Use of statistical design of experiments in the optimization of Ar-O2 low-pressure plasma treatment conditions of polydimethylsiloxane (PDMS) for increasing polarity and adhesion, and inhibiting hydrophobic recovery

- Design of experiments is effective in optimizing the LPP treatment conditions of PDMS.
- Working pressure in LPP treatment affects markedly the hydrophobic recovery (ageing) of PDMS.
- Low power and long duration of LPP treatment retard ageing.
- Use of Ar + O2 mixtures for LPP treatment of PDMS is more efficient than Ar or O2 only.
- Surface modifications of LPP treated PDMS under optimal conditions are maintained for 14 days.