Polyisocyanates and the interplay of experiments and theory in the formation of lyotropic cholesteric states

Takahiro Sato, Yoshihiro Sato, Yoshimi Umemura, Akio Teramoto, Yoshikazu Nagamura, Jurgen Wagner, Dexi Weng, Yoshio Okamoto, Koichi Hatada, Mark M. Green

Research output: Contribution to journalArticle

Abstract

We have made the first observations of the lyotropic cholesteric liquid crystals state of polyisocyanates in which a synthetically controlled range of the dynamic excesses of one helical sense offer new opportunities for study in the area. In poly(R)-2, 6-dimethylheptyl isocyanate) we have generated the cholesteric lyotropic state and studied the pitch as function of solvent, temperature, and concentration. The nematic phase of the dynamically racemic poly(n-hexyl isocyanate) was doped with a derivative of a steroid and a menthol, and the resulting cholesteric pitch was studied as a function of temperature and dope concentration. The failure to fit these data to theoretical expectations applicable to intrinsically chiral polymers may be due to sensitivity of the helix sense ratio of the macromolecule to the chiral characteristics of the cholesteric phase.

Original languageEnglish (US)
Pages (from-to)4551-4559
Number of pages9
JournalMacromolecules
Volume26
Issue number17
StatePublished - Jan 1 1993

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Polyurethanes
Menthol
Cholesteric liquid crystals
Isocyanates
Macromolecules
Polymers
Experiments
Steroids
Derivatives
Temperature
poly(n-hexyl isocyanate)

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

Sato, T., Sato, Y., Umemura, Y., Teramoto, A., Nagamura, Y., Wagner, J., ... Green, M. M. (1993). Polyisocyanates and the interplay of experiments and theory in the formation of lyotropic cholesteric states. Macromolecules, 26(17), 4551-4559.

Polyisocyanates and the interplay of experiments and theory in the formation of lyotropic cholesteric states. / Sato, Takahiro; Sato, Yoshihiro; Umemura, Yoshimi; Teramoto, Akio; Nagamura, Yoshikazu; Wagner, Jurgen; Weng, Dexi; Okamoto, Yoshio; Hatada, Koichi; Green, Mark M.

In: Macromolecules, Vol. 26, No. 17, 01.01.1993, p. 4551-4559.

Research output: Contribution to journalArticle

Sato, T, Sato, Y, Umemura, Y, Teramoto, A, Nagamura, Y, Wagner, J, Weng, D, Okamoto, Y, Hatada, K & Green, MM 1993, 'Polyisocyanates and the interplay of experiments and theory in the formation of lyotropic cholesteric states', Macromolecules, vol. 26, no. 17, pp. 4551-4559.
Sato T, Sato Y, Umemura Y, Teramoto A, Nagamura Y, Wagner J et al. Polyisocyanates and the interplay of experiments and theory in the formation of lyotropic cholesteric states. Macromolecules. 1993 Jan 1;26(17):4551-4559.
Sato, Takahiro ; Sato, Yoshihiro ; Umemura, Yoshimi ; Teramoto, Akio ; Nagamura, Yoshikazu ; Wagner, Jurgen ; Weng, Dexi ; Okamoto, Yoshio ; Hatada, Koichi ; Green, Mark M. / Polyisocyanates and the interplay of experiments and theory in the formation of lyotropic cholesteric states. In: Macromolecules. 1993 ; Vol. 26, No. 17. pp. 4551-4559.
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AU - Wagner, Jurgen

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