Abstract
AbstractLiquid crystalline block copolymers that incorporate both PHTH‐6 mesogenic units and polycarbonate (PC) segments in the main chain were synthesized by polycondensation in solution of hydroxyl‐terminated PC and acid‐chloride‐terminated PHTH‐6. The copolymer compositions were determined from 1H‐NMR data. The structure, thermal properties, as well as liquid crystalline behavior of the block copolymers were characterized by 1H‐NMR, Fourier transform infrared (FTIR), differential scanning calorimetry (DSC), polarizing optical microscopy (POM), transmission electron microscopy (TEM), and X‐ray scattering, etc. A novel kind of morphology of a liquid crystalline block copolymer, a feathery structure, was observed for the first time, in which the PHTH‐6 mesogenic microphase dispersed in the PC microdomain in the form of feathery structure. These block copolymers showed a microphase‐separation system, for which the geometry on a length scale changes from tens of nanometers to 600 nm and the degree of phase separation was strongly dependent on the segment lengths incorporated. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 283–294, 2002; DOI 10.1002/app.10318
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