Overshooting Effect of Poly(Dimethylaminoethyl Methacrylate) Hydrogels

被引：30

作者：

Li, Cancan ^{[1
]}

Xu, Ling ^{[1
,2
]}

Zhai, Maolin ^{[1
]}

Peng, Jing ^{[1
]}

Li, Jiuqiang ^{[1
]}

机构：

[1] Peking Univ, Beijing Natl Lab Mol Sci, Dept Appl Chem, Coll Chem & Mol Engn, Beijing 100871, Peoples R China

[2] Peking Univ, Dept Energy & Resources Engn, Coll Engn, Beijing 100871, Peoples R China

来源：

JOURNAL OF APPLIED POLYMER SCIENCE | 2011年 / 120卷 / 04期

关键词：

hydrogels; kinetics (polym.); swelling; ANOMALOUS PENETRANT TRANSPORT; RADIATION SYNTHESIS; SWELLING KINETICS; ETHYLMETHACRYLATE) HYDROGELS; GLASSY-POLYMERS; ACRYLIC-ACID; POLYSTYRENE; ADSORPTION; WATER; IONS;

D O I：

10.1002/app.33328

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

An overshooting effect was observed during the swelling procedure of poly(dimethylaminoethyl methacrylate) (PDMAEMA) gel for the first time. The effects of the temperature, ionic strength, and pH on the overshooting effect of the PDMAEMA gel were investigated. We found that the overshooting effect of the gel could not be eliminated by changing the temperature; however, the overshooting effect was indiscernible in high-concentration NaCl solutions (> 0.2 mol/L) and basic (pH 11.9) and acidic solutions (pH = 2.1). The overshooting effect of the PDMAEMA gel was attributed to the dynamic conformational changes of the side chains of dimethylaminoethyl methacrylate (DMAEMA) units during the swelling of the gels. In the presence of NaCl or NaOH, the stretching of the macromolecular chains of the gels was disrupted. While in acidic solution, the protonation of tertiary amino groups in the DMAEMA units made the side chains of the DMAEMA units change from the cyclic conformation to the stretched one; this was analyzed with the aid of Fourier transform infrared spectroscopy. (c) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 120: 2027-2033, 2011

引用

页码：2027 / 2033

页数：7

共 35 条

[1] Switching the properties of polyelectrolyte brushes via "Hydrophobic collapse" [J].