A distinct smectic C2 liquid crystal observed in main-chain liquid crystalline polymer
Résumé
We present experimental evidence for the formation of a smectic C2(SC2) phase in main-chain liquid crystalline polymers with the general repeat unit, (see the PDF version). The SC2 phase was identified by definitive observation using X-ray and optical methods and found to have a novel layered structure. The mesogenic groups in this phase are titled with respect to the layer normal, but unlike the SC phase the tilt direction is opposite in adjacent layers. This distinct structure is considered to arise from a coupling of polymeric and mesogenic effects in which the spatial orientation of mesogenic groups is controlled by the confined conformation of the polymer chain.
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