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Polymers 2018, 10(5), 534; https://doi.org/10.3390/polym10050534

The Relationship between Bulk Silicone and Benzophenone-Initiated Hydrogel Coating Properties

1
University Medical Center Groningen, Department of Biomedical Engineering-FB40, W.J. Kolff Institute for Biomedical Engineering and Materials Science-FB41, University of Groningen, A. Deusinglaan 1, 9713 AV Groningen, The Netherlands
2
Engineering and Technology Institute Groningen, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
3
Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
*
Author to whom correspondence should be addressed.
Received: 21 April 2018 / Revised: 4 May 2018 / Accepted: 9 May 2018 / Published: 16 May 2018
(This article belongs to the Special Issue Microgels and Hydrogels at Interfaces)
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Abstract

Polydimethylsiloxane (PDMS) is a silicone elastomer-based material that is used in various applications, including coatings, tubing, microfluidics, and medical implants. PDMS has been modified with hydrogel coatings to prevent fouling, which can be done through UV-mediated free radical polymerization using benzophenone. However, to the best of our knowledge, the properties of hydrogel coatings and their influence on the bulk properties of PDMS under various preparation conditions, such as the type and concentration of monomers, and UV treatment time, have never been investigated. Acrylate-based monomers were used to perform free radical polymerization on PDMS surfaces under various reaction conditions. This approach provides insights into the relationship between the hydrogel coating and bulk properties of PDMS. Altering the UV polymerization time and the monomer concentration resulted in different morphologies with different roughness and thickness of the hydrogel coating, as well as differences in the bulk material stiffness. The surface morphology of the coated PDMS was characterized by AFM. The cross section and thickness of the coatings were examined using scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy. The dependence of coating development on the monomer type and concentration used was evaluated by surface hydrophilicity, as measured by water contact angle. Elongation-until-break analysis revealed that specific reaction conditions affected the bulk properties and made the coated PDMS brittle. Therefore, boundary conditions have been identified to enable high quality hydrogel coating formation without affecting the bulk properties of the material. View Full-Text
Keywords: benzophenone; coatings; hydrogel; PDMS; UV-mediated free radical polymerization; mechanical properties benzophenone; coatings; hydrogel; PDMS; UV-mediated free radical polymerization; mechanical properties
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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. (CC BY 4.0).

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Keskin, D.; Mokabbar, T.; Pei, Y.; van Rijn, P. The Relationship between Bulk Silicone and Benzophenone-Initiated Hydrogel Coating Properties. Polymers 2018, 10, 534.

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