Plasma polymerization hexamethyldisiloxane

Another illustrative example of the application of FTIR spectroscopy to problems of interest in adhesion science is provided by the work of Taylor and Boerio on plasma polymerized silica-like films as primers for structural adhesive bonding [15]. Mostly these films have been deposited in a microwave reactor using hexamethyldisiloxane (HMDSO) as monomer and oxygen as the carrier gas. Transmission FTIR spectra of HMDSO monomer were characterized by strong... 

There has been a great deal of interest in the study of the electrical properties of plasma polymerized films. Early data on the dielectric and conductivity of the films has been reviewed by Mearns ( ). More recently, the dielectric properties of plasma polymerized styrene (69-71), acrylonitrile (72), hexamethyldisiloxane (73-75), tetrafluoroethylene... 

The chemical structure of polymerized hexamethyldisiloxane was studied by spectroscopic means such as IR, XPS, and NMR [53]. The plasma polymer was barely... 

Electronic interaction of chromophores prone to stacking and aggregation, for example, weso-tetraphenyl porphyrins (TPPs), can also be suppressed by mechanically incorporating and site-isolating the chromophores in a polysilox-ane matrix prepared by atmospheric-pressure plasma polymerization of the metalloporphyrins and hexamethyldisiloxane [10,11]. 

Figure 19.8 shows the pH-dependence of zeta potential in ImM NaCl for three plasma polymer surfaces having different functional characteristics. The respective surfaces of this figure are plasma-polymerized acrylic acid, hexamethyldisiloxane (HMDSO) and 1,2-diaminocyclohexane (DACH). It is evident from the figure that these surfaces have very different electrokinetic surface properties. This pH-dependence clearly... 

Recently, we have studied a variety of sandwich type electrodes for development of enzyme electrodes based on oxidases. In this paper, we focused on extending linearity and blood-compatibility of the outer membrane, i.e., polycarbonate (PC) membrane, without affecting the selectivity. We modified the outer surface of this membrane by plasma polymerization of hexamethyldisiloxane (HMDS) in a glow-discharge reactor or by coating with polyvinylalcohol (PVAL). The PVAL coated surfaces were further treated with an anticoagulant, i.e., heparin. We studied the linearity, selectivity and blood-compatibility of these membranes and related electrodes. Here, we present the results of these studies. 

Ways have been investigated to reduce or avoid leaching of plasticizers. Barreto et al. (2012) deposited a barrier coating onto PVC, resulting in a reduction of more than 80% of leaching of the plasticizer. The barrier was established by means of plasma-activated CVD used to polymerize octamethylcyclotetrasiloxane (OMCTS) and hexamethyldisiloxane (HMDSO). Covalent bonding of the plasticizer to PVC... 

Depending on the plasma processes conditions, it is possible to obtain hybrid (organic-inorganic) films. In addition, gradient films from the outer surface to the substrate can be obtained changing the process conditions. For instance, the 02/hexamethyldisiloxane (HMDS) ratio has a great infiuence on the resulting plasma polymers obtained in the polymerization of HMDS, as determined by infrared spectroscopy. The infrared spectra of the HMDS monomer and two siloxane plasma... 

---