摘要
本研究主要是以合成一系列2, 4, 6-三苯基-1,3,5-三衍生物為液晶材料之化合物，探討不同側鏈基對液晶相的生成是否有影響，最後再藉由偏光顯微鏡 (POM) 、微差式掃瞄卡計 (DSC)、與粉末變溫x-ray繞射儀(XRD) 來鑑定液晶相的種類。
本論文主要探討分兩部份：第一部份是以2, 4, 6-三苯基-1, 3, 5-三化合物為剛性核心並接上不同軟端側鏈基，來探討液晶相是否生成。第二部份，依舊以2, 4, 6-三苯基-1, 3, 5-三化合物為剛性核心，並於核與側鏈基之間多增加一層苯酯基，來研究其結構與液晶生成之關係。
結果發現，以單純2, 4, 6-三苯基-1, 3, 5-三結構直接接上不同官能基時，則不管側鏈基是否為含氧醚類、長碳鏈或含立障之側鏈取代基，皆沒有發現任何的液晶相生成。但於第二部份，則成功地利用苯酯基的效應，再輔以不同鏈長之烷基或烷氧基，並且順利地得到向列型盤狀液晶 (ND) 產物，此化合物在偏光顯微鏡下，發現具有極佳的流動性質，乃完全符合向列型液晶之特性。

Abstract
The synthesis、characterization, and mesomorphic properties of a new class of heteronuclear compounds derivative from 2, 4, 6-triphenyl-1, 3, 5-triazine was as a core group, The compounds were prepared by condensation reaction of benzonitrile in the presence of chlorosulfonic acid。
Two types of liquid crystalline molecules were investigated:
(1) The number of flexible side chains were connected to a 1, 3, 5-triazine ring, each of R group, which used the alkoxy side chains、or different side chains of ether and bulkyl of the alkoxy. However, all these compounds with different side chains showed no mesophases, only crystal to liquid transition.
(2) Conversely, the second molecule was benzoate attached between a rigid core group and alkoxy or alkyl side chains. The side chain length was made of 1, 3, 5-triazine ring derivatives that had been six side chains and peripheral pentyl to octyl group tails have liquid crystal properties, respectively. In this work a series of structurally similar compounds in which the carbon on the side chain are replaced by oxygen atom were prepared, and their mesomorphic properties were studied. These compounds with pentyloxy to heptyloxy flexible side chains exhibited ND phase。
The liquid crystalline behaviour of these compounds with benzoate attached to a 1, 3, 5-triazine ring derivative were studied by thermal analysis (DSC), polarizing optical microscopy (POM) and powder X-ray
diffraction (XRD).

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