Abstract
Fluorinated polymers or chemicals with long length of fluorinated tail are often used to enhance the hydrophobicity and oleophobicity of surfaces. In this work, superhydrophobic and highly solvent-repellent surfaces were fabricated by using a series of block copolymers with 3,3,3-trifluoropropyl substituted siloxane segments via an electrospinning process. The contact angles of deionized water on the electrospun films are higher than 150° and the water roll-off angles are less than 10°, denoting a superhydrophobic property for the electrospun films. The electrospun films can also exhibit contact angles higher than 150° for glycerol, formamide, and diethylene glycol. Moreover, it is surprising to find that very high contact angles with small roll-off angles on the electrospun films could be obtained by using the oil liquids colored by 0.4 wt % oil-soluble dyes. By investigating the properties of the thin/electrospun films of block copolymers, it is found that the microphase-separation behavior of block cop...
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