Influence of high-pressure on cononsolvency of poly(N-isopropylacrylamide) nanogels in water/methanol mixtures

被引：23
|
作者：
Hofmann, Christian H. [1 ]
Grobelny, Sebastian [2 ]
Erlkamp, Mirko [2 ]
Winter, Roland [2 ]
Richtering, Walter [1 ]
机构：
[1] Rhein Westfal TH Aachen, Inst Phys Chem, D-52056 Aachen, Germany
[2] TU Dortmund Univ, Dept Chem & Chem Biol, D-44227 Dortmund, Germany
来源：
POLYMER | 2014年 / 55卷 / 08期
关键词：
Lower critical solution temperature; Microgel; Phase behaviour; VOLUME-PHASE-TRANSITION; N-ISOPROPYLACRYLAMIDE GELS; COIL-GLOBULE TRANSITION; FTIR-SPECTROSCOPY; AQUEOUS-SOLUTIONS; HYDROSTATIC-PRESSURE; MICROGEL PARTICLES; MIXED-SOLVENTS; TO-GLOBULE; WATER;
D O I：
10.1016/j.polymer.2014.03.006
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
We show that the temperature-induced collapse of poly(N-isopropylacrylamide) (PNiPAm) nanogels in water/methanol mixtures can be reversed by excess hydrostatic pressure. Small angle X-ray scattering (SAXS) results reveal that first a swollen surface layer is established and then the particles swell homogeneously. A threshold pressure needed for rewelling fully collapsed nanogels indicates that hydrophobic interactions inside the nanogel have to be compensated to form a swollen surface layer. The size change is related to a change in polymer solvation detected by infrared (IR) spectroscopy. Pressure favours polymer/water hydrogen bonds to the cost of methanol/polymer bonds so that water is enriched inside the nanogel. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2000 / 2007
页数：8
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