NEW DEVELOPMENTS IN THE FABRICATION OF ORDERED STRUCTURES BY BREATH FIGURES
(0) Highly ordered micro-porous materials have attracted intensive interest due to their potential applications in biology, tissue engineering, micrographics, optics, separation and so on. Strategies including templating, self-assembly and breath figures method (BFs) have been developed for fabrication of micro-porous materials. Among these methods, BFs is a simple and effective technique which can dynamically control over both the pore formation and the morphology of the resultant pores. In a typical BFs method, a dilute polymer solution is cast on substrate in a humid atmosphere. Because the evaporative cooling of the volatile solvent, water microspheres will condense on the cold solution surface from the moisture and arrange hexagonally to reduce the free energy. Polymer assembles around the hexagonal templates at the interface between water and solution, forming the regular pore patterns after the evaporation of water and solvent. Herein, we employed the water arrays in BFs not only as the templates but the initiator or micro-reactor as well. The first example is to cast a monomer solution of alkylcyanoacrylate (ACA) in CHCl3 on substrate under high humidity. ACA can be initiated by water to perform an anionic polymerization at room temperature quickly. Therefore, the polymerization of ACA and the self-assembly of the synthesized polymer took place simultaneously in the BFs process, leading to the formation of honeycomb patterned polyalkylcyanoacrylates films (Fig.la). This is the first report of fabrication of ordered film from monomer solution. The second example is casting a mixture solution of TiCl_4/PS/CHCl_3. The water arrays perform the template for the formation of porous PS matrix and also the micro-reactors for the hydrolysis of TiCl_4 (Fig. lb). As a result, a composite film with inorganic particles located separately in the holes of the honeycomb-like PS film was formed.
Xiaofeng Li Ning Zhao Jian Xu
State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P.R.China
国际会议
PP’2010，Jinan International Symposium on Polymer Physics(2010济南国际高分子物理学术研讨会)
济南
英文
89
2010-06-06（万方平台首次上网日期，不代表论文的发表时间）