Phase behavior of aqueous solutions of copolymers of N, N?-diisopropylfumaramide and N -isopropylacrylamide: Effect of the density of side chains

Akihito Hashidzume, Akiko Matsumoto, Takeshi Mori, Toshiyuki Shikata, Takahiro Sato

Research output: Contribution to journalArticle

5 Citations (Scopus)


This letter describes the phase behavior of aqueous solutions of an N-isopropylacrylamide (NIPAM) homopolymer and copolymers of N,N?- diisopropylfumaramide (DIPFAM) and NIPAM as studied by transmittance measurements, infrared spectroscopy, and differential scanning calorimetry to reveal the effect of the density of N-isopropylamide side chain upon the phase behavior. The clouding-point and clearing-point temperatures decreased with increasing the mole fraction of DIPFAM (x D). It was noteworthy that only an extra side chain per ca. 7 NIPAM units had a remarkable effect on the phase behavior; the interactions between side chains were stronger, the intrapolymer contraction was less favorable, and the cooperativity of phase transition was lower at x D = 0.15 presumably because of the steric hindrance of dense side chains.

Original languageEnglish
Pages (from-to)5522-5526
Number of pages5
Issue number13
Publication statusPublished - Apr 3 2012


All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this