Plasma-treated polymer surfaces functional groups

A great deal of research has been focused on the evaluation of plasma polymers and plasma treated materials for blood and soft tissue contacting-applications (2,3). A number of studies have involved the physical adsorption or covalent attachment of a variety of biomolecules to various gas plasma-treated polymer surfaces (4,5). In such studies, however, the covalent immobilization is often assumed to take place through precursor groups formed at the biomaterial surface from ill-defined oxygen and nitrogen functionalities obtained directly from the plasma. 

Rearrangement of Functional Groups of Plasma-Treated Polymer Surfaces by Contact Angle Measurements... 

Plasma treatment is one of most common and suitable surface modification techniques for polymeric materials. This treatment can selectively introduce certain functional groups at a polymer sur ce with little damage to the bulk of the polymer. However, it is known that a plasma-treated polymer surface loses its properties gradually with aging. One reasonable explanation for this phenomenon is that the nctional groups, introduced by plasma treatment, rotate or move away from the surface into the bulk. Thus the changing surface properties may reflect... 

In this study, the changes of water contact angles on plasma-treated polymer surfaces were investigated in detail, and the relationship between the rearraiigement of the surface functional groups and the viscoelasticity of the polymer was investigated. 

To realize surface-bonded initiating sites or their precursors, a variety of methods are applicable. Either organic (polymer) surfaces are irradiated or plasma treated to yield suitable functional groups [187, 195] or inorganic supports are covered with an interlayer of functional polymers bearing the desired groups. However, to gain control over the quantity of surface reaction sites and define the surface chemistry, interlayers of low molar mass a,co-functionalized surface active compounds are suit-... 

Fig. 11 Dependence of Al-polymer peel strengths on type of polymer surface modification (thick lines - adhesion-promoting plasma polymers, thin dotted lines - O2 plasma treated) and concentration of functional groups at polymer surfaces...

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