Article
  • Thermal and Cholesteric Mesophase Properties of Hydroxypropyl Celluloses and (Butoxypropyl)celluloses
  • Jeong SY, Ma YD
  • 히드록시프로필 셀룰로오스들 그리고 (부톡시프로필)셀룰로오스들의 열 및 콜레스테릭 상의 특성
  • 정승용, 마영대
Abstract
Nine kinds of hydroxypropyl celluloses (HPCs) with degree of substitution (DS) and molar substitution (MS) ranging from 2.10 to 2.71 and 2.3 to 6.7, respectively and seven kinds of fully butanoated HPCs (BPCs) based on the HPCs with 2.3 ≤ MS ≤ 6.7 were synthesized, and the molecular characteristics of HPCs and the thermotropic liquid crystalline properties of the derivatives were investigated. MS was nearly equal to DS for small value of DS, but it became exceedly larger than DS for DS 1, showing that in the later stages of reaction, propylene oxide preferentially adds to the side chains rather than the main chain. All the derivatives formed enantiotropic cholesteric phases with right-handed helical structures. The glass and clearing transition temperatures of both HPCs and BPCs were decreased with increasing MS. The optical pitches (λm's) of BPCs, as well as HPCs themselves, increased with increasing temperature. However, the λm's of both HPCs and BPCs at the same temperature increased with increasing MS. Moreover, the temperature dependence of λm of HPCs was weaker than that of BPCs, suggesting that the helical twisting power of the cellulose chain highly depends on the length and chemical structure of the side chain introduced in cellulose chain.

치환도(DS) 그리고 몰치환도(MS)가 각각 2.10∼2.71 그리고 2.3∼6.7 범위에 있는 9종류의 히드록시프로필셀룰로오스들(HPCs) 그리고 2.3 ≤ MS ≤ 6.7인 HPC들을 이용하여 7종류의 완전치환 부타노화 HPCs(BPCs)를 합성함과 동시에 HPC들의 분자특성과 유도체들의 열방성 액정 특성을 검토하였다. DS가 작은 범위에서는 MS와 DS는 거의 동일하였다. 그러나, DS 1인 범위에서는 DS에 비해 MS는 대단히 큰 경향을 나타냈다. 이러한 사실은 반응이 진행됨에 따라 프로필렌 옥사이드는 주사슬보다는 곁사슬들에 우선적으로 부가됨을 시사한다. 모든 유도체들은 우측방향의 나선구조를 지닌 쌍방성 콜레스테릭 상들을 형성하였다. HPC들 그리고 BPC들의 유리전이 그리고 액정 상에서 액체 상으로 전이온도들은 MS가 증가함에 따라 낮아졌다. HPC 자체들과 동일하게 BPC들의 광학피치들(λm's)은 온도가 상승함에 따라 증가하였다. 그러나, HPC들 그리고 BPC들이 동일한 온도에서 나타내는 λm들은 MS가 증가함에 따라 증가하였다. 또한, HPC들이 나타내는 λm의 온도의존성은 BPC의 경우에 비해 약하였다. 이러한 사실은 셀룰로오스 사슬에 의한 나선의 비틀림력은 셀룰로오스 사슬에 도입된 곁사슬의 길이와 화학구조에 민감하게 의존함을 시사한다.

Keywords: hydroxypropyl cellulose; (butoxypropyl)cellulose; degree of substitution and molar substitution; temperature dependence of optical pitch.

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
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This Article

  • 2009; 33(3): 254-262

    Published online May 25, 2009

  • Received on Jan 7, 2009
  • Accepted on Apr 30, 2009