Abstract
A preliminary study on the influence of gas sorption on the surface and the bulk properties of a liquid crystalline (LC) side-group polyacrylate PAC-6 is reported. For the first time the gas-induced enrichment of mesogenic side groups at the surface is observed, while the reproducible temperature-scanning surface tension in the high viscous smectic phase is enabled through the plasiticization of gas. Selected experiments demonstrate that the gas-influenced surface and bulk properties of the LC polymer are widely comparable with those of low-molecular-weight ones. The surface tension and the phase transitions depend strongly on the LC phase state, temperature, gas type and gas pressure. At higher pressures, the CO2-induced pretransitional surface excess order is confirmed in the nematic and isotropic phases of PAC-6. Furthermore, our experiments imply a reversible, physical gas sorption in PAC-6.
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