Enhanced Wettability Changes by Synergistic Effect of Micro/Nanoimprinted Substrates and Grafted Thermoresponsive Polymer Brushes

Kenichi Nagase, Takahiro Onuma, Masayuki Yamato, Naoya Takeda, Teruo Okano

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1965-1970
Number of pages6
JournalMacromolecular Rapid Communications
Volume36
Issue number22
DOIs
Publication statusPublished - 2015 Nov 1
Externally publishedYes

Keywords

  • contact angles
  • intelligent interfaces
  • nanoimprint lithography
  • polymer brushes
  • thermoresponsive

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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