Highly ordered nanoporous thin films by blending of PSt‐b‐PMMA block copolymers and PEO additives as structure directing agents |
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| Authors: | Sung Chan Park Hyunjung Jung Ken‐ichi Fukukawa Luis M. Campos Kyunghee Lee Kyusoon Shin Craig J. Hawker Jeong Sook Ha Joona Bang |
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| Affiliation: | 1. Department of Chemical and Biological Engineering, Korea University, Seoul 136‐701, Republic of Korea;2. Materials Research Laboratory, University of California, Santa Barbara, California 93106;3. School of Chemical and Biological Engineering, Seoul National University, Seoul 151‐744, Republic of Korea |
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| Abstract: | Herein, we present a simple method for producing nanoporous templates with a high degree of lateral ordering by self‐assembly of block copolymers. A key feature of this approach is control of the orientation of polymeric microdomains through the use of hydrophilic additives as structure directing agents. Incorporation of hydrophilic poly(ethylene oxide) (PEO) moieties into poly(styrene‐b‐methyl methacrylate) (PSt‐b‐PMMA) diblock copolymers gives vertical alignment of PMMA cylinders on the substrate after solvent annealing. Because of the miscibility between PEO and PMMA, PEO additives were selectively positioned within PMMA microdomains and by controlling the processing conditions, it was found that ordering of PSt‐b‐PMMA diblock copolymers could be achieved. The perpendicular orientation of PMMA cylinders was achieved by increasing the molecular size of the PEO additives leading to an increased hydrophilicity of the PMMA domains and consequently to control the orientation of microdomains in PSt‐b‐PMMA block copolymer thin films. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 8041–8048, 2008 |
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| Keywords: | additives block copolymers star polymers thin films |
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