Superhydrophobic polymeric coatings produced by rapid expansion of supercritical solutions combined with electrostatic depostion (RESS-ED) [Elektronisk resurs]

• In this paper we present a method to produce superhydrophobic polymeric coatings by combining the rapid expansion of supercritical solutions (RESS) with electrostatic deposition (ED). A copolymer, poly(vinyl acetate)-poly(vinyl pivalate) was dissolved in a mixture of supercritical carbon dioxide and acetone and sprayed through a nozzle with an applied voltage of 8 kV onto a surface placed on a earthed collector. Spray distance and polymer concentration were altered to find the most suitable spraying conditions. Superhydrophobic surfaces were produced when spraying both with and without a voltage, although the water repellent surfaces could be produced at a larger variety of processing parameters using the RESS-ED technique. The greatest improvement of using the RESS-ED process was that larger and thinner coatings were produced with a more even surface coverage of the created polymer particles compared to spraying without the applied voltage. 

Ämnesord

Natural Sciences  (hsv)

Chemical Sciences  (hsv)

Polymer Chemistry  (hsv)

Naturvetenskap  (hsv)

Kemi  (hsv)

Polymerkemi  (hsv)

Indexterm och SAB-rubrik

Acetone

Carbon dioxide

Deposition

Electric grounding

Electromagnetic wave emission

Electrostatic coatings

Electrostatics

Hydrophobicity

Plastic coatings

Polymers

Supercritical fluid extraction

Volatile fatty acids

Electrostatic deposition

Poly(vinyl pivalate)

RESS

Supercritical solution

Superhydrophobic coatings