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The Effect of Flexible Spacers on the H-Shaped Dimesogenic Liquid Crystalline Compounds
The Effect of Flexible Spacers on the H-Shaped Dimesogenic Liquid Crystalline Compounds
Journal of the Korean Chemical Society. 2001. Dec, 45(6): 562-569
  • Published : December 00, 2001
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Park, Joo Hoon
Lee, Hwan Myoung
Choi, Ok Byung
Lee, Chang Joon
So, Bong Keun
Lee, Soo Min

Abstract
A homologous series of new H-shaped twin liquid crystal molecules (PPPA-n) with flexible spacers, oxypolymethyleneoxy, has been prepared by esterification of acid chloride of $\alpha$,$\omega$-bis(2,5-dicar-boxyphenoxy) alkanes with p-phenylphenol. The length of spacer was varied from oxyethyleneoxy (n=2) to oxydecamethyleneoxy (n=10). Their thermodynamic data were measured by differential scanning calorimetry and liquid crystalline properties were investigated by a hot-stage polarizing microscope.????????��??ا??????��?????????��?????Ӳ????��??????????��?????????����?��???????��?????????����?��????????��??????????????????????����????????����??��?��??��??��?