Volume-10 (07/2005)

Delta-8: Surfactant/polyelectrolyte interactions through surface tension

 
In this study the aggregation between polystyrenesulfonate (PSS) and cetylpyridinium chloride (CPC) was studied in aqueous electrolyte solution using Delta-8 microtensiometer. Utilizing parallel microbalances together with small diameter du-Nouy measurement rods, Delta-8 makes use of microtiter well plates allowing rapid assays and simultaneous equilibrium of the samples. This enables variation of surfactant composition in a standard 96 well plate with polymer and surfactant concentration. Surface tension measurement as a function of composition yields information on the adsorption and aggregation behavior of both the surfactant and the polyelectrolyte. The results are interpreted by the Gibbs adsorption equation and the mass action model commonly applied to surfactant polymer aggregation reactions.

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Interfacial Tension as a Predictor of the Completeness of Pore Wetting in Epoxy Resin Impregnated Non-Woven Glass

 

The manufacture of circuit boards is a major application for woven glass fabric. The glass fabric is impregnated with epoxy resin and cured to produce a board onto which circuitry is placed. The glass fabric is commonly treated by the glass manufacturer (who is usually a supplier to the actual board producer) with a coating that makes it wet well with epoxy resin and also usually has some functionality which reacts chemically with the epoxy. Acrylic, amine, and ester functionalities are common, as well as others.

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