Macromolecular Reaction Engineering

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Recently Published Articles

  1. Effect of Varying Hydrogen Concentration, External Donor Concentration, and Temperature on Propylene Polymerization Kinetics and Microstructure of Polypropylene Made with a 4th Generation Ziegler–Natta Catalyst

    Ahmad Alshaiban and João B. P. Soares

    Article first published online: 10 SEP 2014 | DOI: 10.1002/mren.201400028

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    The combined effect of hydrogen and external electron donor concentrations on the tacticity of polypropylene made with a 4th generation Ziegler–Natta catalyst was systematically studied. As illustrated in the figure, the frequency of mmmm pentads increased at higher donor and hydrogen concentrations, but the hydrogen effect was more pronounced at lower donor concentrations.

  2. An Experimental and Theoretical Investigation of the Ring-Opening Polymerization of L,L-Lactide

    Prokopios Pladis, Konstantina Karidi, Theofanis Mantourlias and Costas Kiparissides

    Article first published online: 3 SEP 2014 | DOI: 10.1002/mren.201400032

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    The present study deals with the theoretical and experimental investigation of the ROP of L,L-lactide in the presence of Sn(Oct)2 for the production of high molecular weight PLLA. A comprehensive mathematical model is proposed based on a detailed kinetic mechanism of ROP of L,L-lactide to predict the dynamic evolution of monomer conversion and molecular weight developments.

  3. Thermal Behavior of Polyethylene Reactor Alloys Polymerized by Ziegler–Natta/Late Transition Metal Hybrid Catalyst

    Saeid Ahmadjo, Samaneh Dehghani, Gholam Hossein Zohuri, Gholam Reza Nejabat, Hamed Jafarian, Mostafa Ahmadi and Seyed Mohammad Mahdi Mortazavi

    Article first published online: 25 AUG 2014 | DOI: 10.1002/mren.201400024

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    Ziegler-Natta (ZN) and late transition metal (LTM) hybrid catalysts were synthesized and utilized in preparation of polyethylene (PE) reactor alloys. By changing reaction parameters, versatile thermal behavior from LTM-PE to ZN-PE could be obtained. The proposed method seems to be a promising approach for synthesis of tailor-made polyethylene in a single reactor.

  4. Poly(Urea–Urethane) Synthesis by Miniemulsion Polymerization Using Microwaves and Conventional Polymerization

    Alexsandra Valério, Montserrat Fortuny, Alexandre F. Santos, Pedro H. H. Araújo and Claudia Sayer

    Article first published online: 18 AUG 2014 | DOI: 10.1002/mren.201400029

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    The effect of microwave irradiation during step growth polymerization in miniemulsion to form poly(urea–urethane) nanoparticles is evaluated for different reaction temperatures and polyol types, including oil soluble and water soluble polyols.

  5. Modeling of RAFT Polymerization using Probability Generating Functions. Detailed Prediction of Full Molecular Weight Distributions and Sensitivity Analysis

    Cecilia Fortunatti, Claudia Sarmoria, Adriana Brandolin and Mariano Asteasuain

    Article first published online: 6 AUG 2014 | DOI: 10.1002/mren.201400020

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    A model based on the pgf transform is presented that simulates the RAFT polymerization according to any of the three main kinetic mechanisms discussed in the literature. The full MWD and the bivariate distribution corresponding to the two-arm intermediate adduct are obtained. A sensitivity analysis over several of the kinetic constants is also performed.