Effect of the type of plasma on the polydimethylsiloxane/collagen composites adhesive properties |
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| Affiliation: | 1. Facultad de Ingeniería Química – UADY, Periférico Norte Kilómetro 33.5, Col. Chuburna de Hidalgo Inn, C.P. 97203 Mérida, Yucatán, México;2. Centro de Investigación Científica de Yucatán, Calle 43 No. 130, Col. Chuburna de Hidalgo, C.P. 97203 Mérida, Yucatán, México;3. Centro de Investigación y de Estudios Avanzados del IPN – Unidad Mérida, Km. 6 Antigua Carretera a Progreso A.P. 73, Cordemex, C.P. 97310 Mérida, Yucatán, México;1. College of Materials Science and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China;2. Department of Chemical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK;3. Centro/Departamento de Física, Universidade do Minho, 4710-057 Braga, Portugal;4. Department of Industrial Engineering and INSTM Research Unit, University of Trento, Via Sommarive 9, 38123 Trento, Italy;5. Ocean College, Zhejiang University, Zhoushan 316021, China;1. Materials Science and Engineering Program, University of California, San Diego, La Jolla, CA 92093, USA;2. Biomedical Innovation Department, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Carretera Ensenada-Tijuana No. 3918, Zona Playitas, C.P. 22860, Ensenada, Baja California, México;3. Department of Mechanical and Aerospace Engineering, University of California, San Diego, La Jolla, CA 92093, USA;1. Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China;2. Department of Materials Science and Engineering, University of Washington, Seattle, WA 98195, USA;1. Centro de Investigación Científica de Yucatán A.C, Unidad de Materiales, Calle 43 No. 130 x 32 y 34, Col. Chuburná de Hidalgo, C.P. 97205, Mérida, Yucatán, Mexico;2. Centro de Investigación Científica de Yucatán A.C, Unidad de Energía Renovable Carretera Sierra Papacal, Chuburná Puerto, Km 5, Sierra Papacal, C.P. 97302, Mérida, Yucatán, Mexico |
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| Abstract: | Polydimethylsiloxane (PDMS) films were treated with either oxygen (O2), nitrogen (N2) or argon (Ar) plasma between 40 W and 120 W for 5–15 min and their surface properties studied by contact angle measurements, infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and atomic force microscopy (AFM). Lower contact angles and increases in surface roughness, assessed by SEM and AFM, were observed for all used gases when plasma power and time increased, with argon treatment being the one that showed the most significant change in roughness.PDMS/collagen type I composites obtained after treating PDMS with oxygen at 80 W for 13 min or nitrogen and argon at 80 W for 14 min showed a peel strength of 0.1N/mm (oxygen plasma), 0.08 N/mm (nitrogen plasma) and 0.09 N/mm (argon plasma). In all cases, peel strength was higher than that measured for the untreated bilayer composite. An increase in adhesion strength, after oxygen and nitrogen plasma, was mostly attributed to chemical interaction between functional groups introduced on the PDMS surface and the functional groups on collagen as detected by FTIR. In contrast, the high peel strength observed on PDMS treated with argon plasma was attributed to its increased roughness which in turn increased mechanical interlocking. The properties of these composites render them suitable for adhesive free skin substitutes. |
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| Keywords: | Surface treatment by excited gases Adhesion by chemical bonding Adhesion by mechanical interlocking Peel test Composite |
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