Superhydrophobic Hierarchically Assembled Films of Diblock Copolymer Hollow Nanospheres and Nanotubes

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• 作者：Guping He ; Jiwen Hu ; Guojun Liu ; Yinhui Li ; Ganwei Zhang ; Feng Liu ; Jianpin Sun ; Hailiang Zou ; Yuanyuan Tu ; Dingshu Xiao
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：April 10, 2013
• 年：2013
• 卷：5
• 期：7
• 页码：2378-2386
• 全文大小：561K
• 年卷期：v.5,no.7(April 10, 2013)
• ISSN：1944-8252

文摘

Reported are the formation of rough particulate films from cross-linked diblock copolymer vesicles and nanotubes and the wetting properties of the resultant films. The diblock copolymers used were F₆₆M₂₀₀ and F₉₅A₁₃₅, where the subscripts denote the repeat unit numbers, whereas M, A, and F denote poly(2-cinnamoyloxyethyl methacrylate), poly(2-cinnamoyloxyethyl acrylate), and poly(2,2,2-trifluoroethyl methacrylate), respectively. The precursory polymers to F₆₆M₂₀₀ and F₉₅A₁₃₅ were prepared by atom transfer radical polymerization. In 2,2,2-trifluoroethyl methacrylate (FEMA), a selective solvent for F, vesicles and tubular micelles were prepared from F₆₆M₂₀₀ and F₉₅A₁₃₅, respectively. Photo-cross-linking the M and A blocks of these aggregates yielded hollow nanospheres and nanotubes bearing F coronal chains. These particles were dispersed into CH₂Cl₂/methanol, where CH₂Cl₂ was a good solvent for both blocks and methanol was a poor solvent for F. Casting CH₂Cl₂/methanol dispersions of these particles yielded films consisting of hierarchically assembled diblock copolymer nanoparticles. For example, the hollow nanospheres fused into microspheres bearing nanobumps after being cast from CH₂Cl₂/methanol at methanol volume fractions of 30 and 50%. The roughness of these films increased as the methanol volume fraction increased. The films that were cast at high methanol contents were superhydrophobic, possessing water contact angles of 160掳 and water sliding angles of 3掳.

Keywords:

block copolymers; self-assembly; micellization; hierarchical assembly; superhydrophobicity