Physical, Chemical and Morphological Characterization of Polyamide Fabrics Treated with Plasma Discharge

Abstract

In this work, physical, chemical and morphological modifications of three different polyamide 6.6 (PA6.6) fabrics were investigated using double barrier dielectric (DBD) plasma treatment. Several techniques of characterization were used to study the effects caused by the interaction between plasma discharge and polyamide fabrics, such as: contact angle, water drop adsorption, Energy Dispersive Spectroscopy (EDS), X-ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscopy (SEM), whiteness by Berger degree and tensile strength. All analyses performed in this study showed that DBD plasma discharge, when applied on PA6.6 fiber, produces significant modifications on the surface of this substrate, without altering its intrinsic properties, thus proving the effectiveness of this important technology to the textile industry.

Plasma Treatment of Polyamide Fabric Surface by Hybrid Corona-Dielectric Barrier Discharge: Material Characterization and Dyeing/Washing Processes

“…It is possible to observe that after 30 min of the treatment the WCA increased to 66°, after 120 min the WCA increased to 83º and, finally, after 25h the WCA achieved the value of 105º. The hypotheses considered for this so-called hydrophobic recovery are based on subtle phenomena such as the dynamic behavior of the surface of polymers or mechanisms such as surface contamination and molecular dissociation 9,19 . Oliveira et al also observed WCA reduction after plasma treatment of three different types of commercial polyamide fabrics treated.…”

“…Thus, plasma technology can be considered a green technology because reduces energy and water consumption 4,6,7 . As result, non-thermal plasmas have been increasingly used to improve textile surface properties, such as wettability, surface adhesion, and printing capacity, without increasing its temperature and, consequently, maintaining unaffected the intrinsic properties of the bulk material 4,6,8,9 .…”

“…The DBD is a non-thermal plasma consisting of the air ionization at atmospheric pressure, generated by a high voltage and low-frequency source, and when applied to textile processing modifies the surface properties of natural and synthetic fibers by several forms of interactions, such as electrons and ions, radicals, UV radiation, among others 9 . As a consequence of the interactions between plasma and textile substrate, some surface effects may be observed such as surface etching, chain scission, polymerization, creation of polar groups and surface roughness 9,15 . In addition, these treatment effects have shown to be susceptible to the operational parameters such as electrode geometry, gas type, and flow, and dosage, as well as the characteristics of the surface to be treated.…”

“…The required pH to achieve good exhaustion of dye in the fiber must be carefully controlled and sometimes is excessively low. To achieve better dyeing results in PA fibers some trials are reported in the literature using new techniques for structural changes, being irradiation through lasers 17 or plasmas 9,16 presented as a promising solution.…”

Editors' Choice—Review—Cobalt Thin Films: Trends in Processing Technologies and Emerging Applications

“…The data presented should be viewed by the reader as guide, but should not be taken as specific to any particular Co thin film formed by any of the techniques discussed herein. The information is meant to represent relevant, albeit not absolute, properties of Co films obtained at temperatures in the range of 20 • -100 • C, with the obvious The data reported here is compiled from various sources 68,[70][71][72][73][74] and should be viewed as guideline data for Co properties rather than absolute values. * Film resistivity/dielectric properties highly dependent on film thickness and purity level.…”