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Journal of Nanomaterials
Volume 2013, Article ID 453623, 12 pages
http://dx.doi.org/10.1155/2013/453623
Research Article

Reversible Surface Properties of Polybenzoxazine/Silica Nanocomposites Thin Films

Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung 804, Taiwan

Received 17 June 2013; Revised 2 September 2013; Accepted 16 September 2013

Academic Editor: Christoph Schick

Copyright © 2013 Wei-Chen Su and Shiao-Wei Kuo. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We report the reversible surface properties (hydrophilicity, hydrophobicity) of a polybenzoxazine (PBZ) thin film through simple application of alternating UV illumination and thermal treatment. The fraction of intermolecularly hydrogen bonded O–H O=C units in the PBZ film increased after UV exposure, inducing a hydrophilic surface; the surface recovered its hydrophobicity after heating, due to greater O–H N intramolecular hydrogen bonding. Taking advantage of these phenomena, we prepared a PBZ/silica nanocomposite coating through two simple steps; this material exhibited reversible transitions from superhydrophobicity to superhydrophilicity upon sequential UV irradiation and thermal treatment.