Orientation-Dependent Interactions in Polymer Systems. 5. Thermotropic Liquid Crystalline Transition of Tri-O-heptylcellulose

Akihiko Takada, Takeshi Fukuda, Junji Watanabe, Takeaki Miyamoto, Akihiko Takada, Junji Watanabe

研究成果: Contribution to journalArticle査読

22 被引用数 (Scopus)

抄録

Fairly narrow fractions of tri-O-heptylcellulose (THC) covering a wide range of degrees of polymerization (DP) were prepared and studied by viscometry and light scattering to determine the wormlike model parameters of the polymer to be q = 43.2 exp(-0.0050T) nm and ML = 880 nm-1, where q is the persistence length, ML is the shift factor, and T is the absolute temperature. The same fractions were studied with their thermal properties to determine the anisotropic-isotropic transition temperature Ti and transition entropy ΔS as a function of DP. Both Ti and ΔS increased with increasing DP to approach a limiting value for large enough DP. These trends were favorably compared with the predictions of the statistical models with the above-noted parameter values. It was shown that the main factor that causes the thermotropic transition and the chain-length dependence of Ti in bulk THC is the temperature-dependent flexibility of the polymer.

本文言語英語
ページ(範囲)3394-3400
ページ数7
ジャーナルMacromolecules
28
9
DOI
出版ステータス出版済み - 4 1 1995
外部発表はい

All Science Journal Classification (ASJC) codes

  • 有機化学
  • ポリマーおよびプラスチック
  • 無機化学
  • 材料化学

フィンガープリント

「Orientation-Dependent Interactions in Polymer Systems. 5. Thermotropic Liquid Crystalline Transition of Tri-O-heptylcellulose」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル