Grafting amine functions to improve adhesion
Plasma surface treatment, as a complex technology based on chemical reactions, is leading to extreme surface modifications. Thus it is very difficult to measure plasma treatment efficiency with simple and quick tests. In most cases, surface energy is a good indicator to prove the treatment efficiency as it is commonly shared that a surface energy improvement means a better surface wettability, which is good in printing or painting processes.
But when the objective is to improve a surface adhesion, surface energy doesn't show the real surface improvement of the plasma treatment, as explained in the “wettability vs adhesion” news. Some chemical functions that are grafted on a surface with plasma do not improve hydrophily but can improve a lot the adhesion, as do the “amine functions”.
Amine functions are polar functions. Thoses functions can be grafted on a surface with atmospheric plasma under specific processes conditions. Amine functions have the interesting property of having high affinity with some glues, which explains why adding them on a surface in some specific manufacturing processes can improve a lot the quality and strength of an adhesion.
As a new development, AcXys R&D team and its collaborators have found a new simple and quick way of testing amine functions concentration on a surface. As an incomming product release, we'll soon reveal this new measurement technique.