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제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Synthesis and characterization of liquid crystaillne epoxy containing cyano biphenyl moieties as a mesogen

2019년 8월 26일 17시 35분 06초
ORGN.P-420 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 18일 (금요일) 11:00~12:30
Organic Chemistry
저자 및
Soyeong Choe, Hyeonuk Yeo1,*
Department of Chemistry, Kyungpook National University, Korea
1Department of Chemistry Education, Kyungpook National University, Korea
These days, devices such as laptops, smartphones, and AirPods are having more function and smaller in size to make our life easier. Because of these properties, heat from the devices has increased, which reduces the reliability of the device. Therefore, there is a need for a heat dissipating material that efficiently transfers the generated heat. In the materials as a matrix, a liquid crystal epoxy resin (LCER) having strong adhesion to the inorganic filler is often selected. In this research, we tried synthesizing a new liquid crystal epoxy resin having cyano biphenyl (CBs) structure as a mesogen. The synthetic procedures were conducted in two step reactions. In the first reaction, the intermediate compounds, terminal bromoalkoxy-(1,1'-biphenyl)-4-carbonitrile, were synthesized using SN2 reaction between 4'-hydroxy-(1,1'-biphenyl)-4-carbonitrile and terminal dibromoalkane (carbon number, n=4,5,6,7,8,9). Next reactions were carried out by substitution reaction of the intermediates to glycidol to obtain epoxy monomers with various alkyl linkages. The final compounds were characterized by 1H NMR analysis. The differential scanning calorimetry (DSC) and polarized optical microscope (POM) were used to investigate their liquid crystalline properties. In DSC measurements, the curves showed heat flow changes at specific temperatures that occurred as phase transitions from solids to liquid crystals and from liquid crystals to isotropic liquids. And the liquid crystal phases could be observed by POM analysis. The details will be presented.