Journal
CHEMISTRY OF MATERIALS
Volume 27, Issue 9, Pages 3441-3449Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.5b00842
Keywords
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Funding
- Advanced Biomass R&D Center (ABC) of Global Frontier Project - Ministry of Science, ICT and Future Planning [ABC-2011-0031350]
- Graphene Materials and Components Development Program of MOTIE/KEIT [10044412]
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Exquisite surface wettability control of separation system surface is required to achieve separation of liquids with low surface tension difference. Here, we demonstrate a series of surface-energy-controlled homogeneous copolymer films to control the surface wettability of polyester fabric, utilizing a vapor-phase process, termed as initiated chemical vapor deposition (iCVD). The homogeneous copolymer films consist of a hydrophobic polymer, poly(2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane), pV4D4, and a hydrophilic polymer, poly(4-vinylpyridine), p4VP. Because the mixing of two or more components is always favorable in vapor phase, the iCVD process allows the formation of homogeneous copolymers from two immiscible, hydrophilic/hydrophobic monomer pairs, which is highly challenging to achieve in liquid phase. Simply by tuning the flow rate ratio of monomer pairs, a series of homogeneous copolymers with systematically controlled surface energy were formed successfully. The fabricated separation system could separate water (surface energy = 72.8 mJ/m(2)), glycerol (64 mj/m(2)), ethylene glycol (48 mJ/m(2)), and olive oil (35.1 mJ/m(2)) sequentially with excellent selectivity, just by choosing a copolymer-coated polyester fabric with proper surface energy. Considering the small differences in the surface tension of the liquids used in this work, the surface-energy-controlled separation system can be a powerful tool to separate various kinds of liquid mixtures.
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