Mechanistic Investigation of the Counterion-Induced UCST Behavior of Poly(N,N-dimethylaminoethyl methacrylate) Polymer Brushes,Macromolecules

当前位置： X-MOL 学术 › Macromolecules › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Mechanistic Investigation of the Counterion-Induced UCST Behavior of Poly(N,N-dimethylaminoethyl methacrylate) Polymer Brushes
Macromolecules ( IF 5.1 ) Pub Date : 2020-03-10 , DOI: 10.1021/acs.macromol.9b02666
Patricia Flemming _{1,

2} , Martin Müller _{1,

2} , Andreas Fery _{1,

2} , Alexander S. Münch ₁ , Petra Uhlmann _{1,

3}

Affiliation

Because of its multiresponsive behavior upon variation of pH value, temperature, and ionic strength, poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA) is an attractive candidate for adaptive surface coatings, especially in the field of biomedical sensors. In the presented article, PDMAEMA Guiselin brushes (5–12 nm, dry thickness) were prepared by the grafting-to approach, and the thermoresponsive UCST-type (upper critical solution temperature) behavior of the generated films, induced by [Fe(CN)₆]^3–, was demonstrated for the first time. To clarify the specific mechanism of the temperature responsiveness, the molecular interactions between polymer chains and complex ions were studied by in situ infrared spectroscopy and in situ ellipsometry, showing wavenumber shifts of the ν(C≡N) band due to ion pairing as well as changes of the ν(OH) band intensity due to swelling. Conclusively, experimental data suggest that the electrostatic interaction between the two components plays a significant role in the thermoresponsive behavior of PDMAEMA films. Using this knowledge, the UCST of the PDMAEMA Guiselin brushes could be adjusted between 34.0 ± 1.2 °C at pH 8 and 40.7 ± 2.0 °C at pH 5.

中文翻译：

抗衡离子诱导聚（N，N-二甲基氨基乙基甲基丙烯酸甲酯）聚合物刷的UCST行为的机理研究

由于其在pH值，温度和离子强度变化时的多响应行为，因此，聚（N，N-甲基丙烯酸N-二甲氨基乙基）（PDMAEMA）是自适应表面涂层的有吸引力的候选物，特别是在生物医学传感器领域。在本文中，通过接枝方法制备了PDMAEMA Guiselin刷（5–12 nm，干厚度），并且[Fe（CN）诱导了生成的薄膜的热响应UCST型（临界温度上限）行为。）₆ ] ^3–，是第一次展示。为了阐明温度响应的具体机理，通过原位红外光谱和原位椭圆偏振法研究了聚合物链与复合离子之间的分子相互作用，结果显示了由于离子对以及原子对引起的ν（C≡N）谱带的波数位移。膨胀引起的ν（OH）谱带强度变化。总之，实验数据表明，两种组分之间的静电相互作用在PDMAEMA膜的热响应行为中起着重要作用。利用这一知识，可以在pH 8的34.0±1.2°C和pH 5的40.7±2.0°C之间调整PDMAEMA Guiselin刷子的UCST。

更新日期：2020-03-12

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11