2015年11月1日
Enhanced Wettability Changes by Synergistic Effect of Micro/Nanoimprinted Substrates and Grafted Thermoresponsive Polymer Brushes
Macromolecular Rapid Communications
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- 巻
- 36
- 号
- 22
- 開始ページ
- 1965
- 終了ページ
- 1970
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1002/marc.201500393
- 出版者・発行元
- Wiley-VCH Verlag
Thermoresponsive polymer brushes are grafted on micro/nanostructured polymer substrates as new intelligent interfaces that synergistically enhance wettability changes in response to external temperature stimuli. Thermoplastic poly(styrene-co-4-vinylbenzyl chloride) [P(St-co-VBC)] is synthesized using radical polymerization and spin-coated on a glass substrate. Micro/nanopillar and hole patterns are imprinted on the P(St-co-VBC) layer using thermal nanoimprint lithography. Poly(N-isopropylacrylamide) (PIPAAm) brushes are grafted on the micro/nanostructured P(St-co-VBC) layer through surface-initiated atom-transfer radical polymerization using 4-vinylbenzyl chloride as the initiator. The imprinted micro/nanostructures and grafted PIPAAm brush chain lengths affect the surface wettability. Combinations of nanopillars or nanoholes (diameter 500 nm) and longer PIPAAm brushes enhance hydrophobic/hydrophilic changes in response to temperature changes, compared with the flat substrate. The thermoresponsive hydrophobic/hydrophilic transition is synergistically enhanced by the nanostructured surface changing from Cassie-Baxter to Wenzel states. This PIPAAm-brush-modified micro/nanostructured P(St-co-VBC) is a new intelligent interface that effectively changes wettability in response to external temperature changes. Novel thermoresponsive interfaces showing significant wettability changes are fabricated by nanoimprinting a poly(styrene-co-4-vinylbenzyl chloride) layer and subsequent surface-initiated atom transfer radical polymerization of poly(N-isopropylacrylamide) (IPAAm). Combinations of nanopillars or nanoholes and longer PIPAAm brushes enhance hydrophobic/hydrophilic changes in response to temperature changes, compared with a flat substrate.
- ID情報
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- DOI : 10.1002/marc.201500393
- ISSN : 1521-3927
- ISSN : 1022-1336
- PubMed ID : 26375171
- SCOPUS ID : 84954026718