Synthesis and Investigation of T-shaped and Rod-like Liquid Crystal Materials with Branched Alkyl Chain and Swallow-Tailed Chiral Groups

• Main Authors: Chih-Hsuan Chang, 張誌軒
• Other Authors: Chiung-Cheng Huang
• Format: Others
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/35313045050259160597

碩士 === 大同大學 === 化學工程學系(所) === 100 === This study is divided into three parts, to study the mesomorphic properties of the T-shaped and rod-like liquid crystals with chiral swallow-tail derived from optically active (S)-lactic acid by changing chiral alkyl chain length. In addition, binary mixtures prepared from different rod- like liquid crystals are investigated. In the first part, the results of all of T-shaped compound Tmn with various alkyl chain length of swallow tail exhibit only SmA* mesophases. In the second part, when extending the alkyl chain length of chiral greater than 2, the N* and TGBA* phase formation is suppressed for rod-like series of compound 1Cmn. The third part of the works was to investigate the binary mixture materials. Thus, binary mixtures (TC31 and TNLC3, TC31 and 5CB) with the weight percentage ratios were prepared to investigate the formation of mesophases. Compound TC31 mixed with TNCL3 or 5CB causes the formation of frustrated BP and TGB phases. The wider temperature range of blue phase appeared at the 1:1 ratio of TC31 and 5CB about 3.8°C.