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

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)3394-3400
Number of pages7
JournalMacromolecules
Volume28
Issue number9
DOIs
Publication statusPublished - Apr 1 1995

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Polymers
Polymerization
Crystalline materials
Liquids
Viscosity measurement
Chain length
Light scattering
Superconducting transition temperature
Entropy
Thermodynamic properties
Temperature

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Orientation-Dependent Interactions in Polymer Systems. 5. Thermotropic Liquid Crystalline Transition of Tri-O-heptylcellulose. / Takada, Akihiko; Fukuda, Takeshi; Watanabe, Junji; Miyamoto, Takeaki; Takada, Akihiko; Watanabe, Junji.

In: Macromolecules, Vol. 28, No. 9, 01.04.1995, p. 3394-3400.

Research output: Contribution to journalArticle

Takada, Akihiko ; Fukuda, Takeshi ; Watanabe, Junji ; Miyamoto, Takeaki ; Takada, Akihiko ; Watanabe, Junji. / Orientation-Dependent Interactions in Polymer Systems. 5. Thermotropic Liquid Crystalline Transition of Tri-O-heptylcellulose. In: Macromolecules. 1995 ; Vol. 28, No. 9. pp. 3394-3400.
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