Following the polyisocyanate helix reversal from dilute solution through the liquid crystal and into the solid state

Mark M. Green, Takahiro Sato, Akio Teramoto, Shneior Lifson

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

The absence of a predetermined helical sense in the polyisocyanates causes the formation of helix reversals which enforce a strong cooperativity for the amplification of chiral effects. The helix reversals though also place a limit on this amplification, a limit which would be eliminated by reducing the helix reversal population. Approaching the liquid crystal state of the polyisocyanates in both dilute and concentrated solutions appears to cause the exclusion of the helix reversals which is consistent with theoretical expectations. Since the linear birefringence of the polyisocyanate solid state precludes optical activity measurements associated with the polymer, we have synthesized hydrogen bonding side chain adapted polyisocyanates which appear by DSC and infra-red criteria to form equilibrium molecular composites with copolymers of vinyl phenol and styrene. The optical activity properties of these composites may offer a new way to probe polymer motion in the solid state.

Original languageEnglish (US)
Title of host publicationMacromolecular Symposia
Pages363-370
Number of pages8
Volume101
StatePublished - Jan 1996

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Liquid Crystals
Polyurethanes
Liquid crystals
Amplification
Composite materials
Polymers
Birefringence
Phenols
Styrene
Hydrogen bonds
Copolymers
Infrared radiation
Phenol

ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics

Cite this

Green, M. M., Sato, T., Teramoto, A., & Lifson, S. (1996). Following the polyisocyanate helix reversal from dilute solution through the liquid crystal and into the solid state. In Macromolecular Symposia (Vol. 101, pp. 363-370)

Following the polyisocyanate helix reversal from dilute solution through the liquid crystal and into the solid state. / Green, Mark M.; Sato, Takahiro; Teramoto, Akio; Lifson, Shneior.

Macromolecular Symposia. Vol. 101 1996. p. 363-370.

Research output: Chapter in Book/Report/Conference proceedingChapter

Green, MM, Sato, T, Teramoto, A & Lifson, S 1996, Following the polyisocyanate helix reversal from dilute solution through the liquid crystal and into the solid state. in Macromolecular Symposia. vol. 101, pp. 363-370.
Green MM, Sato T, Teramoto A, Lifson S. Following the polyisocyanate helix reversal from dilute solution through the liquid crystal and into the solid state. In Macromolecular Symposia. Vol. 101. 1996. p. 363-370
Green, Mark M. ; Sato, Takahiro ; Teramoto, Akio ; Lifson, Shneior. / Following the polyisocyanate helix reversal from dilute solution through the liquid crystal and into the solid state. Macromolecular Symposia. Vol. 101 1996. pp. 363-370
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