Abstract
Generally, polymeric materials present an issue related to their low surface energy: low painting ability. The main aim of this work is to improve the adhesion between polymeric surfaces (polydimethylsiloxane (PDMS), and acrylonitrile-butadiene-styrene (ABS)) and paints (epoxy (EP), and polyurethane (PU)-based). In order to increase adhesion, hydrophilic modification of surfaces by atmospheric pressure plasma torch treatment (APPT) was proposed. Furthermore, it can permit dissimilar joints, i.e., ABS with a metal joined by a silicone (based PDMS), to be painted. The surface modifications were characterized by measurements of surface energy and roughness. In addition, the effectiveness of the pre-treatment on improving paint adhesion was confirmed by scratch, cross-cut, and adhesion tests. Results showed the possibility of coating both ABS and PDMS with a PU-based paint when treated with plasma. As a novel result, polymer and metal panels joined by silicone were able to be painted with the PU paint.
Highlights
Acrylonitrile-butadiene-styrene (ABS) and polydimethylsiloxane (PDMS) polymers are widely used, as they offer excellent intrinsic properties such as lightweight, high strength or chemical resistance, among others
PDMS was first used in biomedical and organic applications [1], and it protects against corrosion as a coating for metal substrates [2] and it is extensively used on the manufacturing of lab-on-a-chip devices [3]
It can work under higher temperatures than other organic adhesives and presents good electrical insulation and excellent chemical properties combined with high visco-elastic properties [5]
Summary
Acrylonitrile-butadiene-styrene (ABS) and polydimethylsiloxane (PDMS) polymers are widely used, as they offer excellent intrinsic properties such as lightweight, high strength or chemical resistance, among others. PDMS was first used in biomedical and organic applications [1], and it protects against corrosion as a coating for metal substrates [2] and it is extensively used on the manufacturing of lab-on-a-chip devices [3]. PDMS is mainly used as an adhesive, because its inorganic backbone provides unique properties. It can work under higher temperatures than other organic adhesives and presents good electrical insulation and excellent chemical properties combined with high visco-elastic properties [5]. The use of PDMS and ABS in other products or applications is often limited, as they cannot be strongly bonded to other materials, due to their low surface energy, especially for PDMS
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