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1. Anionic Polymerization of Acrylic Monomers. 15. Living Anionic Copolymerization of Mixtures of Methyl Methacrylate and tert-Butyl Acrylate As Promoted by Dibenzo-18-Crown-6

Author

Jin-Shan Wang, Philippe Teyssie, Maryse Patin, Philippe Bayard, Robert Jérôme, and Laurent Baylac

Subjects
chemistry.chemical_classification, Polymers and Plastics, Organic Chemistry, food and beverages, Inorganic Chemistry, chemistry.chemical_compound, Monomer, Anionic addition polymerization, chemistry, Polymerization, Polymer chemistry, Materials Chemistry, Copolymer, Molar mass distribution, Counterion, Methyl methacrylate, Living anionic polymerization
Abstract

Although μ-coordinating ligands such as LiCl are effective in promoting the well-controlled living anionic block copolymerization of methyl methacrylate (MMA) and tert-butylacrylate (tBuA), whichever monomer is first polymerized, it has been previously shown that a copolymerization of mixtures of these two monomers does not proceed as expected, giving poor results in terms of both conversion and molecular weight distribution: that was accounted for by the easy back-biting nucleophilic attack of a highly sensitive methyl ester group by a moderately hindered PtBuA anion. It is now reported that such a situation can be completely modified, when a cation-binding σ-ligand, i.e., dibenzo-18-CE-6, is used in chelating a sodium counterion and surrounding it with a steric barrier, blocking a large enough space area around the ion pair

Published
1994
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3. Chromatographic Characterization of Polymers

Author

THEODORE PROVDER, HOWARD G. BARTH, MAREK W. URBAN, David J. Hunkeler, Miroslav Janco, Valeria V. Guryanova, Dusan Berek, Josef Janča, William J. Simonsick, Laszlo Prokai, Christian Jackson, Wallace W. Yau, Kevin G. Suddaby, Ramin A. Sanayei, Kenneth F. O'Driscoll, Alfred Rudin, Seungho Lee, Oh-Seung Kwon, Robyn Frank, Lothar Frank, Norman C. Ford, Thomas H. Mourey, Hans Coll, Judy D. Timpa, William S. Bahary, Michael P. Hogan, Mahmood Jilani, Michael P. Aronson, James Lesec, Michèle Millequant, Maryse Patin, Philippe Teyssie, Martin E. Schimpf, John V. Dawkins, Sadao Mori, P. Kilz, R.-P. Krüger, H. Much, G. Schulz, Elizabeth Meehan, Stephen O'Donohue, James N. Willis, L. Wheeler, P. C. Cheung, S. T. Balke, T. C. Schunk, THEODORE PROVDER, HOWARD G. BARTH, MAREK W. URBAN, David J. Hunkeler, Miroslav Janco, Valeria V. Guryanova, Dusan Berek, Josef Janča, William J. Simonsick, Laszlo Prokai, Christian Jackson, Wallace W. Yau, Kevin G. Suddaby, Ramin A. Sanayei, Kenneth F. O'Driscoll, Alfred Rudin, Seungho Lee, Oh-Seung Kwon, Robyn Frank, Lothar Frank, Norman C. Ford, Thomas H. Mourey, Hans Coll, Judy D. Timpa, William S. Bahary, Michael P. Hogan, Mahmood Jilani, Michael P. Aronson, James Lesec, Michèle Millequant, Maryse Patin, Philippe Teyssie, Martin E. Schimpf, John V. Dawkins, Sadao Mori, P. Kilz, R.-P. Krüger, H. Much, G. Schulz, Elizabeth Meehan, Stephen O'Donohue, James N. Willis, L. Wheeler, P. C. Cheung, S. T. Balke, and T. C. Schunk

Subjects
Polymers--Analysis, Chromatographic analysis
Published
1995

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