- 學位論文
側鏈鐵電性液晶聚環氧丙烷之合成及性質研究(VIII)
Studies on the Synthesis and Properties of Ferroelectric Side Chain Liquid Crystalline Polyoxetane(VIII)
摘要
本研究之目的在合成一系列具旋光性的側鏈型鐵電性液晶。此系列以環氧丙烷（HMMO）當作主鏈，以寡氧乙烯基（oligooxyethylene）為柔軟間距，末端以酯基連接具有旋光性之異山梨糖醇（isosorbide）。本系列液晶單體與其中間體以BF3．OEt2作為起始劑，進行開環聚合或共聚合合成聚合物。此系列的液晶單體及其聚合物以FTIR及NMR進行分析確認結構，再以微差掃描卡計（DSC）、含加熱裝置之偏光顯微鏡分析鑑定識別所含液晶相種類及溫度範圍。 研究結果發現：在單體時，隨著寡氧乙烯基間隔鏈的增加而有降低熔點的趨勢。所有液晶聚合物皆為雙變式液晶，但因異山梨糖醇體積之龐大，分子間之不易堆疊成二維方向整齊，使得所有單體與聚合物皆沒有SC*液晶相的呈現，但大多數都呈現N*液晶相。
並列摘要
A series of novel ferroelectric liquid crystalline (FLC) monomers and their corresponding side chain homopolymers and copolymers were synthesized in this study. One series of homopolymers and three series of copolymers were polymerized, containing the same polyoxetane as the backbone, oligooxyethylene as the flexible spacer, and ester group as the terminal linkage. Isosorbide was used as the chiral moiety. One series of homopolyoxetanes were prepared by above FLC monomers using BF3．OEt2 as an initiator. Three other seies of copolyoxetanes were also prepared in similar way by using FLC monomers with four intermediates. These obtained monomers, homopolymers and copolymers were characterized by using FT-IR, NMR, polarized microscope with a heating stage, and differential scanning calorimeter (DSC). The following results were found: (1) the melting points of the obtained monomers decrease with increasing the length of the flexible spacer. (2) All the polymers were identified as the enantropic liquid crystal. (3) The texture of chiral smectic C phase for all the monomers and polymers were not observed but most of them were observed N* phase. This is due to the bulky volume of isosorbide hard to stack in two dimensional order.
參考文獻
延伸閱讀
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