| 초록 |
Phase behaviors of side chain liquid crystalline polymers, (tetradecylsulfonyl) methyl-substituted polyoxyethylene (14SEO), (hexadecylsulfonyl) methyl-substituted polyoxyethylene (16SEO) and (octylsulfonylhexylthio) methyl-substituted polyoxyethylene (8S6EO), were studied by differential scanning calorimetry (DSC), polarized optical microscopy (POM), FT-IR, small and wide angle x-ray scattering (SAXS and WAXS) and rheometry. POM showed that all the samples synthesized had ordered smectic phases at room temperature. From SAXS measurements, it was found that the layer thickness of the smectic phase corresponds to twice the extended side chain length. Above the isotropization temperature (Ti), no scattering peaks were observed for 8S6EO, while broad scattering peaks were still persistent for both 14SEO and 16SEO. It is believed that the broad peak above the Ti is related to the characteristic block copolymer-like correlation hole peak in the homogeneous state. On the basis of the SAXS results, rheological measurements were also performed in order to identify whether Ti of 14SEO and 16SEO were related to the order-disorder transition (ODT). |
