caa a22 4500 465787770 CHVBK 20180323112014.0 cr unu---uuuuu 170327e19900101xx s 000 0 eng 10.1007/BF00983959 doi (NATIONALLICENCE)springer-10.1007/BF00983959 The influence of total monomer concentration on the "reactivity” of ω-(p-vinylbenzyl ether) macromonomers of poly(2,6-dimethyl-1,4-phenylene oxide) determined from radiacal copolymerization experiments with butyl methacrylate [Elektronische Daten] [Virgil Percec, Ulrich Epple, James Wang, Hans Schneider] Summary: The influence of the total monomer concentration on the radical reactivity ratio r1 of butyl methacrylate (BMA) (M1)-ω-(p-vinylbenzyl ether) macromonomer of poly(2,6-dimethyl-1,4-phenylene oxide) (PPO-VBE) (M2) monomer pair was investigated. For two different molecular weights of the PPO-VBE macromonomer ( $$\bar M_n = 14,000$$ , $${{\bar M_w } \mathord{\left/ {\vphantom {{\bar M_w } {\bar M_n }}} \right. \kern-\nulldelimiterspace} {\bar M_n }} = 1.25$$ and $$\bar M_n = 5,300$$ $${{\bar M_w } \mathord{\left/ {\vphantom {{\bar M_w } {\bar M_n }}} \right. \kern-\nulldelimiterspace} {\bar M_n }} = 1.26$$ ), the determined reactivity ratio r1 decreases with the increase of the macromonomer concentration. Therefore, the reactivity of the macromonomer, 1/r1, follows the opposite trend. This dependence is due to micelles formation during copolymerization. This microsegregation process partitionates the comonomer concentrations between the bulk of solvent and around the growing chain and therefore, the experimental r1 is actually a product of the true reactivity ratio r1 0 and a partition coefficient k. Springer-Verlag, 1990 Percec Virgil Department of Macromolecular Science, Case Western Reserve University, 44106-2699, Cleveland, OH, USA aut Epple Ulrich Institute of Macromolecular Chemistry, University of Freiburg, D-7800, Freiburg, Federal Republic of Germany aut Wang James Department of Macromolecular Science, Case Western Reserve University, 44106-2699, Cleveland, OH, USA aut Schneider Hans Institute of Macromolecular Chemistry, University of Freiburg, D-7800, Freiburg, Federal Republic of Germany aut Polymer Bulletin Springer-Verlag 23/1(1990-01-01), 19-26 0170-0839 23:1<19 1990 23 289 https://doi.org/10.1007/BF00983959 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00983959 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Percec Virgil Department of Macromolecular Science, Case Western Reserve University, 44106-2699, Cleveland, OH, USA aut NATIONALLICENCE 700 1- Epple Ulrich Institute of Macromolecular Chemistry, University of Freiburg, D-7800, Freiburg, Federal Republic of Germany aut NATIONALLICENCE 700 1- Wang James Department of Macromolecular Science, Case Western Reserve University, 44106-2699, Cleveland, OH, USA aut NATIONALLICENCE 700 1- Schneider Hans Institute of Macromolecular Chemistry, University of Freiburg, D-7800, Freiburg, Federal Republic of Germany aut NATIONALLICENCE 773 0- Polymer Bulletin Springer-Verlag 23/1(1990-01-01), 19-26 0170-0839 23:1<19 1990 23 289 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer