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International Journal of Polymer Science
Volume 2015 (2015), Article ID 721035, 7 pages
Research Article

Rapid Fabrication of Periodic Patterns on Poly(styrene-co-acrylonitrile) Surfaces Using Direct Laser Interference Patterning

1Department of Chemistry, National University of Río Cuarto, Route 36, km 601, 5800 Rio Cuarto, Argentina
2Faculty of Engineering, National University of Río Cuarto, Route 36, km 601, 5800 Rio Cuarto, Argentina
3Fraunhofer Institute for Material and Beam Technology, Winterbergstraße 28, 01277 Dresden, Germany
4Technische Universität Dresden, Institute of Manufacturing Technology, George-Bähr-Straße 3c, 01069 Dresden, Germany

Received 1 January 2015; Accepted 12 February 2015

Academic Editor: Angel Concheiro

Copyright © 2015 Martin F. Broglia et al. 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.


Periodic microstructures in styrene-acrylonitrile (SAN) copolymers are fabricated by two-beam direct laser interference patterning using a nanosecond pulsed laser operating at a wavelength of 266 nm. The SAN copolymers are synthesized using different molar ratios (styrene to acrylonitrile) by a free radical polymerization process. The chemical composition of the copolymers and their properties are determined using Fourier transformed infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC). Depending on the composition of the irradiated copolymer films, with weight ratios ranging from 58 to 96.5% of styrene to acrylonitrile, different ablation behaviors are observed. The laser fluence necessary to locally ablate the copolymer is found to be dependent on the copolymer composition. Unlike other dielectric polymers, the laser irradiation produced both direct ablation of the irradiated material and collapse of the surface. It is shown that, by varying the laser fluence and the copolymer composition, the surface structure can be changed from a periodic pattern with a swelled topography to an ablated-like structure. The number of holes does not depend monotonically on the amount of PS or PAN units but shows a more complex behavior which depends on the copolymer composition and the laser fluence.