Rapid Hydrophilization of Model Polyurethane/Urea (PURPEG) Polymer Scaffolds Using Oxygen Plasma Treatment
AbstractPolyurethane/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 1016 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 1021 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° and an ability to rapidly absorb water. View Full-Text
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Zaplotnik, R.; Vesel, A.; Primc, G.; Liu, X.; Chen, K.C.; Wei, C.; Xu, K.; Mozetic, M. Rapid Hydrophilization of Model Polyurethane/Urea (PURPEG) Polymer Scaffolds Using Oxygen Plasma Treatment. Polymers 2016, 8, 144.
Zaplotnik R, Vesel A, Primc G, Liu X, Chen KC, Wei C, Xu K, Mozetic M. Rapid Hydrophilization of Model Polyurethane/Urea (PURPEG) Polymer Scaffolds Using Oxygen Plasma Treatment. Polymers. 2016; 8(4):144.Chicago/Turabian Style
Zaplotnik, Rok; Vesel, Alenka; Primc, Gregor; Liu, Xiangyu; Chen, Kevin C.; Wei, Chiju; Xu, Kaitian; Mozetic, Miran. 2016. "Rapid Hydrophilization of Model Polyurethane/Urea (PURPEG) Polymer Scaffolds Using Oxygen Plasma Treatment." Polymers 8, no. 4: 144.
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