Global conformations of chiral polyisocyanates in dilute solution

Hong Gu, Yo Nakamura, Takahiro Sato, Akio Teramoto, Mark M. Green, C. Andreola

Research output: Contribution to journalArticle

Abstract

Global conformations of chiral polyisocyanates were discussed in terms of light scattering and viscosity data collected for stereospecifically deuterated poly(hexyl isocyanate)s, poly((R)-2,6-dimethylheptyl isocyanate) (PNIC), and copolymers of hexyl isocyanate (HIC) with (R)-2,6-dimethylheptyl isocyanate (NIC). The light scattering data and viscosity data obtained were analyzed consistently in the framework of the worm-like chain model. The persistence length q was the same for PHIC and deuterated PHIC, but increased with the mole fraction of NIC in the HIC-NIC copolymers, e.g. from 41 to 56 nm in hexane at 25°C. The results were not detailed enough to substantiate the broken worm model in line with the helix reversal model of Lifson et al. Gel permeation chromatographic behavior of the polyisocyanates was also examined, so that it could be used for the determination of the molecular weight distribution of a sample with a very minute amount (at most 1 mg or less).

Original languageEnglish (US)
Pages (from-to)849-856
Number of pages8
JournalPolymer
Volume40
Issue number4
StatePublished - 1998

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Isocyanates
Polyurethanes
Conformations
Light scattering
Copolymers
Viscosity
Molecular weight distribution
Hexane
Permeation
Gels
Hexanes

Keywords

  • Conformation
  • Persistence length
  • Worm-like chain

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

Cite this

Gu, H., Nakamura, Y., Sato, T., Teramoto, A., Green, M. M., & Andreola, C. (1998). Global conformations of chiral polyisocyanates in dilute solution. Polymer, 40(4), 849-856.

Global conformations of chiral polyisocyanates in dilute solution. / Gu, Hong; Nakamura, Yo; Sato, Takahiro; Teramoto, Akio; Green, Mark M.; Andreola, C.

In: Polymer, Vol. 40, No. 4, 1998, p. 849-856.

Research output: Contribution to journalArticle

Gu, H, Nakamura, Y, Sato, T, Teramoto, A, Green, MM & Andreola, C 1998, 'Global conformations of chiral polyisocyanates in dilute solution', Polymer, vol. 40, no. 4, pp. 849-856.
Gu H, Nakamura Y, Sato T, Teramoto A, Green MM, Andreola C. Global conformations of chiral polyisocyanates in dilute solution. Polymer. 1998;40(4):849-856.
Gu, Hong ; Nakamura, Yo ; Sato, Takahiro ; Teramoto, Akio ; Green, Mark M. ; Andreola, C. / Global conformations of chiral polyisocyanates in dilute solution. In: Polymer. 1998 ; Vol. 40, No. 4. pp. 849-856.
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AU - Andreola, C.

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