Vaysse Malvina, Khan Mostofa Kamal, Sundararajan Pudupadi
Department of Chemistry, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario K1S 5B6, Canada.
Langmuir. 2009 Jun 16;25(12):7042-9. doi: 10.1021/la900722k.
We fabricated porous organogels of poly(methyl methacrylate) (PMMA) using nonsolvents as porogens. In contrast to the use of inorganic materials, surfactants, etc., as porogens, we used the nonsolvents for PMMA such as water, methanol, propanol, and cyclohexane. This offers the advantage of not having to extract the porogen after gel formation. The nonsolvent simply evaporates. We find that the pore size can be controlled by matching the solubility parameters of the solvent/nonsolvent mixtures and that of PMMA. Incorporation of CNT itself does not lead to porous morphology in this case, unless a nonsolvent is added. Introducing carbon nanotubes during the addition of nonsolvent for gelation enhances the elongation ratio of the PMMA gel. We show that the CNT forms a network around the pores. Infrared and Raman spectra show no specific interaction between the CNT and PMMA. Hence, the former simply acts as a reinforcing filler.
我们使用非溶剂作为致孔剂制备了聚甲基丙烯酸甲酯（PMMA）多孔有机凝胶。与使用无机材料、表面活性剂等作为致孔剂不同，我们使用了PMMA的非溶剂，如水、甲醇、丙醇和环己烷。这具有凝胶形成后无需提取致孔剂的优点。非溶剂会简单地蒸发掉。我们发现，通过匹配溶剂/非溶剂混合物与PMMA的溶解度参数，可以控制孔径。在这种情况下，除非添加非溶剂，否则碳纳米管（CNT）本身不会导致形成多孔形态。在添加用于凝胶化的非溶剂过程中引入碳纳米管可提高PMMA凝胶的伸长率。我们表明，碳纳米管在孔周围形成网络。红外光谱和拉曼光谱显示碳纳米管与PMMA之间没有特定相互作用。因此，前者仅作为增强填料起作用。
