Improving Adhesive Bonding of Composites Through Surface Characterization Using Inverse Gas Chromatography (IGC) Methods
Surface preparation is essential in the adhesive bonding process for composite materials. Surface energy measurement is one promising technique to characterize and inspect prepared surfaces for optimal surface conditions prior to bonding. Two popular methods for surface energy measurement are contact angles and Inverse Gas Chromatography (IGC). Contact angles are measured from a side view of the drop using a video goniometer. IGC, while well-known for measuring the surface energies of powders, is a relatively new method for characterization of the surface energy of composite materials. This dynamic technique outputs the composite’s dispersive, specific (acid-base), and total (dispersive + specific) surface energies. Various adsorptive molecules are passed along the prepared surfaces to calculate several physico-chemical properties of the composite material (absorbent). In this study, surface energies were reported on Toray 3900/T800 6K composite panels with various peel ply surface preparations including: (1) Precision Fabric Group 60001 polyester, (2) Precision Fabrics Group’s Nylon Peel Ply 52006, (3) DIATEX 1500EV6 Polyester Peel Ply, (4) Henkel EA9895 0.033psf Wet Peel Ply (WPP), (5) Cytec Solvay MXB-7668, and (6) fluorinated ethylene propylene (FEP). Surface energy measurements taken via IGC are compared with surface energy data generated from contact angle measurements and discussed for the different surface preparations.
Author: Rita Taitano Johnson, Kay Blohowiak, John Osborne, Ryan Wilson, and Brian D. Flinn
Conference: SAMPE Seattle 2017