Abstract
The development of bonding technology and coating technologies require the use of modern materials and topologies for the demanding effect and modification of their wetting properties. For the industry, a process modification process that can be integrated into a process is the atmospheric pressure of air operation plasma surface treatment. This can be classified and evaluated based on the wettability, which has a significant impact on the adhesive force. The aim is to improve the wetting properties and to find the relationship between plasma treatment parameters, wetting, and adhesion. High Impact PolyStyrene (HIPS) was used as an experimental material, and then the plasma treatment can be treated with various adjustable parameters. The effect of plasma parameters on surface roughness, wetting contact angle, and using Fowkes theory of the surface energy have been investigated. Seven different plasma jet treatment distances were tested, combined with 5 scan speeds. Samples with the best plasma parameters were prepared from 25 mm × 25 mm overlapping adhesive joints using acrylic/cyanoacrylate. The possibility of creating a completely hydrophilic surface was achieved, where the untreated wetting edge angle decreased from 88.2° to 0° for distilled water and from 62.7° to 0° in the case of ethylene glycol. The bonding strength of High Impact PolyStyrene was increased by plasma treatment by 297%.
Highlights
Pure polystyrene is an amorphous, transparent material with a softening point of about 100 ◦ C, it is brittle at room temperature, micro-cracks could appear in a short time due to internal stress, and it dissolves well in most organic solvents
The plasma surface treatment reduced the surface roughness values overall compared to the untreated High Impact PolyStyrene (HIPS) specimen
As a summary of the results using HIPS polymer obtained during the research:
Summary
Different industries have developed very rapidly in the past decades, where it is important that the surface of the materials used have surface characteristics like coatings, adhesive technologies, painting applications, soldering, and brazing [1,2]. Examples of such properties include hardness, corrosion resistance, and wear resistance [3]. A good wetting property means that a liquid can spread fully on the surface [10,11,12]. An example of the need for a good wetting property is for the adhesion bonding techniques [13,14]. If the wetting behaviour of the surface is bad, it will result in a poor bonding strength and poor joining quality [15]
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