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.

Mesogen-jacketed liquid-crystalline polymers via stable free-radical polymerization

PRAGLIOLA, Stefania;
1999

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.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/1061503
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