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Gas‐influenced surface and bulk properties of a liquid crystalline side‐group polymer
Author(s) -
Chen GongHao,
Springer Jürgen
Publication year - 2000
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20000801)201:13<1552::aid-macp1552>3.0.co;2-v
Subject(s) - mesogen , surface tension , polymer , liquid crystal , sorption , side chain , chemistry , pendant group , phase (matter) , isotropy , polymer chemistry , chemical engineering , chemical physics , thermodynamics , materials science , adsorption , organic chemistry , liquid crystalline , optics , physics , optoelectronics , engineering
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 CO 2 ‐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.