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Citation: Zhi Geng, Song Guan, He-ming Jiang, Long-cheng Gao, Zhi-wen Liu, Lei Jiang. pH-Sensitive Wettability Induced by Topological and Chemical Transition on the Self Assembled Surface of Block Copolymer[J]. Chinese Journal of Polymer Science, ;2014, 32(1): 92-97. doi: 10.1007/s10118-014-1376-2 shu

pH-Sensitive Wettability Induced by Topological and Chemical Transition on the Self Assembled Surface of Block Copolymer

1.
Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and Environment, BeiHang University, Beijing 100191, China
2.
Agilent Technologies, Beijing 100102, China
3.
1. Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and Environment, BeiHang University, Beijing 100191, China
4.
2. Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
5.

Received Date: 12 March 2013
Revised Date: 19 April 2013

Fund Project: This work was financially supported by the National Natural Science Foundation of China (No. 21204002), Specialized Research Fund for the Doctoral Program of Higher Education (No. 20111102120050), Program for New Century Excellent Talents in Universities (2010) and the Fundamental Research Funds for the Central Universities.

pH-sensitive wettability of polystyrene-b-poly(4-vinylpyridine) (PS-b-P4VP) self assembled films, exhibiting superoleophobicity under water and hydrophilicity at low pH value, and oleophobicity under water and hydrophobicity at neutral condition, has been realized. The wettability properties resulted from the surface topological and chemical transition, which were confirmed by in situ AFM measurements under water at different pH. At low pH, P4VP chains, which were confined in the hexagonal-packed nanodomains, got protonated into a swollen state, while at high pH, P4VP chains were deprotonated into a collapsed state. The reversible protonation/deprotonation procedure on the molecular scale leads to surface topological and chemical transition, thereby pH-sensitive wettability.
- Block copolymer,
- Wettability,
- pH sensitive,
- Self assembly
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