Photografting and the control of surface chemistry in three-dimensional porous polymer monoliths
Photografting and the control of surface chemistry in three-dimensional porous polymer monoliths
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DOI：
10.1021/ma021351w
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发表时间：
2003-03-11
期刊：
影响因子：
5.5
通讯作者：
Fréchet, JMJ
中科院分区：
文献类型：
--
作者：
Rohr, T;Hilder, EF;Fréchet, JMJ
多孔三维材料的光接枝已经实现了使用二苯甲酮引发的表面光聚合反应内的大孔聚合物整料中包含在熔融石英毛细管的孔。尽管所涉及的材料层的厚度相对较高（100 μ m或更大），但如电子探针显微分析所证实的，光接枝过程在其整个横截面中有效地发生。此外，在接枝期间使用光掩模使得能够在单个整料的选定和预定区域中精确放置特定功能，以用于从负载型催化到微流体的各种应用。例如，我们已经证明了快速和选择性地将聚（2-丙烯酰胺基-2-甲基-1-丙磺酸）链掺入到100 μ m厚的整料的孔的照射区域中，并通过测量新引入的离子化官能团所提供的电渗流来监测接枝的程度。多孔聚合物与4，4-二甲基-2-乙烯基偶氮内酯的接枝也是成功的，并且可以通过用若丹明6 G荧光标记接枝链后的荧光测量来视觉监测。
The photografting of porous three-dimensional materials has been achieved using a benzophenone-initiated surface photopolymerization within the pores of a macroporous polymer monolith contained in a fused silica capillary. Despite the relatively high thickness (100 mum or more) of the layer of material involved, the photografting process occurs efficiently throughout its cross section as confirmed by electron probe microanalysis. In addition, the use of photomasks during grafting enables the precise placement of specific functionalities in selected and predetermined areas of a single monolith for use in a variety of applications ranging from supported catalysis to microfluidics. For example, we have demonstrated the fast and selective incorporation of chains of poly(2-acrylamido-2-methyl-1-propanesulfonic acid) into the irradiated areas of pores of a 100 mum thick monolith and monitored the extent of grafting through measurements of the electroosmotic flow afforded by the newly introduced ionized functionalities. Grafting of the porous polymer with 4,4-dimethyl-2-vinylazlactone was also successful and could be monitored visually by fluorescence measurements following fluorescent labeling of the grafted chains with Rhodamine 6G.