• Thermotropic Liquid Crystalline Behavior of Hydroxypropyl Celluloses Bearing Cholesteryl and Nitroazobenzene Groups
  • Jeong SY, Ma YD
  • 콜레스테릴과 니트로아조벤젠 그룹을 지닌 히드록시프로필 셀룰로오스들의 열방성 액정 거동
  • 정승용, 마영대
Abstract
Three kinds of hydroxypropyl cellulose(HPC) derivatives: 6-(cholesteryloxycarbonyl) pentoxypropyl celluloses(CHPCs) with degree of esterification(DE) ranging from 0.6 to 3, 6-[4-{4′-(nitrophenylazo)phenoxycarbonyl}]pentoxypropyl celluloses (NHPCs) with DE ranging from 0.4 to 3, and fully 6-(cholesteryloxycarbonyl)pentanoated NHPCs(CNHPCs) were synthesized, and their thermotropic liquid crystalline properties were investigated. All the CHPCs and NHPCs with DE≤1.7 formed enantiotropic cholesteric phases, whereas CNHPCs with 6-cholesteryloxycarbonyl)pentanoyl DE(DEC) more than 1.6 exhibited monotropic cholesteric phases. On the other hand, NHPCs with DE≥2.4 and CNHPCs with DEC≤1.3 showed monotropic nematic phases. NHPCs with DE≤1, as well as HPC, formed right-handed helices whose optical pitches(λm's) increase with temperature, while all the CHPCs formed left-handed helices whose λm's decrease with temperature. In contrast with these derivatives, NHPCs with 1.4≤DE≤1.7 and CNHPCs with DEC≥1.6 did not display reflection colors over the full cholesteric range, suggesting that the helical twisting power of the cellulose chain and the cholesteryl group highly depends on the chemical structure and DE of mesogenic group.

세 종류의 히드록시프로필 셀룰로오스(HPC) 유도체들, 즉 에스터화도(DE)가 0.6에서 3의 범위에 있는 6-(콜레스테릴옥시카보닐)펜톡시프로필 셀룰로오스들(CHPCs), DE가 0.4에서 3의 범위에 있는 [6-4-{4′-(니트로페닐아조)펜옥시카보닐}]펜톡시프로필 셀룰로오스들(NHPCs) 그리고 완전치환 6-(콜레스테릴옥시카보닐)펜타노화 NHPCs(CNHPCs)들을 합성함과 동시에 이들의 열방성 액정 특성들을 검토하였다. 모든 CHPCs 그리고 DE≤1.7인 NHPCs는 쌍방성 콜레스테릭 상들을 형성하는 반면 6-(콜레스테릴옥시카보닐)펜타노일 DE (DEC)가 1.6이상인 CNHPCs는 단방성 콜레스테릭 상들을 형성하였다. 한편, DE≥2.4인 NHPCs 그리고 DEC≤1.3인 CNHPCs는 단방성 네마틱 상들을 형성하였다. HPC와 동일하게, DE≤1인 NHPCs는 온도상승에 의해 광학피치들(λm's)이 증가하는 우측방향의 나선구조를 형성하는 반면 모든 CHPCs는 온도상승에 의해 λm들이 감소하는 좌측방향의 나선구조를 형성하였다. 이들 유도체와 달리, 1.4≤DE≤1.7인 NHPCs 그리고 DEC≥1.6인 CNHPCs는 콜레스테릭 상의 전 범위에서 반사 색깔을 나타내지 않았다. 이러한 사실은 셀룰로오스 사슬 그리고 콜레스테릴 그룹에 의한 나선의 비틀림력은 mesogenic 그룹의 화학구조와 DE에 민감하게 의존함을 시사한다.

Keywords: hydroxypropyl cellulose; cholesterol; nitroazobenzene; degree of esterification; temperature dependence of optical pitch; helical sense

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This Article

  • 2008; 32(5): 446-457

    Published online Sep 25, 2008

  • Received on May 8, 2008
  • Accepted on Jul 16, 2008