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Some aspects of the living isobutylene polymerization
Author(s) -
Kelen Tibor,
Kelen Tibor,
Balogh Lajos,
Majoros Istvan,
Deak Gyorgy
Publication year - 1993
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19930670126
Subject(s) - isobutylene , cationic polymerization , monomer , chemistry , dissociation (chemistry) , polymer chemistry , polymerization , living polymerization , chain transfer , photochemistry , organic chemistry , radical polymerization , copolymer , polymer
The possibilities of increasing the livingness in cationic isobutylene polymerizations has been investigated. It has been assumed that the living chain‐end is polarized but non‐dissociated and relatively stable, therefore, i) shifting of the dissociation equilibrium by adding salts with common or non‐common anion in excess, and ii) increasing of the stability of the chain‐end by complexing it with electrondonors, may increase the livingness of the system. Indeed, the addition of n ‐Bu 4 NCl or n ‐Bu 4 NI to systems with BCl 3 or TiCl 4 coinitiators, as well as the addition of dimethyl sulphoxide as electrondonor in a broad concentration range, improved the living character. The possibility of complexation of the chain‐end by the monomer has also been supported