Liquid-liquid equilibria of polyrotaxane and poly(vinyl alcohol)

Toshiyuki Kataoka, Yohei Nagao, Masatoshi Kidowaki, Jun Araki, Kohzo Ito

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Liquid-liquid equillibria (LLE) of the tertiary system of hydroxypropylated polyrotaxane (HPPR)-poly(vinyl alcohol) (PVA)-solvent have been investigated by focusing on the internal structures of HPPR-PVA blend gels. The phase diagrams of the HPPR-PVA aqueous systems displayed two liquid phases at a high concentration and molecular weight of PVA. This result was consistent with the prediction of the Flory-Huggins lattice model. On the contrary, the HPPR-PVA-DMSO system exhibited only a single phase. The HPPR-PVA blend gels crosslinked in dimethylsulfoxide (DMSO) were highly transparent over a wide concentration range, while the gels prepared in water were opaque at high polymer concentrations. Spherical domains were observed in the opaque gels by laser scanning confocal microscopy, and the sizes of the domains were significantly dependent on the amount of cross-linking reagent utilized. These results indicated that the transparency of the HPPR-PVA blend gels was strongly affected by the competition between the liquid-liquid two-phase separation and the crosslinking HPPR and PVA polymers during the preparation of the blend gels.

Original languageEnglish
Pages (from-to)270-276
Number of pages7
JournalColloids and Surfaces B: Biointerfaces
Volume56
Issue number1-2
DOIs
Publication statusPublished - 2007 Apr 15
Externally publishedYes

Fingerprint

alcohols
Alcohols
Gels
Liquids
gels
liquids
Dimethyl Sulfoxide
Polymers
Cross-Linking Reagents
high polymers
polyrotaxane
Confocal microscopy
crosslinking
Phase separation
Crosslinking
Transparency
Phase diagrams
reagents
molecular weight
liquid phases

Keywords

  • Blend gel
  • Liquid-liquid equilibrium
  • Phase separation
  • Polyrotaxane
  • Slide-ring gel

ASJC Scopus subject areas

  • Biotechnology
  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry
  • Surfaces and Interfaces

Cite this

Liquid-liquid equilibria of polyrotaxane and poly(vinyl alcohol). / Kataoka, Toshiyuki; Nagao, Yohei; Kidowaki, Masatoshi; Araki, Jun; Ito, Kohzo.

In: Colloids and Surfaces B: Biointerfaces, Vol. 56, No. 1-2, 15.04.2007, p. 270-276.

Research output: Contribution to journalArticle

Kataoka, Toshiyuki ; Nagao, Yohei ; Kidowaki, Masatoshi ; Araki, Jun ; Ito, Kohzo. / Liquid-liquid equilibria of polyrotaxane and poly(vinyl alcohol). In: Colloids and Surfaces B: Biointerfaces. 2007 ; Vol. 56, No. 1-2. pp. 270-276.
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