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

doi:10.1021/la300934g

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 journal › Article › peer-review

6 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 language	English
Pages (from-to)	5522-5526
Number of pages	5
Journal	Langmuir
Volume	28
Issue number	13
DOIs	https://doi.org/10.1021/la300934g
Publication status	Published - Apr 3 2012

All Science Journal Classification (ASJC) codes

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

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10.1021/la300934g

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

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.",

author = "Akihito Hashidzume and Akiko Matsumoto and Takeshi Mori and Toshiyuki Shikata and Takahiro Sato",

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T1 - Phase behavior of aqueous solutions of copolymers of N, N?-diisopropylfumaramide and N -isopropylacrylamide

T2 - Effect of the density of side chains

AU - Hashidzume, Akihito

AU - Matsumoto, Akiko

AU - Mori, Takeshi

AU - Shikata, Toshiyuki

AU - Sato, Takahiro

PY - 2012/4/3

Y1 - 2012/4/3

N2 - 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.

AB - 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.

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

Abstract

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