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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
