Influence of pressure on the state of poly(N-isopropylacrylamide) and poly(N,N-diethylacrylamide) derived polymers in aqueous solution as probed by FTIR-spectroscopy

被引：31

作者：

Puehse, Matthias ^{[1
]}

Keerl, Martina ^{[2
]}

Scherzinger, Christine ^{[2
]}

Richtering, Walter ^{[2
]}

Winter, Roland ^{[1
]}

机构：

[1] TU Dortmund Univ, Fac Chem, D-44227 Dortmund, Germany

[2] Rhein Westfal TH Aachen, Inst Phys Chem, D-52056 Aachen, Germany

来源：

POLYMER | 2010年 / 51卷 / 16期

关键词：

High pressure; FTIR spectroscopy; Microgels; VOLUME-PHASE-TRANSITION; STRUCTURAL-CHANGES; TEMPERATURE; BEHAVIOR; DENATURATION; SOLVATION; PROTEINS; DIAGRAM; ACID);

D O I：

10.1016/j.polymer.2010.06.011

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 investigated the hydration and swelling properties of poly(N-isopropylacrylamide) and poly(N-isopropylacrylamide)-poly(N,N-diethylacrylamide) derived microgels by Fourier transform infrared- (FTIR-) spectroscopy in a wide region of the temperature pressure plane. These systems are known to show a swollen-to-collapsed-transition upon temperature elevation. Our data reveal that pressure favours the swollen, hydrated state over the collapsed state in all systems investigated. A detailed analysis of the fractions of the respective IR sensitive amide-I'-subbands allowed the calculation of Delta G(0) and Delta V-0 for the pressure-induced swelling process as well as evaluation of various intra- and intermolecular hydrogen bonding connectivities in the different systems. In fact, considerable differences exist between different polymer or microgel types with regards to their hydrogen bonding pattern as a function of temperature and pressure, and the microgels may even exhibit a biphasic swelling behavior. Notably, the thermodynamic parameters derived reveal to be in the same order of magnitude as measured for the pressure and cold denaturation of proteins. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：3653 / 3659

页数：7

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