M. Lee et al., LIQUID-CRYSTALLINE ASSEMBLY OF A DIBLOCK ROD-COIL POLYMER-BASED ON POLY(ETHYLENE OXIDE) AND ITS COMPLEXES WITH LICF3SO3, Macromolecules, 29(17), 1996, pp. 5567-5573
The rod-coil polymer of ethyl xy-4-biphenylylcarbonyloxy]-4'-biphenylc
arboxylate with poly(ethylene oxide) with a degree of polymerization o
f 12 (12-4) was observed to exhibit a microphase-separated lamellar st
ructure with nanoscale dimension and to melt into a layered smectic A
mesophase. The complexes of 12-4 with 0.05-0.8 mol of LiCF3SO3 per eth
ylene oxide unit of a molecule were also prepared in order to investig
ate mesomorphic phase changes of 12-4 upon complexation. An abrupt mes
ophase change was observed for the entire range of salt concentrations
. The complexes with 0.05-0.2 mol of LiCF3SO3 display an enantiotropic
smectic A phase as their highest temperature mesophase. From the comp
lex with 0.2 mol of LiCF3SO3, an enantiotropic cubic phase is induced
and a smectic A phase disappears at the complex with 0.25 mol of LiCF3
SO3, which displays a cubic mesophase only. The complex with 0.3 mol o
f LiCF3SO3 also exhibits an enantiotropic cubic phase; however, it exh
ibits a cylindrical micellar mesophase as its highest temperature meso
phase, contrary to the complexes with up to 0.25 mol of LiCF3SO3. The
complexes with 0.4-0.7 mol of LiCF3SO3 exhibit only a cylindrical mice
llar mesophase, and the complex with higher salt concentration becomes
amorphous. These results, characterized by a combination of different
ial scanning calorimetry, optical polarized microscopy, and X-ray scat
tering experiments, are discussed.