Premium
Synthesis of linear and three‐arm star tert ‐chlorine‐telechelic polyisobutylenes by a two‐step conventional laboratory process
Author(s) -
Feldthusen Jesper,
Iván Béla,
Müller Axel H. E.,
Kops Jørgen
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.1997.030180509
Subject(s) - polymer chemistry , telechelic polymer , star polymer , star (game theory) , end group , chemistry , polymer science , materials science , organic chemistry , mathematics , copolymer , mathematical analysis , polymer
A two‐step conventional laboratory process was developed for the synthesis of mono‐ and difunctional linear and three‐arm star tert ‐chlorine‐telechelic polyisobutylenes (PIB) with desired molecular weights (MW) and narrow molecular weight distribution (MWD) by living carbocationic polymerization (LCCP). This polymerization method applies easy to handle operations and chemicals. LCCP of isobutylene (IB), was carried out in CH 2 Cl 2 as solvent and with BCl 3 as coinitiator in the first step to obtain soluble low MW PIB prepolymer with narrow MWD. This was followed by addition of hexane, TiCl 4 and additional monomer in the second step to prepare PIBs with desired MW and narrow MWD in practically any suitable MW region. Comparison of the one‐step and two‐step processes is also described.