Novel liquid-crystalline mesogens and main-chain chiral smectic thiol-ene polymers based on trifluoromethylphenyl moieties
作者:Hong Yang、Lixing Wang、Renfan Shao、Noel A. Clark、Josu Ortega、Jesus Etxebarria、Pierre-Antoine Albouy、David M. Walba、Patrick Keller
DOI:10.1039/b907907f
日期:——
The synthesis and characterization of a series of novel liquid-crystalline molecules containing a trifluoromethylphenyl core or a 2,3-bis(trifluoromethyl)phenyl core is described. All trifluoromethylphenyl-containing compounds (W530, W551, and W558) have mesomorphic properties while 2,3-bis(trifluoromethyl)phenyl-containing compounds (W555, W556, W557) are room-temperature crystals without mesophases. Thereafter, based on the chemical structure of W558, to pursue a mesogen with a large electroclinic effect in the SmA* phase for development into electromechanical actuators, a chiral smectic thiol-ene monomer (K0901) is synthesized and polymerized in organic solvents. The polymer is characterized by GPC, DSC, PLM, XRD and shows an expected I–SmA* –Glass phase sequence though the electroclinic effect is relatively small.
描述了一系列含有三氟甲基苯核心或2,3-双(三氟甲基)苯核心的新型液晶分子的合成与表征。所有含三氟甲基苯的化合物(W530、W551和W558)均具有介观性质,而含2,3-双(三氟甲基)苯的化合物(W555、W556、W557)则为室温晶体,无介观相。此后,基于W558的化学结构,为追求在SmA*相中具有大电场效应的介晶,以开发成机电致动器为目标,合成了手性近晶硫醇-烯单体(K0901)并将其在有机溶剂中聚合。通过GPC、DSC、PLM和XRD对该聚合物进行了表征,显示出预期的I-SmA*-玻璃相序列,尽管电场效应相对较小。