Probing carbonyl-water hydrogen-bond interactions in thin polyoxazoline brushes.
Probing carbonyl-water hydrogen-bond interactions in thin polyoxazoline brushes.
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DOI：
10.1116/1.4939249
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发表时间：
2016-01
期刊：
影响因子：
2.1
通讯作者：
Annika Kroning;A. Furchner;Stefan Adam;Petra Uhlmann;Karsten Hinrichs
中科院分区：
文献类型：
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作者：
Annika Kroning;A. Furchner;Stefan Adam;Petra Uhlmann;Karsten Hinrichs
基于恶唑啉的温度敏感型聚合物刷子作为生物相容性表面越来越受到人们的关注。在水环境中，它们可以在温度刺激引发的亲水和疏水行为之间进行调节。这种转变与分子-溶剂相互作用的变化有关，并导致刷子在膨胀状态和塌陷状态之间的转换。本工作研究了聚(2-恶唑啉)刷子与水之间的温度相关相互作用。用原位红外椭偏仪对热响应性聚(2-环丙基-2-恶唑啉)、非响应性亲水性聚(2-甲基-2-恶唑啉)及其共聚物进行了详细的研究。重点放在刷子的羰基与水分子的相互作用上。可以观察到不同的聚合物-水相互作用，并将其归属为C=O基团与水分子之间的氢键。通过酰胺I带的频移和强度变化确定了电刷在20-45°C范围内的开关行为。
Temperature-responsive oxazoline-based polymer brushes have gained increased attention as biocompatible surfaces. In aqueous environment, they can be tuned between hydrophilic and hydrophobic behavior triggered by a temperature stimulus. This transition is connected with changes in molecule-solvent interactions and results in a switching of the brushes between swollen and collapsed states. This work studies the temperature-dependent interactions between poly(2-oxazoline) brushes and water. In detail, thermoresponsive poly(2-cyclopropyl-2-oxazoline), nonresponsive hydrophilic poly(2-methyl-2-oxazoline), as well as a copolymer of the two were investigated with in situ infrared ellipsometry. Focus was put on interactions of the brushes' carbonyl groups with water molecules. Different polymer-water interactions could be observed and assigned to hydrogen bonding between C=O groups and water molecules. The switching behavior of the brushes in the range of 20-45 °C was identified by frequency shifts and intensity changes of the amide I band.