Lower Critical Solution Temperature Behavior of Poly (N-(2-ethoxyethyl)acrylamide) as Compared with Poly(N-isopropylacrylamide)

被引:28
|
作者
Maeda, Yasushi [1 ]
Sakamoto, Junichi [1 ]
Wang, Shuang-yin [1 ]
Mizuno, Yuuichi [1 ]
机构
[1] Univ Fukui, Dept Appl Chem & Biotechnol, Fukui 9108507, Japan
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 2009年 / 113卷 / 37期
基金
日本学术振兴会;
关键词
REENTRANT PHASE-TRANSITION; N-ISOPROPYLACRYLAMIDE GELS; AQUEOUS-SOLUTIONS; FTIR SPECTROSCOPY; POLY(VINYL METHYL-ETHER); HYDRATION STATES; SWOLLEN NETWORKS; WATER; SOLVENT; POLY(N-ISOPROPYLMETHACRYLAMIDE);
D O I
10.1021/jp9052067
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Temperature-responsive phase separation of poly(N-(2-ethoxyethyl)acrylamide) (PEoEA, phase transition temperature, T(p) = 38 degrees C) and poly(N-(2-ethoxyethyl)methacrylamide) (PEoEMA, T(p) = 50 degrees C) in aqueous solutions has been investigated by infrared spectroscopy. They had a wide transition temperature region (similar to 25 degrees C), and their T(p) monotonically increased with increasing concentration of added methanol, unlike re-entrant phase separation of poly(N-isopropylacrylamide) (PNiPAM). Their amide I bands consisted of two components assignable to singly and doubly hydrogen bonding C=O groups in both aqueous solutions and methanol/water mixtures. The intensity of the latter decreased during both phase separation and an increase in methanol concentration, whereas the v(C-H) bands underwent red shifts. The changes were qualitatively the same as those of PNiPAM, although PNiPAM has a higher tendency to accept double hydrogen bonds at the C=O groups. The behavior of the copolymers of N-(2-ethoxyethyl)acrylamide and N-isopropylacrylamide in methanol/water mixtures gradually approached that of PNiPAM with an increasing content of the latter, suggesting that the interaction between each individual monomer unit and solvent molecules cooperatively determines their behavior as a whole.
引用
收藏
页码:12456 / 12461
页数:6
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