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Synthesis via ATRP and Anchoring Properties of Ammonium‐Terminated Monofunctional or Telechelic Polystyrenes
Author(s) -
Toquer Guillaume,
Monge Sophie,
Antonova Krassimira,
Blanc Christophe,
Nobili Maurizio,
Robin JeanJacques
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.200600475
Subject(s) - polystyrene , polymer chemistry , atom transfer radical polymerization , telechelic polymer , polymer , bipyridine , chemistry , end group , radical polymerization , anisole , polymerization , catalysis , materials science , organic chemistry , crystal structure
Mono‐ and di‐(trimethylammonium)‐terminated polystyrenes with similar molar masses were synthesized. Bromopolystyrenes were first prepared by atom transfer radical polymerization (ATRP) using ( N ‐Boc‐propylamino)‐2‐bromoisobutyrate as initiator and Cu(I)Br/2,2′‐bipyridine as catalytic system in bulk at 110 °C. α , ω ‐Telechelic polymer with double molecular weight with respect to the starting polystyrene was then obtained under atom transfer radical coupling process using 2,2′‐bipyridine and copper(0) mediated reductive conditions in anisole. Final (trimethylammonium)‐terminated polystyrenes were eventually obtained after removal of the tert ‐butyloxycarbonyl group and permethylation reactions. Intermediate and final polymers were characterized by 1 H NMR. The aligning properties of the obtained polymers for liquid crystals have been investigated. Pretilt and zenithal anchorings on ITO/glass substrates were measured. Finally, the possibility for the telechelic polystyrene to form a network in an inverted microemulsion was also considered.