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Tuesday, 17 September 2019
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Raw materials & technologies, Raw materials, Coatings binders

Tuning the wettability of hierarchical structured coatings

Tuesday, 27 January 2015

Researchers have developed a facile one-step method to fabricate hierarchical structured coatings whose wettability could be easily tuned from hydrophilic (water contact angle, 9.3°) to superhydrophobic (water contact angle, 154.2°) by controlling the assembly temperature.

The building blocks for the coatings were produced via a one-step soap-free emulsion polymerisation process accompanied by phase separation. Source: Miredi/Fotolia
The building blocks for the coatings were produced via a one-step soap-free emulsion polymerisation process accompanied by phase separation. Source...

The building blocks for the coatings, hierarchically raspberry-like poly(styrene-acrylic acid) (P(S-AA)) particles with 10nm corona particles on the core, were produced via a one-step soap-free emulsion polymerisation process accompanied by phase separation. The morphology and roughness of the raspberry-like particles can be conveniently regulated by adjusting the amount of S, AA and divinylbenzene (DVB).

Chemical composition influences the wettability

The chemical composition, crosslinking degree, hierarchical structure and roughness of the raspberry-like particles have significant influence on the wettability of the coatings. The transition of the wettability was attributed to a thermodynamic-driven process that hydrophobic components of the particles migrate toward the surface of the coatings and a decrease of the roughness of the hierarchical structure that was a result of softening and fusing of the particles at temperatures above the Tg of the copolymers.

The study is published in: Polymer Chemistry, Issue 5, 2015.

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