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Synthesis of liquid crystalline moiety containing N ‐cyclohexylmaleimide copolymers
Author(s) -
Yuksel M.,
Canak T. Cakir,
Serhatli I. E.
Publication year - 2009
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1269
Subject(s) - copolymer , polymer chemistry , monomer , materials science , maleimide , acrylate , atom transfer radical polymerization , polymerization , glass transition , polymer , methyl acrylate , radical polymerization , composite material
Atom transfer radical polymerization (ATRP) was applied to copolymerize liquid crystalline acrylate (6‐(4‐cyanobiphenyl‐4′‐oxy)hexyl acrylate) (LC6) monomer and N ‐cyclohexylmaleimide (NCMI) monomer. Copolymerization of LC6 and NCMI in the presence of Cu(I)Br/ N , N , N ′, N ′′, N ′′‐pentamethyldiethylene‐triamine (PMDETA) catalyst system using anisole as a solvent at 110°C initiated by 2‐bromopropionyl bromide afforded well‐defined copolymers. In addition, free radical polymerization (FRP) was applied using 2,2′‐azodiisobutyronitrile (AIBN) as an initiator in toluene at 70°C for the same monomers. The influences of several factors such as monomer ratio and time on the copolymerization, spectral, and thermal properties of resultant copolymers were investigated. The glass transition temperature and thermal stabilities of the copolymers were increased by increasing the N ‐substituted maleimide ( N ‐cyclohexylmaleimide) content. As a result, thermally stable liquid crystalline alternating copolymers were synthesized by introducing maleimide segments into the polymer. Copyright © 2008 John Wiley & Sons, Ltd.