An understanding of the bulk and surface properties of polyurethane based binder systems are critical to the manipulation of favorable interactions between a given binder system and particulates within a composite material. Inverse gas chromatography was utilized to provide surface characteristics (total surface energy, dispersive and specific or polar components, work of cohesion and/or adhesion) of solid binder samples in comparison to a series of well understood gas phase molecules. Contact angle measurements were utilized for comparison of the surface free energy of the solid binder sample and the interfacial tension (surface tension) between a liquid probe material and the solid binder surface. Primary outcomes include an increased understanding of the differences in the bulk and surface properties of the polyurethane based binder systems utilizing different measurement methods and the development of methods to characterize and evaluate new binders. Final success and progress was measured by the ability to reproducibly measure various surface energies, interactions and other properties of a series of binder systems by inverse gas chromatography and copmpare to contact angle measurements from both the laboratory and literature.

Surface energy determinations in polymer systems by inverse gas chromatography

256th National Meeting (2018)

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