Please use this identifier to cite or link to this item: https://ir.sc.mahidol.ac.th/handle/123456789/819
Title: Hydrophobic thiol-ene surfaces fabricated via plasma activation and photo polymerization.
Authors: Vuthichai Ervithayasuporn
Keywords: Acetone;Alumina;Coatings;Dielectric materials;Electric discharges;Hydrophobicity;Photopolymerization;Plasma applications;Plasma polymerization;Plastic coatings;Polymerization;Substrates;Surface roughness;Thallium compounds
Issue Date: 2017
Publisher: Institute of Physics Publishing
Citation: เคมี
Series/Report no.: Volume 901, Issue 1;Article number 012164
Abstract: Alumina, such as glazed alumina for electrical insulator, operated in an open field subjects to a very harsh condition; resulting in lifetime shortening. Coating hydrophobic layer on alumina surface can help prolonging its lifetime. In this study, 25 ×25 mm alumina sheets were used as substrates. The hydrophobic composite polymers were prepared from (3-mercaptopropyl)trimethoxysilane(MPTMS), 2,4,6,8-tetramethyl-2,4,6,8tetravinylcyclotetra siloxane(TMTVSi), pentaerythritoltetra(3-mercaptopropionate)(PETMP), 2,2-dimethoxy-2-phe nylaceto phenone(photoinitiator) and heptadecafluorodecylmethacrylate(HEFDMA) via the thiol-ene reaction. The alumina sheets were first activated by dielectric-barrier discharge plasma to improve its adhesion. All the polymers were found to optimize at the ratio of (MPTMS:TMTVSi:PETMP:HDFDMA) to 4:2:1:2 for coating on the alumina substrate. To enhance polymerization, 2,2-dimethoxy-2-phenylaceto phenome was also used as a photoinitiator A proper mixing sequence in the thiol-ene reaction results in film with excellent surface retention after prolong soaking in solvent such as acetone. FTIR shows that S-H and C=C functional groups have significantly changed after photopolymerization and thermally cured. The static contact angle increase from mere 53.0°±1.5° of the uncoated substrate to 120.0°±1.2° after coating. SEM shows the film with clear appearance of a few-micron thick. Under AFM, the coated surface roughness was about 9.3 nm with evenly distributed spikes of a few nanometer in height. The cross-cut test also confirmed the film was very smooth and none of the square of the films detached.
Description: http://iopscience.iop.org/article/10.1088/1742-6596/901/1/012164/meta
URI: https://ir.sc.mahidol.ac.th/handle/123456789/819
ISSN: 17426588
Appears in Collections:Chemistry: International Proceedings

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