Optimization of adhesive joints of low density polyethylene (LDPE) composite laminates with polyolefin foam using corona discharge plasma

Abstract

In this work, surface modification of low density polyethylene (LDPE) film has been carried out to optimize adhesive joints with polyolefin foam for uses in technological applications. LDPE films were modified in a continuous way using corona discharge plasma with different powers, ranging from 200 to 600 W and several film advance rates in the 5-20 m min À1 range. Changes in surface wettability have been studied with contact angle measurements and subsequent solid surface energy calculation. A polyurethane adhesive was used to join the LDPE film to a polyethylene foam. Mechanical performance of the adhesive joints has been determined by T-peel tests and also the aging effects of several hydrothermal conditions have been studied to evaluate the usefulness of these laminate composites in technological applications. Results show that corona discharge powers between 400 and 600 W are suitable in terms of wettability improvement; on other hand, a slight decrease in surface wettability as the film advance rate increases is detected but the overall changes as a consequence of the film advance rate in the 5-20 m min À1 range are small if compared to changes derived from working powers in the 200-600 W range. Adhesive joints offer excellent mechanical performance and good durability in hydrothermal conditions thus being appropriate for technical applications.

Improving mechanical performance of thermoplastic adhesion joints by atmospheric plasma

“…The wide availability of commercial grades together with a wide range of mechanical and thermal properties allows polyethylene to fulfill more exigent requirements for other technological sectors [2]. Many of these technical applications require higher surface energy values in order to obtain stable paints, coatings, adhesion joints with other materials, etc.…”

Effect of cold atmospheric plasma treatment on hydrophilic properties of fluorosilicone rubber

“…The so‐called plasma modification refers to the etching, oxidation, and cross‐linking reactions between the material's surface and electrons, positive ions, negative ions, free radicals, atoms, and molecules, those generated from electronic discharge, to change the surface properties . Meanwhile, the treatment has no by‐effect on the physics and mechanical properties of the treated substance . Its modification effect depends on the processing atmosphere, processing time, power, and discharge pressure .…”

Use of atmospheric plasma treatment to improve adhesion properties of sodium ionomer sheets

“…There is a great variety of surface processes with which the adhesive properties of a polymer can be improved without changing the bulk material. They can be grouped into chemical, physical or combined processes [3][4][5].…”

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ElsevierEspaña Giner, J. M.; Boronat, T.; Garcia-Sanoguera, D.; et al (2013). Use of atmospheric plasma treatment to improve adhesion properties of sodium ionomer sheets.

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