Results of Testing Barrier Dressings on Agar Plates

6 Physical Properties of Barrier Dressing Materials 2.6.1 Results of Testing Barrier Dressings on Agar Plates 

This study consisted of applying coating or films of dressing material on agar plates to determine the applicability of wounded tissue which is moist and very hydrophilic, conditions that usually do not provide good properties for adhesive substrates (i.e., adherent). 

The importance of surface energy involves the wetting properties of a liquid when applied on a solid and, in this case, adhesives applied to tissue. The adhesive must spread on the surface to the very hydrophilic, irregular contoured and moist tissue in order to adhere to the tissue and provide a continuous barrier. A liquid must possess a surface energy less than that of the substrate to wet, spread, and adhere to the substrate, otherwise, it will bead and not form a bond with the substrate. For the reader s information, secondary bonds are the forces between adhesives and substrates including hydrogen. 

SURFACE ENERGY VS. PERCENT ETHANOL IN WATER (Contact Angle Method) 

A major problem with natural biocompatible materials (collegan, chitosa, etc.) used for tissue barriers is that they absorb water and are permeable to water soluble/ 

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