YAMATO Masayuki
   Department   Research Institutes and Facilities, Research Institutes and Facilities
   Position   Professor
Article types Original article
Language English
Peer review Peer reviewed
Title Enhanced Wettability Changes by Synergistic Effect of Micro/Nanoimprinted Substrates and Grafted Thermoresponsive Polymer Brushes.
Journal Formal name：Macromolecular rapid communications
Abbreviation：Macromol Rapid Commun
ISSN code：15213927/10221336
Domestic / ForeginForegin
Volume, Issue, Page 36(22),pp.1965-1970
Author and coauthor NAGASE Kenichi†*, ONUMA Takahiro, YAMATO Masayuki, TAKEDA Naoya*, OKANO Teruo*
Publication date 2015/11
Summary 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.
DOI 10.1002/marc.201500393
PMID 26375171