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Towards the control of the reactivity in high temperature anionic polymerization of styrene: retarded anionic polymerization. 3 – influence of triisobutylaluminum on the reactivity of polystyryllithium species
Author(s) -
Desbois Philippe,
Fontanille Michel,
Deffieux Alain,
Warzelhan Volker,
Schade Christian
Publication year - 2000
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200007)157:1<151::aid-masy151>3.0.co;2-9
Subject(s) - styrene , reactivity (psychology) , polymerization , polymer chemistry , copolymer , anionic addition polymerization , monomer , chemistry , stoichiometry , bulk polymerization , organic chemistry , polymer , radical polymerization , medicine , alternative medicine , pathology
The addition of triisobutylaluminum to a lithiated‐based anionic polymerization of styrene leads to the formation of aluminate complexes and provokes a drastic reduction of the styrene polymerizability in relation with the Al/Li ratio used. The reaction is first order in monomer and active species and is stopped for iBu 3 Al/PSLi > 1. From U.V. spectrometry, kinetic studies and viscometric measurements, it was possible to suggest the presence of various mixed complexes of different stoichiometries. The strong increase in the thermal stability of the new propagating species together with their much lower reactivity permits the controlled bulk polymerization of styrene at high temperature.