TY - JOUR A1 - Turky, Gamal A1 - Wolff, Dietmar A1 - Schönhals, Andreas T1 - Confinement effects on the molecular dynamics of liquid-crystalline polymethacrylates - a broadband dielectric spectroscopy study JF - Macromolecular chemistry and physics N2 - The molecular dynamics of liquid-crystalline polymethacrylates with biphenyl in the side group forming a highly ordered smectic E phase at low temperatures is investigated by dielectric spectroscopy (DS). Although no glass transition is found by DSC, DS detects a relaxation in the smectic E phase resembling to glassy dynamics. The temperature dependence of its relaxation rate is Arrhenius like at low temperatures, which changes to a VFT law at higher temperatures. Such a behavior is found to be characteristic for glassy dynamics in confining space. It is discussed, considering the structure of the polymers as nanobiphasic consisting of liquid-crystalline layers while the backbones fill the interlayer space. A comparison is made to polymethacrylates having phenyl benzoate as mesogen. KW - Dielectric properties KW - Dynamics in confining space KW - Liquid-crystalline polymers KW - Molecular dynamics PY - 2012 DO - https://doi.org/10.1002/macp.201200361 SN - 1022-1352 SN - 1521-3935 VL - 213 IS - 22 SP - 2420 EP - 2431 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-27129 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -