Dyeing mechanism and optimization of polyamide 6,6 functionalized with double barrier discharge (DBD) plasma in air

- DBD plasma allows high polar functionalization of PA66, which increases wettability.
- DBD plasma preferentially breaks the CN bonds, and not aliphatic CC chain of PA66.
- Low-molecular weight acidic molecules and micro-channels favor dye penetration.
- Plasma treatment allows high level of dye diffusion and fixation on PA66 fibers.
- DBD plasma allows dyeing process at lower temperatures and shorter times.