Mesogen-jacketed liquid crystalline polymers via stable free radical polymerization

TitleMesogen-jacketed liquid crystalline polymers via stable free radical polymerization
Publication TypeJournal Article
Year of Publication1999
AuthorsGopalan, P, Pragliola, S, Ober, CK, Mather, PT, Jeon, HG
JournalPolymer Preprints (American Chemical Society, Division of Polymer Chemistry)
Volume40
Pagination372-373
ISBN Number0032-3934
Accession Number1999:558854
Keywordsbutylbenzoyloxystyrene liq crystal polymer prepn radical mechanism, Glass transition, Liquid crystals, mesogen jacketed butylbenzoyloxystyrene liq crystal polymer glass transition, Molecular weight distribution (prepn. and phase properties of mesogen-jacketed liq. cryst. poly(bis(butylbenzoyloxy)styrene) via stable free radical polymn.), phenylmethylpiperidinyloxyethane initiator radical polymn butylbenzoyloxystyrene, Polymer morphology (phase, Polymerization (radical, prepn. and phase properties of mesogen-jacketed liq. cryst. poly(bis(butylbenzoyloxy)styrene) via stable free radical polymn.)
Abstract

Stable free radical polymn. using 1-phenyl-1-(2,2,6,6-tetramethyl-1-piperidinyloxy)ethane as initiator was applied to the controlled synthesis of poly(2,5-bis[(4-butyl-benzoyl)oxy]styrene). This mesogen jacketed liq. cryst. polymer, has the mesogenic units attached directly to the backbone in a side-on mode, and can be classified as a main chain liq. cryst. polymer based on its phys. properties. The mol. wt. of the growing chain and the conversion of the monomer were well controlled with reaction time. The polymer consistently showed a narrow mol. wt. distribution (1.2 - 1.4). Compared to polymn. of styrene under nearly identical conditions, polymn. of 2,5-bis[(4-butyl-benzoyl)oxy]styrene showed significantly higher reaction rate and monomer conversion efficiency. A nematic mesophase was obsd. in the polymer glass transition to decompn. The mol. organization was detd. by WAXS. [on SciFinder(R)]