Synthesis and characterization of porous glycidylmethacrylate-divinylbenzene monoliths using the high internal phase emulsion approach
Synthesis and characterization of porous glycidylmethacrylate-divinylbenzene monoliths using the high internal phase emulsion approach
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DOI：
10.1016/j.reactfunctpolym.2009.05.007
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发表时间：
2009-09-01
影响因子：
5.1
通讯作者：
Bernabei, Manuele
中科院分区：
文献类型：
--
作者：
Barbetta, Andrea;Dentini, Mariella;Bernabei, Manuele
使用甲基丙烯酸缩水甘油酯 (GMA) 和二乙烯基苯在致孔剂存在下合成高度多孔的整体材料，并采用乳液模板作为制备技术 (polyHIPE)。使用两种表面活性剂作为乳液稳定剂。事实证明，表面活性剂的选择对于成功合成含有大量功能单体GMA且具有明确形态特征的polyHIPE至关重要。脱水山梨糖醇单油酸酯 (SPAN 80) 在稳定 GMA 含量 > 40% v/v 的乳液方面表现出较差的性能。相反，脂肪酸聚甘油 (PGE 080/D) 表现出优异的性能，可以稳定 GMA 含量高达 80% v/v 的乳液。由此产生的聚HIPE呈现出明确的形态和表面积，与相同组成的相应树脂非常接近。这证明PGE可以有效抑制奥斯特瓦尔德熟化等乳液失稳现象。研究工作的一个重要部分是致力于研究环氧基团在合成和纯化过程中是否保持其完整性。事实证明，发生水解的暴露环氧基团的百分比取决于孔的大小。低于阈值尺寸的孔不被水润湿，并且它们内部存在的环氧基团保持不变。相反，以直径高于该阈值为特征的孔内的环氧基团发生水解。 (C) 2009 Elsevier Ltd. 保留所有权利。
Highly porous monoliths were synthesised using glycidyl methacrylate (GMA) and divinylbenzene in the presence of a porogen, and emulsion templating as the preparation technique (polyHIPEs). Two surfactants were used as the emulsion stabiliser. It turned out that the choice of the surfactant was essential for the successful synthesis of polyHIPEs containing large amount of the functional monomer GMA, and characterised by a well-defined morphology. Sorbitan monooleate (SPAN 80) showed poor performances in stabilising emulsions with a content of GMA > 40% v/v. On the contrary, polyglycerol of a fatty acid (PGE 080/D) exhibited superior performances allowing to stabilise emulsion with a GMA content up to 80% v/v. The ensuing polyHIPEs presented a well-defined morphology and surface areas very close to those of the corresponding resins of the same composition. This proved that emulsion destabilising phenomenon such as Ostwald ripening was effectively inhibited by PGE.An important part of the research work was dedicated to investigate whether the epoxy group retained its integrity during synthesis and purification. It turned out that the percentage of the exposed epoxy groups that underwent hydrolysis depended on the size of the pores. Pores below a threshold size were not wetted by water and the epoxy groups present inside them were left unchanged. On the contrary, the epoxy groups within pores characterised by a diameter above this threshold underwent hydrolysis. (C) 2009 Elsevier Ltd. All rights reserved.