Defect-Free Nanoporous Thin Films from ABC Triblock Copolymers
| Autor: | Matthew Jeremiah Misner, Craig J. Hawker, Eric Drockenmuller, Seung Hyun Kim, Joona Bang, Thomas P. Russell |
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| Rok vydání: | 2006 |
| Předmět: |
Magnetic Resonance Spectroscopy
Polymers Surface Properties Annealing (metallurgy) Radical polymerization Biocompatible Materials Biochemistry Catalysis Polyethylene Glycols Colloid and Surface Chemistry Microscopy Electron Transmission Materials Testing Polymer chemistry Copolymer Nanotechnology Polymethyl Methacrylate Thin film Porosity Lithography Nanoporous Chemistry General Chemistry Models Chemical Chemical engineering Transmission electron microscopy Microscopy Electron Scanning Polystyrenes |
| Zdroj: | Journal of the American Chemical Society. 128:7622-7629 |
| ISSN: | 1520-5126 0002-7863 |
| DOI: | 10.1021/ja0608141 |
| Popis: | The self-assembly of triblock copolymers of poly(ethylene oxide-b-methyl methacrylate-b-styrene) (PEO-b-PMMA-b-PS), where PS is the major component and PMMA and PEO are minor components, provides a robust route to highly ordered, nanoporous arrays with cylindrical pores of 10-15 nm that show promise in block copolymer lithography. These ABC triblock copolymers were synthesized by controlled living radical polymerization, and after solvent annealing, thin films showing defect-free cylindrical microdomains were obtained. The key to the successful generation of highly regular, porous thin films is the use of PMMA as a photodegradable mid-block which leads to nanoporous structures with an unprecedented degree of lateral order. The power of using a triblock copolymer when compared to a traditional diblock copolymer is evidenced by the ability to exploit and combine the advantages of two separate diblock copolymer systems, the high degree of lateral ordering inherent in PS-b-PEO diblocks plus the facile degradability of PS-b-PMMA diblock copolymer systems, while negating the corresponding disadvantages, poor degradability in PS-b-PEO systems and no long-range order for PS-b-PMMA diblocks. |
| Databáze: | OpenAIRE |
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