Phase separation in binary polymer solution: Gelatin/Poly(ethylene glycol) system

Miho Yanagisawa, Yutaro Yamashita, Sada Atsu Mukai, Annaka Masahiko, Masayuki Tokita

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We systematically investigated the phase behavior of gelatin and poly(ethylene glycol) (PEG) aqueous solution. With a decrease in temperature, the gelatin/PEG solution became opaque and underwent phase separation. The phase separation point (Tp) was increased with an increase in concentration of gelatin concentration (Cg). However, when Cg was lower than a critical value (C g), Tp was slightly increased with decreasing Cg. In addition, the phase separation mechanism was changed from spinodal decomposition type to nucleation growth type at around C g. The increases in PEG concentration (Cpeg) and in the molecular weight of PEG (Mpeg) raised the Tp curve. A further decrease in temperature resulted in a sol-gel transition for gelatin. In the case of a gelatin solution without PEG, the melting temperature of the gelatin gel (Tm) increased with an increase in Cg and approached a saturation point. The addition of PEG raised the Tm curve closer to the saturation point, implying that Tm for the sample with a larger Cpeg reached the saturation point at a lower Cg. Furthermore, melting enthalpy for the gelatin gel was increased with increases in Cpeg and Mpeg. These results indicate that the addition of PEG increases the strength of hydrogen bonding between gelatin chains. The appearance of minimum in the Tp curve might be originated from the interplay between self-aggregation via intra-chain concentration at a lower Cg and phase separation via inter-chain association at a higher Cg.

Original languageEnglish
Pages (from-to)2-6
Number of pages5
JournalJournal of Molecular Liquids
Volume200
Issue numberPA
DOIs
Publication statusPublished - Jan 1 2014

Fingerprint

gelatins
Gelatin
Polymer solutions
Phase separation
Polyethylene glycols
glycols
ethylene
polymers
gels
saturation
molecular weight
curves
melting
Gels
Molecular weight
Spinodal decomposition
Phase behavior
temperature
Sol-gels
Melting point

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

Phase separation in binary polymer solution : Gelatin/Poly(ethylene glycol) system. / Yanagisawa, Miho; Yamashita, Yutaro; Mukai, Sada Atsu; Masahiko, Annaka; Tokita, Masayuki.

In: Journal of Molecular Liquids, Vol. 200, No. PA, 01.01.2014, p. 2-6.

Research output: Contribution to journalArticle

Yanagisawa, Miho ; Yamashita, Yutaro ; Mukai, Sada Atsu ; Masahiko, Annaka ; Tokita, Masayuki. / Phase separation in binary polymer solution : Gelatin/Poly(ethylene glycol) system. In: Journal of Molecular Liquids. 2014 ; Vol. 200, No. PA. pp. 2-6.
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