| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 | 30권 2호 |
| 발표분야 | 고분자 구조 및 물성 |
| 제목 | Terminal Alkyl Group Effect on Phase Behavior of Rod-Coil Molecules |
| 초록 | We studied the effect of the coil length and the terminal alkyl group in the rod part on the thermotropic liquid crystal phase behavior of a rod-coil molecule: alkyl 4-[4-[oxypoly(propyleneoxy)-propyloxy]-4’-biphenylcarboxyloxy]4’-biphenylcarboxylate with a varying length of poly(propylene oxide) coil. The terminal alkyl group was either ethyl or methyl group. The rod-coil molecules were fractionated by temperature gradient interaction chromatography into truly monodisperse molecular species and the thermal phase transition behavior of the fractionated samples was investigated by differential scanning calorimetry, polarized optical microscopy and X-ray scattering. Although it was expected to observe a significant effect of the coil length on the thermotropic phase behavior in crystalline as well as in mesophase states, it was rather surprising to find a far more significant effect of the terminal alkyl group in the rod part. A small change from ethyl to methyl ester results in a dramatic change not only in the transition temperature but also in the structure of the mesophases. |
| 저자 | 김노선, 박인선, 장태현 |
| 소속 | 포항공과 대 |
| 키워드 | rod-coil molecule; liquid crystal phase behavior; terminal alkyl group effect; temperature gradient interaction chromatography; X-ray scattering |
