Dynamic mechanical and thermal behavior of novel liquid-crystalline polybutadiene-diols with azobenzene groups in side chains

Abstract

SynopsisLiquid-crystalline (LC) polymers containing methoxy-or butoxy-substituted azobenzene in side chains have been prepared via radical addition of the in advance synthesized nematic thiols onto double bonds of poly(butadiene)diol [Polakova et al., Pol. Bull. 54, 315-326 (2010)]. In the present work, thermal behavior of these comblike polymers has been characterized by differential scanning calorimetry and polarizing optical microscopy. LC transitions have been also determined by rheological measurement. Time-temperature superposition of mechanical functions has been successfully applied to samples undergoing direct nematic/glassy state transition. V C 2013 The Society of Rheology. [http://dx

(Meth)acrylate liquid crystalline polymers for membrane applications

“…Unfortunately, heating linear LCP membranes above the glass transition ( T g ) and into the LC or isotropic states increases polymer mobility, which results in an undesirable decrease in the loss and storage moduli . This results in a decrease in membrane stability, resulting in an inability to withstand the pressure gradients used in gas separation applications.…”