Macromolecular Theory and Simulations

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April 17, 2015

TALENT: Regioselective Metal-Free Click Polymerization of Azides and Alkynes

TALENT: Regioselective Metal-Free Click Polymerization of Azides and Alkynes

Anjun Qin,* Yong Liu, Ben Zhong Tang*

Metal-free click polymerization (MFCP) has been developed to circumvent the problems inherent in the broadly-applied Cu(I)-catalyzed azide-alkyne click polymerization reactions. The regioselective MFCP of azides and alkynes to produce regioregular polytriazoles is summarized, and the properties and applications of the resultant polymers are also discussed.

Macromol. Chem. Phys., DOI: 10.1002/macp.201400571

More information on the invited Talent, Trend, and Highlight articles in Macromolecular Chemistry and Physics can be found here.

February 03, 2015

TALENT: Bioinspired Polymeric Nanocomposites for Regenerative Medicine

TALENT: Bioinspired Polymeric Nanocomposites for Regenerative Medicine

James K. Carrow and Akhilesh K. Gaharwar*

Designing bioinspired nanomaterials for tissue-engineering applications requires a fundamental understanding of the interactions between polymers, nanostructures, and cells. Biomimetic structures composed of fibrous architectures are discussed, the emerging trends in designing complex nanocomposites with multiple functionalities are assessed and finally, some of the most critical challenges that come with the design and fabrication of bioinspired polymeric nanocomposites are highlighted.

Macromol. Chem. Phys., DOI: 10.1002/macp.201400427

More information on the invited Talent, Trend, and Highlight articles in Macromolecular Chemistry and Physics can be found here.

January 30, 2015

TREND: Supramolecular Assembly-Assisted Synthesis of Responsive Polymeric Materials with Controlled Chain Topologies

TREND: Supramolecular Assembly-Assisted Synthesis of Responsive Polymeric Materials with Controlled Chain Topologies

Jinming Hu, Shiyong Liu*

Recent advances concerning the fabrication of stimuli-responsive polymeric materials under the assistance of supramolecular self-assembly are summarized. The templated synthesis of linear (multiblock) copolymers, non-linear shaped copolymers, as well as crosslinked nanostructures on the basis of supramolecular assemblies is discussed.

Macromol. Chem. Phys., DOI: 10.1002/macp.201400578

More information on the invited Talent, Trend, and Highlight articles in Macromolecular Chemistry and Physics can be found here.

January 21, 2015

TREND: Polymers and Ionic Liquids: A Successful Wedding

TREND: Polymers and Ionic Liquids: A Successful Wedding

Sébastien Livi,* Jannick Duchet-Rumeau, Jean-François Gérard, Thi Nhan Pham4

Different pathways for development of nanostructured and advanced materials are summarized, based on the use of ionic liquids (ILs) as multifunctional agents of polymer matrices. The true potential of ILs in the design of new polymeric materials with unprecedented mechanical per­formance, thermal stability, and barrier properties is highlighted.

Macromol. Chem. Phys., DOI: 10.1002/macp.201400425

More information on the invited Talent, Trend, and Highlight articles in Macromolecular Chemistry and Physics can be found here.

March 21, 2011

POLYMER DESIGN: Kinetic Modeling as a Tool to Understand and Improve the Nitroxide Mediated Polymerization of Styrene

POLYMER DESIGN: Kinetic Modeling as a Tool to Understand and Improve the Nitroxide Mediated Polymerization of Styrene

Lien Bentein, Dagmar R. D'hooge, Marie-Françoise Reyniers,* Guy B. Marin

Detailed kinetic simulations, systematically accounting for diffusional limitations, for SG1 and TEMPO mediated bulk polymerization of styrene reveal the importance of transfer reactions on the polymer properties. Simulations indicate that careful control of the polymerization conditions can succeed in suppressing transfer reactions and allows obtaining an important improvement of average chain length, polydispersity index, and end-group functionality.

Macromol. Theory Simul. DOI: 10.1002/mats.201000081

September 07, 2010

POLYMER DESIGN: Kinetic Simulations of Atom Transfer Radical Polymerization (ATRP) in Light of Chain Length Dependent Termination

POLYMER DESIGN: Kinetic Simulations of Atom Transfer Radical Polymerization (ATRP) in Light of Chain Length Dependent Termination

Geoffrey Johnston-Hall, Michael J. Monteiro*

Kinetic simulations using the composite kt model allows a better understanding of the effects of the persistent radical affecting ATRP or for that matter any activation-deactivation system. It also provides a better fit to experimental data in either bulk or solution conditions for ATRP polymerizations carried out at 110°C. The PRE controls the molecular weight distribution, exemplified by a linear increase in Mn with conversion and a low PDI.

Macromol. Theory Simul. DOI: 10.1002/mats.201000023

December 22, 2009

POLYMER DESIGN: Kinetic Simulations of Reversible Chain Transfer Catalyzed Polymerization (RTCP): Guidelines to Optimum Molecular Weight Control

POLYMER DESIGN: Kinetic Simulations of Reversible Chain Transfer Catalyzed Polymerization (RTCP): Guidelines to Optimum Molecular Weight Control

Philipp Vana,* Atsushi Goto*

Compartmentalization and nitroxide partitioning in nitroxide-mediated radical polymerization in dispersed systems have been investigated by modeling and simulations. Compartmentalization comprises the segregation effect on termination and the confined space effect on deactivation. Under certain conditions, it is possible to obtain an improvement in both control and livingness.

Macromol. Theory Simul. DOI: 10.1002/mats.200900064

November 17, 2009

POLYMER DESIGN: Nitroxide-Mediated Radical Polymerization in Dispersed Systems: Compartmentalization and Nitroxide Partitioning

POLYMER DESIGN: Nitroxide-Mediated Radical Polymerization in Dispersed Systems: Compartmentalization and Nitroxide Partitioning

Per B. Zetterlund

Compartmentalization and nitroxide partitioning in NMP in dispersed systems have been investigated by modeling and simulations. Compartmentalization comprises the segregation effect on termination and the confined space effect on deactivation. Under certain conditions, it is possible to obtain an improvement in both control and livingness. The particle size threshold for compartmentalization, decreases with any system change that leads to a decrease in the number of propagating radicals and/or nitroxides per particle, and vice versa. There is direct competition between the confined space effect on deactivation and nitroxide exit-the more water-soluble the nitroxide, the weaker the confined space effect. Nitroxide partitioning leads to an increase in polymerization rate and loss in control/livingness.

Macromol. Theory Simul. DOI: 10.1002/mats.200900051

October 12, 2009

POLYMER DESIGN: Quantum-Chemical Modeling of Free-Radical Polymerization

POLYMER DESIGN: Quantum-Chemical Modeling of Free-Radical Polymerization

Michelle L. Coote

This article reviews recent progress in the application of quantum chemistry to radical polymerization processes, with a principle focus on establishing the current best-practice methodology for obtaining chemically accurate calculations. The scope and limitations of computational chemistry for this field are also discussed, and some of its leading applications in the areas of ab initio kinetic modeling and computer-aided reagent design are highlighted

Macromol. Theory Simul. DOI: 10.1002/mats.200900050

September 24, 2009

POLYMER DESIGN: Optimum Reaction Conditions for the Synthesis of Macromonomers Via the High-Temperature Polymerization of Acrylates

POLYMER DESIGN: Optimum Reaction Conditions for the Synthesis of Macromonomers Via the High-Temperature Polymerization of Acrylates

Thomas Junkers*, Christopher Barner-Kowollik*

Macromonomers are valuable synthetic building blocks: They can be copolymerized with low molecular weight monomers to generate brush-like structures or serve as conjugation substrates in pericylic, metathesis, and thiolene reactions. Based on earlier reports on the facile high temperature formation of macromonomers from acrylates, a complex kinetic model is developed which accounts for the key reactions constituting the macromonomer formation process. On the basis of the kinetic model, the important rate coefficients governing acrylate polymerization (e.g., -scission and termination rate coefficients of midchain radicals, backbiting and intramolecular chain transfer rate coefficients) as well as the reaction conditions (e.g., initial monomer concentration, reaction temperature, radical flux) are systematically varied and their influence on the synthetic success is critically evaluated. The systematic coefficient variation reveals that there exist optimum reaction conditions under which the high temperature macromonomers formation may be conducted with maximum success. The present study provides a concise summary of these conditions.

Macromol. Theory Simul. DOI: 10.1002/mats.200900025

September 16, 2009

POLYMER DESIGN: Kinetic Modeling of Nitroxide-Mediated Polymerization: Conditions for Living and Controlled Polymerization

POLYMER DESIGN: Kinetic Modeling of Nitroxide-Mediated Polymerization: Conditions for Living and Controlled Polymerization

Didier Gigmes, Denis Bertin, Catherine Lefay, Yohann Guillaneuf*

Simulations of conversion versus time, molecular weight (Mn), polydispersity index (PDI), and living fractions versus conversion plots are performed using the PREDICI software, to study the influence of several kinetic parameters on the living and controlled character of nitroxide-mediated polymerization (NMP). In particular, the crucial role of the main equilibrium represented by both kd and kc (the rate coefficients respectively of dissociation and recombination) is highlighted. On the other hand, the importance of the initiation step, the targeted Mn value, and the initial excess of free nitroxide are also demonstrated. It is further proved that side reactions, such as disproportionation and transfer to solvent, have a strong impact on the polymerization characteristics.

Macromol. Theory Simul. DOI: 10.1002/mats.200900019

September 15, 2009

POLYMER DESIGN: Special Article Series on 'Modeling for Polymer Design'

POLYMER DESIGN: Special Article Series on 'Modeling for Polymer Design'

Christopher Barner-Kowollik

As shown by a series of modeling studies, advanced synthetic polymer chemistry and the physical understanding of the underpinning reaction kinetics are inextricably linked. Both areas must be viewed as one unit if synthetic processes are to be optimized (or even made possible) with regard to the chosen reaction conditions as well as the addition and design of controlling agents and/or catalysts. The articles in the present series are designed to be used as a bridge between synthesis and modeling.

Guest-edited by Christopher Barner-Kowollik (University of Karlsruhe), the new article series "Modeling for Polymer Design" will highlight the most important developments and trends in this field.

Macromol. Theory Simul. DOI: 10.1002/mats.200900046

April 17, 2015
TALENT: Regioselective Metal-Free Click Polymerization of Azides and Alkynes

February 03, 2015
TALENT: Bioinspired Polymeric Nanocomposites for Regenerative Medicine

January 30, 2015
TREND: Supramolecular Assembly-Assisted Synthesis of Responsive Polymeric Materials with Controlled Chain Topologies

January 21, 2015
TREND: Polymers and Ionic Liquids: A Successful Wedding

March 21, 2011
POLYMER DESIGN: Kinetic Modeling as a Tool to Understand and Improve the Nitroxide Mediated Polymerization of Styrene

September 07, 2010
POLYMER DESIGN: Kinetic Simulations of Atom Transfer Radical Polymerization (ATRP) in Light of Chain Length Dependent Termination

December 22, 2009
POLYMER DESIGN: Kinetic Simulations of Reversible Chain Transfer Catalyzed Polymerization (RTCP): Guidelines to Optimum Molecular Weight Control

November 17, 2009
POLYMER DESIGN: Nitroxide-Mediated Radical Polymerization in Dispersed Systems: Compartmentalization and Nitroxide Partitioning

October 12, 2009
POLYMER DESIGN: Quantum-Chemical Modeling of Free-Radical Polymerization

September 24, 2009
POLYMER DESIGN: Optimum Reaction Conditions for the Synthesis of Macromonomers Via the High-Temperature Polymerization of Acrylates

September 16, 2009
POLYMER DESIGN: Kinetic Modeling of Nitroxide-Mediated Polymerization: Conditions for Living and Controlled Polymerization

September 15, 2009
POLYMER DESIGN: Special Article Series on 'Modeling for Polymer Design'

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