Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan 30050.
Langmuir. 2013 Aug 13;29(32):9972-8. doi: 10.1021/la401797f. Epub 2013 Jul 31.
We study the formation of porous polymer nanostructures fabricated by the surface-induced phase separation of polymer solutions in anodic aluminum oxide (AAO) templates. Poly(methyl methacrylate) (PMMA) and tetrahydrofuran (THF) are used to investigate the evolution process of the surface-induced phase separation. With the longer immersion time of the AAO template in the polymer solution, the size of the solvent-rich droplet is increased by the coarsening process, resulting in the formation of porous polymer nanostructures. The coarsening mechanism is further evaluated by changing the experimental parameters including the immersion time, the polymer concentration, the polymer molecular weight, and the solvent quality. Under conditions in which polymer solutions have higher viscosities, the coarsening process is slowed down and the formation of the porous nanostructures is prohibited. The prevention of the porous nanostructures can also be realized by adding water to the PMMA/THF solution before the immersion process.
我们研究了通过在阳极氧化铝 (AAO) 模板中聚合物溶液的表面诱导相分离来制备多孔聚合物纳米结构的形成。我们使用聚甲基丙烯酸甲酯 (PMMA) 和四氢呋喃 (THF) 来研究表面诱导相分离的演化过程。随着 AAO 模板在聚合物溶液中浸泡时间的延长，溶剂富液滴的尺寸通过粗化过程增大，从而形成多孔聚合物纳米结构。通过改变实验参数，包括浸泡时间、聚合物浓度、聚合物分子量和溶剂质量，进一步评估了粗化机制。在聚合物溶液具有较高粘度的条件下，粗化过程会减缓，多孔纳米结构的形成会受到抑制。在浸泡过程之前向 PMMA/THF 溶液中加水也可以实现防止多孔纳米结构的形成。
