Abstract
This work attempts to modify the hydrophilic-adherence properties of polydimethylsiloxane (PDMS) by exposing to oxygen beam for used in painting, printing, and clothing applications. The structural and morphology changes of irradiated PDMS films are analyzed using XRD and SEM, respectively. The chemical functional group is investigated by Fourier infrared spectroscopy (FTIR). The contact angle for water is reduced from 81.38 degrees to 42.50 degrees, while the contact angle for diiodomethane is reduced from 63.20 degrees to 25.40 degrees by varying the irradiation time from 1.5 to 6 min. On the other hand, for water liquid, the adhesion work is enhanced from 82.75 to 125.5 mJ/m(2), and for diiodomethane liquid, it's increased from 73.70 to 96.68 mJ/m(2). Moreover, the polar energy gamma(p)(s) is enhanced from 6.44 to 20.25 mJ/m(2), while, the gamma(d)(s) is increased from 26.73 to 46.01 mJ/m(2), and the total gamma(t)(s) is increased from 33.18 to 66.26 mJ/m(2) by enhancing exposing time 1.5-6 min. The improvement in the adhesion and surface energy of the irradiated PDMS films is due to oxygen ion beam induced decreasing in PDMS surface hydrophobicity. The experimental data show the surface morphology, structure and surface properties of treated PDMS are modified and depend closely on the oxygen beam irradiation time.
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