Adhesive Coatings

Keywords: adhesives, thermosealing, thermoforming, LDPE, PET.

Description

In this project an atmospheric pressure plasma jet system known as PlasmaStreamTM is used to deposit functional coatings on steel. The atmospheric pressure RF (17- 19 kHz) discharge is formed between two bare metallic electrodes. Liquid precursors are fed as droplets into the plasma using a pneumatic nebulizer. The jet is moved over the substrates using a computer numerical control (CNC) system. Amongst the precursors for the adhesive coatings (plasma polymerised primer) is a combination of tetraethyl orthosilicate (TEOS) and polyhydrogenmethyl siloxane.

These liquid precursors are nebulised into a helium / oxygen plasma. The adhesion ‌ of   siloxane elastomer to the coated and uncoated steel is determined using 45° peel strength measurements. Through the application of the nm thick coating, up to a 15 fold increase in adhesive fracture energy was obtained.

An alternative application of atmospheric plasmas in absence of a deposited coating is to increase the surface energy of  polymers. Arising from this increase significantly improved polymer to polymer adhesion can be obtained (Poster attached). 

15-fold increase in adhesion between stainless steel and siloxane elastomer achieved with plasma polymerised primer (PPP).

Posters and Publications

Adhesive Coatings

Contact details

Prof. Denis Dowling
Director UCD Surface Engineering
Email: denis.dowling@ucd.ie

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