Evaluation of the Yasuda parameter for the atmospheric plasma deposition of allyl methacrylate

Abstract

This work studies the influence of the proportional change in discharge power and the monomer feed on the morphology and the chemistry of atmospheric plasma deposited films. Atmospheric plasma coatings of allyl methacrylate were deposited using dielectric barrier discharge plasma under different conditions but always under the same ratio between the discharge power and monomer feed (W/FM). It is shown that a constant W/FM does not necessarily provide the same chemistry and the same morphology for atmospheric pressure plasma. This is explained by the higher discharge power of the plasma resulting in an increase of streamers which alter the distribution of energy among the plasma species. On the surface of the deposited coatings, globular-like features were observed, which are suggested to be formed in the volume of the discharge. The deposition rate is also influenced. providing thicker coatings, when high monomer feed/high power are used. Finally, infrared spectra showed a higher retention of the ester functionality at high power/high monomer feed.

Energetics of Reactions in a Dielectric Barrier Discharge with Argon Carrier Gas: III Esters

“…100–150 nm in thickness, covered by a rough top layer comprising densely grouped columnar or globular features of variable height, between 200 and 400 nm. Similar micrographs of PP AMA coatings were reported elsewhere, morphologies that suggest “powder” formation in the gas phase. In other words, this does not come as a surprise, but is a quite well‐known characteristic when highly reactive monomers like AMA or acetylene are involved …”

“…Parameters Ψ and Δ were determined at 25°, 35°, and 45° incidence angles using a J. A. Woollam RC2 ® instrument operating in the 193–1700 nm wavelength range, and were interpreted using CompleteEASE™ software and an optical model consistent with the SEM observations from (2) above …”

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

“…The highest amino groups content was obtained for conditions using the highest precursor flow rate. This behavior is consistent with the so‐called Yasuda's parameter (W/FM) but its validity was recently criticized due to the intrinsic non‐homogeneity of atmospheric plasma . The results were interpreted by using the comparison with post‐treated and ‐grafted APTES coatings.…”

Deposition Kinetics and Thermal Properties of Atmospheric Plasma Deposited Methacrylate-Like Films

“…Allyl methacrylate has a methacrylic and allylic C5 5C double bond and has been used as precursor in an atmospheric DBD reactor for the production of pdAMA films. [26][27][28][29] Based on FTIR, XPS, and solid state 13 C NMR, it was concluded that highly cross-linked pdAMA films were obtained. In comparison to AMA, the plasma deposition rate of the analogous fully saturated PiB was found to be four times lower at a constant Yasuda factor (Y f , in kJ g À1 ), i.e., input plasma power (in W) per precursor mass feed rate (in mg s À1 ).…”