Plasma polymerisation of siloxanes at atmospheric pressure

Abstract

This work deals with the plasma polymerisation of two siloxane precursors, [hexamethyldisiloxane (HMDSO) and tetramethyldisiloxane (TMDSO)] with an atmospheric pressure pseudoglow dielectric barrier discharge operated in argon and an argon-air mixture. The influence of gas composition and precursor type on the physical and chemical properties of the deposited films is examined in detail using contact angle measurements, Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM). Results clearly show that precursor type as well as gas composition has an profound impact on film growth rate and chemical composition of the deposited films. Plasma polymerisation of both siloxane precursors in argon leads to the formation of hydrophobic polymers consisting of a Si-O-Si backbone, while for deposition in an argon-air mixture, hydrophilic inorganic silica-like coatings are obtained

The use of DBD plasma treatment and polymerization for the enhancement of biomedical UHMWPE

“…eV for the C-O bond and 288.9 eV for the O-C=O bond [17,36]. A general presentation of this curve fit on commercial PMMA can be found in Fig 5 (down) and is similar to the C1s curve fit of plasma polymerised PMMA (same binding energies, different ratios).…”

“…The results depicted in influence on the deposition rate [17]. When analysing the growth rate in function of this parameter, 3 regimes can be distinguished.…”

“…De Geyter et al stated in 2009 that an increase in discharge power or a decrease in monomer concentration leads to a higher fragmentation rate of the monomer and thus a loss of functionalities [17]. The results summed up in Table IV To quantify the loss of functionalities, again a curve fit of the C1s peak is done which can also be found in Table IV.…”

“…Starting with the formation of free radicals on the polymer surface during the plasma treatment, it is followed by the reaction of these free radicals with the medium that is present. [15][16][17][18][19] Past research has shown that the increase in wettability can lead to an increase in cell adhesion and proliferation. [12,20,21] Next to plasma activation, also plasma polymerization is an interesting technique to change the properties of a material's surface.…”

“…Plasma polymers also have a strong adherence on numerous substrates. [17][18][19]22] The aim of this study is to use both plasma treatment and plasma polymerization of methyl methacrylate (MMA) on an UHMWPE surface to improve its bioactivity and adhesive properties. As mentioned before, plasma treatment will turn an inert UHMWPE surface into an activated surface.…”