Effect of corona discharge on the stability of the adhesion of thin silicone-organic coating to polyamide fiber surface made by the sol\u2013gel method

Dorota Kowalczyk,Irena Kamińska

doi:10.1007/s11998-016-9899-9

Dorota Kowalczyk, Irena Kamińska

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https://doi.org/10.1007/s11998-016-9899-9

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This paper presents the effect of pretreatment of polyamide (PA6) nonwoven with corona discharge on the stability of the adhesion of thin hydrophobic silicone-organic coating based on vinyltriethoxysilane, made by the sol–gel method. This pretreatment with corona discharge causes a change in the physicochemical properties of the PA6 fiber surface. These changes include, among others, an increase in the fiber surface roughness, wettability, and surface free energy. At the same time, XPS and EDS investigations have shown an increase in the degree of oxidation and the formation of functional polar groups on the fiber surface (C–O–, C–OH, and O=C–O–). As a result of the changes in the surface properties of pretreated PA6 fibers, a higher degree of the sol deposition was obtained compared with that for untreated nonwoven surface. The assessment of the stability of the adhesion of thin hydrophobic coating to the fiber surface was carried out on the basis of changes in the content of silica deposited on fibers and the kinetics of water contact angle after washing and abrasion processes. In the end, the PA6 nonwoven, pretreated with corona discharge, shows a higher stability of the adherence of the thin silicone-organic coating and a higher degree of hydrophobicity than the untreated nonwoven.

Highlights

The formation of thin functional coatings from polymeric organic–inorganic hybrids, mostly based on silica (SiO2) on the surfaces of fibers/fabrics, constitutes a quickly developing area of improving textiles for various applications
In the case of forming thin silicone-organic coatings on the fiber surface by the sol–gel method, when an appropriately synthesized sol is deposited on the fabric by padding, it is the hydrophilic character of fibers that is of great importance for the quantity and uniformity of the sol deposition and for the properties of the nano-coating obtained
Corona discharge causes a change in the physicochemical properties of the polyamide fiber surface, especially an improvement in wettability, an increase in surface free energy, formation of functional groups, an increase in the oxidation degree of fiber surface, an increase in the adhesion work, and an increase in the roughness of the fiber surface

Summary

Introduction

The formation of thin functional coatings from polymeric organic–inorganic hybrids, mostly based on silica (SiO2) on the surfaces of fibers/fabrics, constitutes a quickly developing area of improving textiles for various applications. In the case of relatively thick coatings (20–120 lm) made of organic film-forming polymers deposited in the form of paste on the textile fabric, the assessment of the coating stability and its adhesion to the textile carrier is carried out by selected functional tests, including resistance to water penetration, bending and abrasion resistance, resistance to multiple crushing/bending, and multiple standardized laundering.[30] The wrinkles, cracks, delamination, and wear of the coating resulting from these treatments are assessed by the organoleptic method or by means of microscopic images The use of such methods is possible owing to the high thickness of the coating made in this way on the fabric surface and not on single fibers. Based on the 3D topography of fabric surface, the parameters of its roughness were determined:

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