Polymer-bearing surfaces interactions

KLEIN ET AL.. Interactions Between Polymer-Bearing Surfaces 239... 

Understanding the state and behavior of water in the vidnity of solid surfaces and particularly under confinement is fundamental to the quantitative understanding of many processes mediated by polymers in cdl biology and living tissues. In particular, we shall later consider modification of normal and frictional interactions between polymer-bearing surfaces where the hydration state of the monomers plays a cmdal role, in a mechanism termed liydration lubrication for this reason, we describe in some detail interactions across thin aqueous films and hydrated ions. 

The polymer volume fraction, , as a function of the distance, z, away from the substrate, provides an important means to evaluate the interaction between polymer-bearing surfaces. In the case of adsorbed polymers, there are three regions (Figure 4). In the proximal region (z is uniform. In this region, most of the polymer is attached to the substrate. The second region is the central region and its profile is universal in the sense that is... 

Adherent, conformal LPD ceramic film either crystalline (Method 2) or amorphous (Method 1) can be obtained on polyimides. This is in contrast to silanol-bearing surfaces (good for Method 1 only) or sulfonated surfaces (good for Method 2 only). The fact that the polyimides accommodate both titania preparations may be due to the partial hydrolysis of the polymer surface under oxide deposition conditions. This provides a mix of carboxylic acid and amide sites that anchor the titania by a combination of coulombic and chelation-based effects.22 An important lesson of this work is that the interaction of the polymer surface with the deposition solution may create oxide film anchoring sites. This does not negate activating the polymer surface. It recognizes that the polymer surface can react further under the deposition conditions. 

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