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. 2015 Oct 30;7(4):471–485. doi: 10.3390/pharmaceutics7040471

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© 2015 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

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(a) Water contact angle PEEK before and after 10 and 30 min of oxygen plasma treatment; (b) graph showing water contact angle with plasma treatment time for PEEK and PC; (c) bar graph showing the polar (σ^P) and dispersive (σ^D) component of the surface energy of the three polymers before and after plasma treatment calculated using Owens/Wendt theory.