Macromolecular Reaction Engineering
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Materials Science Weekly Newsletter
Recently Published Articles
- Achieving High-Conversion Bulk ATRP with Good Livingness and Well Controlled by Design and Optimization of Polymerization Temperature Profile
Ali Mohammad Rabea and Shiping Zhu
Article first published online: 28 JUL 2014 | DOI: 10.1002/mren.201400019
Bulk ICAR ATRP of MMA is carried out up to high conversions. By means of optimization of the ICAR rate by a predesigned temperature profile, well-controlled polymer molecular weights are achieved. Polymers of PDI < 1.3 with initiator efficiencies close to 100% are obtained up to 98% conversion. Chain extension experiments confirm the livingness of the final products.
- Modeling the Kinetics of Monolith Formation by RAFT Copolymerization of Styrene and Divinylbenzene
Porfirio López-Domínguez, Julio César Hernández-Ortiz, Kristine J. Barlow, Eduardo Vivaldo-Lima and Graeme Moad
Article first published online: 26 JUN 2014 | DOI: 10.1002/mren.201400013
The production of RAFT-based poly(styrene-co-divinylbenzene) monoliths is successfully modeled using a multifunctional polymer molecule approach. The inclusion of diffusion-controlled effects can produce feasible simulations, but non-isothermal effects in the reacting tubes may have to be taken into account in further refinements to the model.
- Acrylic–Alkyd Hybrids: Secondary Nucleation, Particle Morphology, and Limiting Conversions
Ravindra Udagama, Carolina de las Heras Alarcón, Joseph L. Keddie, John G. Tsavalas, Elodie Bourgeat-Lami and Timothy F. L. McKenna
Article first published online: 25 JUN 2014 | DOI: 10.1002/mren.201400003
The polymerization of miniemulsions of acrylic monomer/alkyd mixtures is studied. It is shown that complete conversion can only be obtained if secondary nucleation is allowed to occur at high alkyd contents. In addition, it is demonstrated that the choice of initiator can have a significant impact on particle morphology and the quality of the resulting films.
- RAFT Ab Initio Emulsion Polymerization of Styrene Using Poly(acrylic acid)-b-polystyrene Trithiocarbonate of Various Structures as Mediator and Surfactant
Jie Huang, Shuai Zhao, Xiang Gao, Yingwu Luo and Bogeng Li
Article first published online: 25 JUN 2014 | DOI: 10.1002/mren.201400010
Ab initio emulsion polymerization of styrene using the AAx-b-StymacroRAFT as both mediator and surfactant is investigated by varying x and y values in a systematic way. The polymerization is well-controlled in terms of little coagulum and low PDI by using KPS as initiator but the experimental s deviate from the theoretical values according to different HLB values due to the oxidization. Replacing KPS with V501 as initiator, is in excellent agreement with the theoretical predictions, however with higher PDI.
- Effect of Agitation on Density of Poly(vinyl acetate) Particles Produced in Suspension Polymerization Reactions
Felipe B. Cordeiro, Luciana S. Peixoto, Marco A. M. Oliveira and José Carlos Pinto
Article first published online: 18 JUN 2014 | DOI: 10.1002/mren.201400017
Hollow particles formed through vinyl acetate suspension polymerization are shown containing smaller sub-particles, due to the encapsulation of water when the agitation speed is sufficiently high, which can explain the variation of polymer density with modification of the agitation speed.