On the use of CO2 laser induced surface patterns to modify the wettability of Poly(methyl methacrylate) (PMMA)

Waugh, David and Lawrence, Jonathan (2010) On the use of CO2 laser induced surface patterns to modify the wettability of Poly(methyl methacrylate) (PMMA). Optics and Lasers in Engineering, 48 (6). pp. 707-715. ISSN UNSPECIFIED

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Official URL: http://dx.doi.org/10.1016/j.optlaseng.2010.01.005

Abstract

CO2 lasers can be seen to lend themselves to materials processing applications and have been used extensively in both research and industry. This work investigated the surface modification of PMMA with a CO2 laser in order to vary the wettability characteristics. The wettability characteristics of the PMMA were modified by generating a number of patterns of various topography on the surface using the CO2 laser. These induced patterns were trench and hatch with scan dimensions of 50 and 100 μm. Through white light interferometry it was found that for all laser patterned samples the surface roughness had significantly increased by up to 3.1 μm. The chemical composition of selected samples were explored using X-ray photoelectron spectroscopy and found that the surface oxygen content had risen by approximately 4% At. By using a sessile drop device it was found that, in comparison to the as-received sample, 50 μm dimensions gave rise to a more hydrophilic surface; whereas 100 μm dimensions gave rise to either no change in contact angle or an increase making the PMMA hydrophobic. This can be explained by combinations of surface roughness and γp contributing to the observed contact angle, in addition to the possibility of different wetting regimes taking place owed to the variation of topographies over the as-received and laser patterned samples.

Item Type:Article
Additional Information:CO2 lasers can be seen to lend themselves to materials processing applications and have been used extensively in both research and industry. This work investigated the surface modification of PMMA with a CO2 laser in order to vary the wettability characteristics. The wettability characteristics of the PMMA were modified by generating a number of patterns of various topography on the surface using the CO2 laser. These induced patterns were trench and hatch with scan dimensions of 50 and 100 μm. Through white light interferometry it was found that for all laser patterned samples the surface roughness had significantly increased by up to 3.1 μm. The chemical composition of selected samples were explored using X-ray photoelectron spectroscopy and found that the surface oxygen content had risen by approximately 4% At. By using a sessile drop device it was found that, in comparison to the as-received sample, 50 μm dimensions gave rise to a more hydrophilic surface; whereas 100 μm dimensions gave rise to either no change in contact angle or an increase making the PMMA hydrophobic. This can be explained by combinations of surface roughness and γp contributing to the observed contact angle, in addition to the possibility of different wetting regimes taking place owed to the variation of topographies over the as-received and laser patterned samples.
Keywords:CO2 laser, PMMA, Wettability, Surface modification
Subjects:F Physical Sciences > F200 Materials Science
F Physical Sciences > F830 Topography
F Physical Sciences > F361 Laser Physics
J Technologies > J410 Polymers Technology
Divisions:College of Science > School of Engineering
ID Code:3337
Deposited By: David Waugh
Deposited On:14 Sep 2010 08:43
Last Modified:13 Mar 2013 08:46

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