Free Radicals Resulting from Plasma Polymerization and Plasma Treatment

Time-related wettability characteristic of acrylic resin surfaces treated by glow discharge

“…In the plasma, there are energetic-free electrons produced at ambient temperatures, which can collide with polymer surfaces and gas molecules around to form active species both in the gas phase and on the substrate surfaces. 14 The initial wettability measurements of the attempted treatment of acrylic resin by glow discharge revealed that an apparent success could be achieved in decreasing the contact angle values compared with untreated specimens.…”

Analysis of Glow Discharges for Understanding the Process of Film Formation

“…If we assume that the trapped radicals in the films are relatedto the free radicalsproduced in the plasma it is easily recognizedthat free radical concentrationsin the plasma are lO3 to lO5 higher than the ion concentrations. Further, Morosoff et al (1976) have observed higher radical concentrationsat the surfaces of polymers exposedto a plasma. Surface free radicals are known to react with gas-phasefree radicalsand unsaturatedmolecules such as ethylene and propylene.…”

“…This was demonstratedby Yasuda (1976) and Morosoff et al (1976) by using ESR probes made of glass rods and polyethlene-coated tubes.…”

Correlated electron spin-resonance and infrared spectroscopic study of the postformation auto-oxidation phenomenon in plasma-polymerized 4-vinyl pyridine films

“…Thus, free radical species may be trapped within the plasma-produced polymer. 5 The growing polymer film is also subjected to continuous bombardment by high energy photons, electrons, and ions present in the plasma environment. These bombardment processes may also lead to free radical formation on the surface of the growing film.…”