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Copyright 2001 American Chemical Society). Lee et al. 67 All of the coil-rod-coil ABC triblock molecules (12) exhibit three different crystalline melting transitions associated with poly(ethylene oxide), docosyl, and rod blocks, respectively, as determined by DSC, indicative of phase separation among blocks. Interestingly, molecules with 22 to 34 ethylene oxide repeating units exhibit a hexagonal columnar mesophase which, in turn, undergoes transformation into discrete spherical micellar structure with a lack of symmetry (Figure 16).
However, the conductivities decrease in the polydomain sample which disturbs the arrangement of ion paths. These results suggest that the self-organized rod-coil salt complexes can provide access to a novel strategy to construct ordered nanocomposite materials exhibiting low dimensional ionic conductivity. Wu et al. 82 Styrene was polymerized by TEMPO mediated radical polymerization, followed by sequential polymerization of 2,5-bis[4-methoxyphenyl]oxycarbonylstyrene (MPCS) to produce the rod-coil diblock copolymer (20) containing 520 styrene and 119 MPCS repeating units.
Scanning force microscopy (SFM) revealed the formation of nonspherical micelles with axes of about 10 and 14 nm, corresponding to an aggregate of about 60 rod-coil molecules, consistent with the results determined from GPC (Figure 29). The optical properties were shown to be consistent with those of corresponding unsubstituted oligothiophenes. Yu et al. 105 Four copolymers that have the same oligo(phenylene vinylene) block with different polyisoprene volume fractions were synthesized. TEM and small-angle X-ray scattering revealed alternating strips of rod-rich and coil-rich and coil-rich domains, and the domain sizes of the strips suggested that the supramolecular structures could be bilayer lamellar structure (Figure 30).