Y. Hepuzer et al., NEW SYNTHETIC APPROACH FOR THE SYNTHESIS OF LIQUID-CRYSTALLINE BLOCK AND GRAFT-COPOLYMERS, Turkish journal of chemistry, 21(4), 1997, pp. 286-295
Liquid crystalline block; and graft copolymers were synthesized accord
ing to the macroinitiator and macroinimer concept. For this purpose: s
ide chain block copolymers (polytetrahydrofuran-b-polymethylmethacryla
te), having liquid crystalline 4,4'-cyanobiphenyl blocks were prepared
and characterized. Unlike the liquid-crystalline homopolymer with mes
ogenic units in the side chain, all block and graft copolymers showed
a smectic A mesophase. The transition temperatures are hardly affected
by;the composition and molecular weight of the block copolymers.