Breath figure templated self-assembly of porous diblock copolymer films

作     者：Aaron E. Saunders Jasper L. Dickson Parag S. Shah Min Young Lee Kwon Taek Lim Keith P. Johnston Brian A. Korgel 

作者机构：Department of Chemical Engineering Texas Materials Institute Center for Nano- and Molecular Science and Technology University of Texas Austin Texas 78712 USA Division of Image and Information Engineering Pukyong National University Pusan 608-739 Korea 

出 版 物：《Physical Review E》 (物理学评论E辑：统计、非线性和软体物理学)

年 卷 期：2006年第73卷第3期

页      面：031608-031608页

核心收录：

学科分类：07[理学] 070203[理学-原子与分子物理] 0702[理学-物理学] 

主　　题：Plastic films 

摘      要：Porous polyethylene oxide–b–polyfluorooctylmethacrylate (PEO−b−PFOMA) diblock copolymer films were drop cast onto substrates from Freon (1,1,2-trichlorotrifluoroethane) in a humid atmosphere. The pores in the films exhibit long range hexagonal order in some cases, depending on the PFOMA-to-PEO molecular weight ratio. Films with the best ordered pores were formed with PFOMA-to-PEO ratios of 70kDa:2kDa. The pores in the polymer films derive from water droplets that condense as Freon evaporates. The polymer stabilizes the water droplets, or “breath figures, which act as an immiscible template that molds the porous film. Increased polymer hydrophobicity reduces the water wettability of the air/Freon interface, which in turn decreases water droplet nucleation, thus influencing the final pore size and spatial order in the polymer films. We describe how water droplet nucleation influences the final pore size and packing order in the polymer films.