Contact Angle Goniometry Protocols for Polyolefin Lamination Adhesion Verification
Sessile contact angle goniometry isolates polar and dispersive surface energy to verify polyolefin corona treatment and prevent lamination delamination.
Diiodomethane
Chemical Probe
Non-polar organic liquid compounds provide the baseline for determining the dispersive component of substrate surface energy. In testing paperboard and polymer coatings, diiodomethane acts as the standard diagnostic liquid due to its high surface tension and lack of polar interactions. This compound has a surface tension of fifty point eight milliNewtons per meter, which is almost entirely dispersive.
Testing laboratories apply the liquid to assess how coatings will receive inks and adhesives.
Contact Behavior
Droplet shape analysis on paper substrates requires a liquid that does not immediately absorb into the wood fibres. When deposited onto a barrier-coated paperboard, diiodomethane remains on the surface long enough for a camera to capture the contact angle. The measured angle reveals the wetting behavior.
Surface Characterization
Solid surface energy calculations combine the measurements of multiple probes to predict bonding performance on a converting line. By pairing the dispersive values of diiodomethane with the polar values of ultra-pure water, a technician calculates the total surface energy through the Owens-Wendt theory. This calculation helps packaging manufacturers prevent problems with adhesive failure or ink flaking during high-speed printing runs.
The resulting data determines whether a corona treatment or chemical priming step is required on the extrusion line.