Synthesis of functional photopolymerized macroporous PolyHIPEs by atom transfer radical polymerization surface grafting
Synthesis of functional photopolymerized macroporous PolyHIPEs by atom transfer radical polymerization surface grafting
复制标题
DOI：
10.1021/cm071511o
复制
发表时间：
2007-10-30
影响因子：
8.6
通讯作者：
Heise, Andreas
中科院分区：
文献类型：
--
作者：
Cummins, David;Wyman, Paul;Heise, Andreas
开发了一种获得高功能大孔材料的通用平台。将原子转移自由基聚合（ATRP）的可聚合引发剂引入高内相乳液（HIPE）中，而不影响乳液的稳定性。该制剂的光聚合导致在可用于聚合物接枝反应的表面上具有ATRP引发剂基团的聚HIPE。后者首先通过甲基丙烯酸甲酯（MMA）的接枝得到证实。通过IR分析证实聚HIPE中存在PMMA。此外，扫描电子显微镜图像显示接枝反应后的聚HIPE的表面形态的变化。根据ATRP的可控特性，PMMA接枝的聚HIPE与HEMA的再引发得到嵌段共聚物是可能的。此外，通过甲基丙烯酸缩水甘油酯的接枝，得到功能化的聚HIPE。IR和SEM分析证实，这导致聚HIPE表面光滑均匀地覆盖，具有高密度的反应性环氧基。在随后的反应中，这些材料通过环氧环的开环而变得亲水，并且通过随后与五氟苯甲酰氯的反应而变得疏水。
A versatile platform to obtain highly functional macroporous materials was developed. A polymerizable initiator for atom transfer radical polymerization (ATRP) has been incorporated into a high internal phase emulsion (HIPE) without compromising the emulsion stability. Photopolymerization of this formulation led to polyHIPE with ATRP initiator groups on the surface available for polymer grafting reactions. The latter was first demonstrated by grafting of methylinethacrylate (MMA). Analysis by IR confirms the presence of PMMA in the polyHIPE. Moreover, scanning electron microscopy images show changes in the surface morphology of the polyHIPE after the grafting reaction. In accordance with the controlled character of ATRP, reinitiation from the PMMA-grafted polyHIPE with HEMA to afford block copolymers was possible. Moreover, functionalized polyHIPE was obtained by the grafting of glycidyl methacrylate. IR and SEM analysis confirm that this resulted in a smooth and homogeneous coverage of the polyHIPE surface with a high density of reactive epoxy groups. In a subsequent reaction these materials were rendered hydrophilic by ring opening of the epoxy rings and hydrophobic by subsequent reaction with pentafluorobenzoylchloride.