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A New Family of Styrene/Diene Rubbers
Author(s) -
Zinck Philippe,
Terrier Michaël,
Mortreux André,
Valente Andreia,
Visseaux Marc
Publication year - 2007
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200700055
Subject(s) - styrene , copolymer , diene , isoprene , polymer chemistry , materials science , ligand (biochemistry) , selectivity , chemistry , polymer , natural rubber , organic chemistry , composite material , catalysis , biochemistry , receptor
The insertion of single styrene units into polyisoprene is demonstrated using borohydrido rare earth/dialkylmagnesium systems. This yields a new family of styrene/diene copolymers (SBR rubbers). The resulting poly[(1,4‐ trans ‐isoprene)‐ co ‐styrene] exhibits quite narrow molecular weight distributions, up to 30% inserted styrene, and a 96–98% 1,4‐ trans ‐microstructure. The presence of a bulky and electron‐rich ligand in the coordination sphere of the metal leads to an increase of the amount of styrene inserted and narrower chemical composition and molecular weight distributions. The presence of significant quantities of styrene in the medium does not alter the selectivity of the reaction, in contrast with cis ‐specific polymerizations.