TY - JOUR
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
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
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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U2 - 10.1021/la300934g
DO - 10.1021/la300934g
M3 - Article
C2 - 22424075
AN - SCOPUS:84859463454
VL - 28
SP - 5522
EP - 5526
JO - Langmuir
JF - Langmuir
SN - 0743-7463
IS - 13
ER -