Amorphization and Polymorphism Modification of Polyamide-6 Films via Open-Air Non-Equilibrium Atmospheric Pressure Plasma Jet Treatment

Abstract

http://www.interscience.wiley.com/International audienceSurface activation of polymers by atmospheric pressure plasma is an economically important process for bonding technologies. Although most of the studies are focused on the modification of the surface chemistry, this study investigates the modification of the topmost surface and the deeper layers of a polyamide-6 sheet treated by an open-air atmospheric plasma jet system. The plasma jet used in this study is a unique combination of highly reactive species (e.g. O8, 8OH. . .) and a high temperature gas estimated (from 600–1 000 K) which leads to surface functionalization,amorphization and polymorphism modification. The results have shown that an amorphization of the polyamide occurs on the top surface. Moreover, a crystallization of the amorphous phase in the a form was also highlighted in the depth of the material

Improvement of the Water Stability of Plasma Polymerized Acrylic Acid/MBA Coatings Deposited by Atmospheric Pressure Air Plasma Jet

“…6. These values are in good agreement with previous simulations which were compared to thermocouple measurements [24], showing that OH rotational temperatures can be used as a plasma gas thermometer. As expected, the estimated temperature increases when the discharge frequency rises and when the distance from the nozzle diminishes.…”

“…As already observed [22][23][24][25], for pure air plasma, the spectrum is dominated by the strong NO 2 [26]. When the precursor mixture is introduced, the luminescence of the plasma is more intense, as the intensity of all the peaks increases strongly.…”

Surface Treatment of Polydimethylsiloxane (PDMS) with Atmospheric Pressure Rotating Plasma Jet. Modeling and Optimization of the Surface Treatment Conditions

“…The plasma jet used in this work will modify the surface of polymers due to the contribution of reactive chemical species (O°, OH°) and heat transfer. As reported previously, the increases of surface temperature was responsible of phase transformation (surface amorphization) of plasma‐treated polyamide substrates, while O° and OH° radicals will oxidize the surface of polymers . Among the different reactive species, the emission line at 777.4 nm, which corresponds to the direct excitation of atomic oxygen by electron impact was selected to monitor the variation of the plasma chemical reactivity with the distance from the nozzle exit.…”

Plasma Polymerization of 3‐Aminopropyltrietoxysilane (APTES) by Open‐Air Atmospheric Arc Plasma Jet for In‐Line Treatments

“…Dowling et al reported a rotational temperature around 2000 ± 100 K calculated from the second positive system of nitrogen for a pulse frequency between 19–25 kHz and an air flow rate of 4600 L h −1 . Ben Salem et al reported a rotational temperature of 900 ± 100 K at 10 mm from the nozzle exit . In this work, the rotational temperature estimated on the OH (A–X) transition using the LIFBASE software is 2700 ± 100 K as shown in Figure .…”

“…[18] Ben Salem et al reported a rotational temperature of 900 AE 100 K at 10 mm from the nozzle exit. [40] In this work, the rotational temperature estimated on the OH (A-X) transition using the LIFBASE software is 2700 AE 100 K as shown in Figure 4. This temperature is significantly above the rotational temperature reported previously in the afterglow region, but still much lower than the one reported in the arc region (T rot N 2 $ 5000 K) with a similar plasma torch.…”