Macromolecular Reaction Engineering
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Recently Published Articles
- Multiscale Modeling of Mixing Behavior in a 3D Atom Transfer Radical Copolymerization Stirred-Tank Reactor
Le Xie, Li-Tao Zhu, Zheng-Hong Luo and Chong-Wen Jiang
Version of Record online: 11 JUL 2016 | DOI: 10.1002/mren.201600022
A computational fluid dynamics model combining the moment method used in the polymerization engineering field is implemented and validated using open data. Multiscale properties are characterized in terms of macroscopic mixing fields and the polymer microscopic structure. The simulated results highlight the function of stirring and provide useful guidelines for the scale-up of stirred-tank polymerization reactors.
- Bulk Free Radical Polymerization of Methyl Methacrylate and Vinyl Acetate: A Comparative Study
David Victoria-Valenzuela, Jorge Herrera-Ordonez, Gabriel Luna-Barcenas, George D. Verros and Dimitris S. Achilias
Version of Record online: 11 JUL 2016 | DOI: 10.1002/mren.201600008
The kinetic behavior of the bulk methyl methacrylate and vinyl acetate polymerization is studied with the aid of a novel methodology for estimating kinetic rate coefficients and calorimetric measurements of the rate of polymerization. Similarities and differences between both systems as those shown in the figure are discussed. The results highlight the importance of the segmental motion of long radical chain-ends.
- Effect of Acid Treatment of Montmorillonite on “Support-Activator” Performance to Support Metallocene for Propylene Polymerization Catalyst
Takao Tayano, Hideshi Uchino, Takehiro Sagae, Katsuyuki Yokomizo, Koji Nakayama, Shigeki Ohta, Hiroshi Nakano and Masahide Murata
Version of Record online: 5 JUL 2016 | DOI: 10.1002/mren.201600017
Acid-treated montmorillonite is commonly used as a “support-activator” (S-A) for metallocene-catalyzed olefin polymerization. The activation mechanism for the catalysis process is investigated. Highly active catalysts are achieved when the S-A possesses strong acid sites (pKa < −8.2), which are located in small pores at the edge of the clay mineral as opposed to the interlayer.
- Mathematical Modeling of the Internal Surface Area of Copolymer Particles Based on Elementary Gel Structures
Leandro G. Aguiar
Version of Record online: 30 JUN 2016 | DOI: 10.1002/mren.201600023
A mathematical modeling concerning the dynamics of surface area formation during a copolymerization is presented. The internal surface area of the copolymer particles is predicted through numerical fractionation and the concept of elementary gel structure.