霍夫迈斯特盐对不同亲水性聚（2-恶唑啉）低临界溶液温度转变的影响

The Effect of Hofmeister Salts on the LCST Transition of Poly(2-oxazoline)s with Varying Hydrophilicity.

作者信息

Bloksma Meta M, Bakker Daniël J, Weber Christine, Hoogenboom Richard, Schubert Ulrich S

机构信息

Laboratory of Macromolecular Chemistry and Nanoscience, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands; Dutch Polymer Institute (DPI), P.O. Box 902, 5600 AX Eindhoven, The Netherlands; Laboratory of Organic and Macromolecular Chemistry, Friedrich-Schiller-Universität Jena, Humboldtstrasse 10, 07743 Jena, Germany; www.iomc.uni-jena.de.

出版信息

Macromol Rapid Commun. 2010 Apr 20;31(8):724-8. doi: 10.1002/marc.200900843. Epub 2010 Mar 9.

DOI:10.1002/marc.200900843

PMID:21590962

Abstract

The influence of Hofmeister salts was investigated on the cloud point of three poly(2-oxazoline)s, namely poly(2-ethyl-2-oxazoline) [PEtOx], poly(2-n-propyl-2-oxazoline) [PnPropOx], and poly(2-isopropyl-2-oxazoline) [PiPropOx]. In addition, a comb polymer based on oligo-2-ethyl-2-oxazoline side chains and a methacrylate backbone (POEtOxMA) was included in this investigation. It was found that the ionic response of the poly(2-oxazoline)s strongly depends on their hydrophilicity. The comb polymer POEtOxMA revealed a strikingly similar response to the salts as linear PEtOx even though the cloud points of the polymers in water differ. This indicates that the architecture does not significantly influence the effect of the Hofmeister ions, even though there is a difference in the absolute cloud point.

摘要

研究了霍夫迈斯特盐对三种聚（2-恶唑啉）的浊点的影响，这三种聚（2-恶唑啉）分别是聚（2-乙基-2-恶唑啉）[PEtOx]、聚（2-正丙基-2-恶唑啉）[PnPropOx]和聚（2-异丙基-2-恶唑啉）[PiPropOx]。此外，一种基于低聚-2-乙基-2-恶唑啉侧链和甲基丙烯酸酯主链的梳状聚合物（POEtOxMA）也被纳入了该研究。结果发现，聚（2-恶唑啉）的离子响应强烈依赖于它们的亲水性。尽管聚合物在水中的浊点不同，但梳状聚合物POEtOxMA对盐的响应与线性PEtOx惊人地相似。这表明，即使绝对浊点存在差异，聚合物结构对霍夫迈斯特离子的影响也不显著。