Macromolecular Reaction Engineering

Cover image for Vol. 10 Issue 2

April 2016

Volume 10, Issue 2

Pages 91–150

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
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      Cover Picture: Macromol. React. Eng. 2/2016 (page 91)

      Enrique Saldívar-Guerra, Almendra Ordaz-Quintero, Ramiro Infante-Martínez, Jorge Herrera-Ordóñez, Luis Villarreal-Cárdenas, Diana Ramírez-Wong, Evelia Rivera-Rodríguez, Rodolfo Flores-Flores and Luis Miramontes-Vidal

      Version of Record online: 13 APR 2016 | DOI: 10.1002/mren.201670005

      Thumbnail image of graphical abstract

      Front Cover: The unique rheological properties of LDPE are a result of its MWD, which is determined by a complex free-radical kinetic mechanism. The paper illustrated in the cover analyzes some factors that define the MWD in multizone autoclave reactors by using plant data, simulation and mechanistic arguments. Further details can be found in the article by Enrique Saldívar-Guerra and co-workers on page 123.

  2. Masthead

    1. Top of page
    2. Cover Picture
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    1. Masthead: Macromol. React. Eng. 2/2016 (page 92)

      Version of Record online: 13 APR 2016 | DOI: 10.1002/mren.201670006

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Full Papers
    1. You have free access to this content
  4. Full Papers

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Contents
    5. Full Papers
    1. Modeling Acrylic Acid Radical Polymerization in Aqueous Solution (pages 95–107)

      Nils F. G. Wittenberg, Calista Preusser, Hendrik Kattner, Marek Stach, Igor Lacík, Robin A. Hutchinson and Michael Buback

      Version of Record online: 11 JUN 2015 | DOI: 10.1002/mren.201500017

      Thumbnail image of graphical abstract

      The complexities of aqueous-phase polymerization of non-ionized acrylic acid are captured in a model that considers the formation of midchain radicals, the influence of radical chain length on termination kinetics, and the influence of monomer concentration on propagation kinetics. The model is verified against monomer conversion profiles, polymer branching levels, and molar mass distributions collected over a range of experimental conditions.

    2. Using a Novel CFD Model to Assess the Effect of Mixing Parameters on Emulsion Polymerization (pages 108–122)

      Shideh Fathi Roudsari, Ramdhane Dhib and Farhad Ein-Mozaffari

      Version of Record online: 11 AUG 2015 | DOI: 10.1002/mren.201500019

      Thumbnail image of graphical abstract

      CFD is employed to study the effect of mixing on emulsion polymerization. The validated model incorporates kinetics, population balance, and velocity gradients. Nucleation and growth rates are employed in the population balance model. Effects of mixing on conversion, particle size, and number density are studied. CFD model enables us to optimize the design parameters for emulsion polymerization.

    3. Some Factors Affecting the Molecular Weight Distribution (MWD) in Low Density Polyethylene Multizone Autoclave Polymerization Reactors (pages 123–139)

      Enrique Saldívar-Guerra, Almendra Ordaz-Quintero, Ramiro Infante-Martínez, Jorge Herrera-Ordóñez, Luis Villarreal-Cárdenas, Diana Ramírez-Wong, Evelia Rivera-Rodríguez, Rodolfo Flores-Flores and Luis Miramontes-Vidal

      Version of Record online: 21 JUL 2015 | DOI: 10.1002/mren.201500030

      Thumbnail image of graphical abstract

      This paper discusses the effect of several factors, including the pressure and temperature conditions used in the reactor, on the MWD, which is one of the main features of LDPE. Simulations with the Polyred software package provide a set of kinetic parameters that reproduce, using realistic conditions, the observed trends in number average molecular weight and MWD dispersity in the commercial multizone autoclave reactor.

    4. Dual Catalyst Model Describing the Effect of Branching on the Molecular Architecture of Polyolefins (pages 140–150)

      Ivan Konstantinov, Carlos Villa, Thomas Karjala and Pradeep Jain

      Version of Record online: 17 SEP 2015 | DOI: 10.1002/mren.201500040

      Thumbnail image of graphical abstract

      Analytical solutions for a system with two catalysts, one (L) producing only linear chains and the other (B) capable of long-chain branching, are developed. The polydispersity index associated with Catalyst B displays complex behavior as a function of the number of branches per chain formed and the length of the chains produced at Catalyst L.

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