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Hemiphasmidic Side-Chain Liquid Crystalline Polymer: From Smectic C Phase to Columnar Phase with a Bundle of Chains as Its Building Block
Hemiphasmidic Side-Chain Liquid Crystalline Polymer: From Smectic C Phase to Columnar Phase with a Bundle of Chains as Its Building Block
We synthesized a new hemiphasmidic side-chainliquid crystalline polymer (P-n, n is the number of carbons in alkytail of the side chain, n = 4?12) using free radical polymerization.The side chain of P-n has a biphenyl in the middle, linked to thepolystyrene backbone and to the terminal phenyl group with threealkyl tails via only methyleneoxy units. Upon increasing n, themesophase of P-n changes from bilayer smectic C to hexagonalcolumnar (Φh) phase with the a-dimension of ～6 nm. Both of the
mesophases are long-range ordered, which can be well aligned bysimple shearing. The oriented Φh shows a quite low rotationaldisorder around the shear direction. Most likely, the Φh phasetakes a bundle of chains (e.g., ～five chains) rather than a single chain as its building block. This “multi-chain model” of theΦh phase may represent a new type of self-assembly in side-chain polymers.
