Computer Assisted Gas Chromatography for Thermodynamic Measurements of Polymer Surfaces,
Abstract
Accurate measurement of the surface thermodynamics of polymers is essential if one is to understand how polymeric fibres such as Kevlar interact with the matrix in fibre reinforced composites. The term surface thermodynamics includes quantities such as enthalpies of adsorption, entropies of absorption, absorption isotherms, surface areas and spreading pressures. Gas chromatography lends itself to the determination of these quantities because: it can be carried out at low concentrations of absorbate (the infinite dilution regime), it does not need to be carried out under a vacuum, and its accuracy is as good as, or better than, the accuracy of alternate methods, e.g. calorimetry. This report documents the development of a system, based on an existing gas chromatograph and multichannel analyser, for digital acquisition and analysis of chromatographic data. A brief outline of the theory is followed by a section detailing specific requirements. The bulk of the report, describing the development of the system, follows, with some results illustrating its capabilities. Finally, an extensive set of appendices gives technical details.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1985
- Accession Number
- ADA167450
Entities
People
- P. J. C. Chappell
Organizations
- Defence Science and Technology Group