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)

Abstract

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
JournalLangmuir
Volume28
Issue number13
DOIs
Publication statusPublished - Apr 3 2012

Fingerprint

Phase behavior
copolymers
Copolymers
aqueous solutions
Homopolymerization
clearing
Differential scanning calorimetry
Infrared spectroscopy
Phase transitions
contraction
transmittance
heat measurement
infrared spectroscopy
scanning
N-isopropylacrylamide
Temperature
interactions
temperature

All Science Journal Classification (ASJC) codes

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

Cite this

Phase behavior of aqueous solutions of copolymers of N, N?-diisopropylfumaramide and N -isopropylacrylamide : Effect of the density of side chains. / Hashidzume, Akihito; Matsumoto, Akiko; Mori, Takeshi; Shikata, Toshiyuki; Sato, Takahiro.

In: Langmuir, Vol. 28, No. 13, 03.04.2012, p. 5522-5526.

Research output: Contribution to journalArticle

Hashidzume, Akihito ; Matsumoto, Akiko ; Mori, Takeshi ; Shikata, Toshiyuki ; Sato, Takahiro. / Phase behavior of aqueous solutions of copolymers of N, N?-diisopropylfumaramide and N -isopropylacrylamide : Effect of the density of side chains. In: Langmuir. 2012 ; Vol. 28, No. 13. pp. 5522-5526.
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