induce better catalytic performance with 27% higher activity, 48% higher hydrogen response, and 60% higher 1-hexene incorporation ability with better short chain branch distribution.
- Flash Latex Production in a Continuous Helical Photoreactor: Releasing the Brake Pedal on Acrylate Chain Radical Polymerization
Abraham Chemtob, Emeline Lobry, Agnès Rannée, Florent Jasinski, Marta Penconi, Esther Oliveros, André M. Braun and Adrien Criqui
Article first published online: 21 JAN 2016 | DOI: 10.1002/mren.201500060
A novel continuous radical photopolymerization process enables to convert acrylate monomer emulsion with surprisingly high efficiency. The combination of a photochemical minireactor, the resulting very short polymerization times, low costs of production, and the simplicity of the equipment may be of interest to change the way emulsion polymerization is performed both at research and industrial levels.
- Effect of Droplet Size in Acrylamide-Based Microgel Formation by Microfluidics
Fany Di Lorenzo and Sebastian Seiffert
Article first published online: 21 JAN 2016 | DOI: 10.1002/mren.201500061
Above-colloidal-scale microgel particles can be prepared with exquisite control by droplet-based microfluidic particle templating followed by droplet gelation. In this process, the success of droplet gelation depends on the concentration of reagents within the droplets, on temperature, and on droplet size, which this work assesses in a systematic fashion for two popular acrylamide-type monomers.