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Dual influence of lithium chloride on the reactivity of polystyryllithium in ethereal solvents
Author(s) -
Van Beylen Marcel,
Van Lierde Paul,
Zimm Bruno H.,
Szwarc Michael
Publication year - 1997
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.1997.030180207
Subject(s) - electrolyte , ion , chemistry , dissociation (chemistry) , polymerization , lithium (medication) , chloride , polymer , lithium chloride , reactivity (psychology) , inorganic chemistry , polymer chemistry , photochemistry , organic chemistry , medicine , electrode , endocrinology , alternative medicine , pathology
Addition of LiCl to ethereal solutions of polystyryllithium retards propagation of the polymerization at low polymer concentration, but accelerates it at higher polymer concentrations. This phenomenon is accounted for by the dual action of LiCl. Its dissociation yielding free common Li + ions which diminish the concentration of the reactive free polystyryl anions dominates at low electrolyte concentrations. However, at their higher concentrations the Li + scavenging action of LiCl, resulting in the formation of LiClLi + triple ions, becomes important, it reduces the concentration of the free Li + ions and increases, therefore, the proportion of the reactive free polystyryl anions.