Journal
POLYMERS
Volume 8, Issue 4, Pages -Publisher
MDPI AG
DOI: 10.3390/polym8040144
Keywords
polyurea; polyurethane; oxygen plasma treatment; RF power; surface modification; surface reaction mechanisms; optical emission spectroscopy; residual gas analysis; mass spectrometry
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Funding
- Slovenian Research Agency ARRS [P2-0082]
- National Science Foundation of China (NSFC) [21274083]
- [Bi-CN-10-01]
- [10-1]
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Polyurethane/urea copolymers based on poly(ethylene glycol) (PURPEG) were exposed to weakly ionized, highly reactive low-pressure oxygen plasma to improve their sorption kinetics. The plasma was sustained with an inductively coupled radiofrequency generator operating at various power levels in either E-mode (up to the forward power of 300 W) or H-mode (above 500 W). The treatments that used H-mode caused nearly instant thermal degradation of the polymer samples. The density of the charged particles in E-mode was on the order of 10(16) m(-3), which prevented material destruction upon plasma treatment, but the density of neutral O-atoms in the ground state was on the order of 10(21) m(-3). The evolution of plasma characteristics during sample treatment in E-mode was determined by optical emission spectroscopy; surface modifications were determined by water adsorption kinetics and X-ray photoelectron spectroscopy; and etching intensity was determined by residual gas analysis. The results showed moderate surface functionalization with hydroxyl and carboxyl/ester groups, weak etching at a rate of several nm/s, rather slow activation down to a water contact angle of 30 degrees and an ability to rapidly absorb water.
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