Ultraviolet bonding of perfluoropolyethers to carbon surfaces investigated using quantum chemical methods

Alam, Md. Khorshed; Zhang, Hedong; Koga, Nobuaki; Iuchi, Satoru

doi:10.1007/s00542-013-1824-x

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…More recently, as shown in Scheme , Nakakawaji proposed that both the excitation of the substrate and the excitation of the PFPE contribute to the bonding between PFPE and the substrate under UV irradiation. Regardless of the exact mechanism that requires further investigation, our results are in line with the previous reports − showing that UV irradiation results in the covalent bonding between Z-03 and the silica substrate.…”

Section: Resultssupporting

confidence: 92%

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Fabricating Nanometer-Thick Simultaneously Oleophobic/Hydrophilic Polymer Coatings via a Photochemical Approach

et al. 2016

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The simultaneously oleophobic/hydrophilic coatings are highly desirable in antifogging, oil-water separation, and detergent-free cleaning. However, such coatings require special chemical structure, i.e., perfluorinated backbone and polar end-groups, and are too expensive for real-life application. Here, we have developed an UV-based photochemical approach to make nanometer-thick perfluoropolyethers without polar end-groups, which are not intrinsically simultaneously oleophobic/hydrophilic but cost-effective, become simultaneously oleophobic/hydrophilic. The contact angle, ellipsometry, and X-ray photoelectron spectroscopy (XPS) results indicated that the UV irradiation results in the covalent bonding between the polymer and the substrate, which renders more ordered packing of polymer chains and thus the appropriately small interchain distance. As a result, the small water molecules penetrate the polymer network while large oil molecules do not. As a result, the oil contact angle is larger than the water contact angle and the coating shows the simultaneous oleophobicity/hydrophilicity. Moreover, we also demonstrated that this nanometer-thick simultaneously oleophobic/hydrophilic coating has improved long-term antifogging performance and detergent-free cleaning capability and is mechanically robust. The photochemical approach established here potentially can be applied on many other polymers and greatly accelerate the development and application of simultaneously oleophobic/hydrophilic coatings.

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Section: Resultssupporting

confidence: 92%

“…Indeed, it has been reported extensively in the past 25 years that UV will induce covalent bonding between PFPEs and solid substrates. − It is beyond the scope of the current paper to comprehensively review the previous results on this topic. Here we only briefly discussed the key findings.…”

Section: Resultsmentioning

confidence: 99%