| Summary: | 碩士 === 淡江大學 === 化學學系碩士班 === 103 === According to lab member’s study results, introducing fluorine atoms at outside position on one of side chains in hexakis(phenylethynyl)benzene can reduce the temperature of the liquid crystal (LC) form, but the liquid crystal type is columnar, it has high order and viscosity, not suitable for display materials. In order to increase the intramolecular steric hindrance effect, I change the fluorine atoms to inside position to lower the order between molecules and form room temperature discotic nematic.
I successfully synthesis the near room temperature (40 °C) discotic nematic and compare to above-mentioned columnar, it would not decomposed near clear point. In the other hand, introduce two fluorine atoms at inside position could caused homeotropic orientation than single fluorine atom.
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