Adhesion of PMMA and acrylates on Metal surfaces

Poly(methyl methacrylate) (PMMA), a transparent thermoplastic material also marketed simply as acrylic, acrylic glass or under trade names such as plexiglass, acrylite, lucite and perspex. The processing of PMMA is possible using most traditional techniques such as injection molding, compression molding, and extrusion. Also casting using resins of PMMA and catalysts is possible. PMMA is generally considered “sticky” however it generally doesn’t bind to metals and other hard surfaces. Read more about PMMA here.

 

Adhesion of PMMA on Stainless Steel

As mentioned above, PMMA is generally sticky but it does not bind directly to metal surfaces such as stainless steel. With the RadiSurf™ PMMA Adhesion system, we provide a surface coating for metal surfaces, that allows for an extremely strong chemical bonding between the thermoplastic and the metal. The adhesion layer is between 20 and 60 nm in thickness and allows for solvent welding, injection molding, compression molding and extrusion on the metal surfaces. It is generally recommended to post-process the samples with annealing.

Assembly using solvent welding

Adhesion of PMMA to stainless steel (316). The elements shown are assembled using solvent welding. The assembly of the RadiSurf™ coated metal surfaces with PMMA is easily done using solvent welding. The most effective solvent for the assembly is dichloromethane. In the video below we show how easily stainless steel samples and PMMA sheets are assembled using solvent welding. After only 10 seconds, the samples are cured enough to handle and after ~60 minutes full strength of the interface is obtained. The strength of the interfaces is in general defined by the strength of the PMMA blend used, as a cohesive fracture is usually observed in breakage.

 

Over molding of PMMA on metal surfaces

Metal surfaces, such as aluminum, stainless steel or titanium, coated with the RadiSurf™ PMMA Adhesion system can be used in over-molding procedures. Adhesion is obtained directly from the molding process, although an annealing step is recommended to minimize stress in the samples after molding. In over-molding experiments, we have seen that it is the PMMA that fails not the interface where the adhesion is made, meaning that the limit of strength is in the material used not the RadiSurf™ PMMA Adhesion system.

 

Adhesion of PMMA on titanium and other metals for biomedical applications

Our adhesion solution for PMMA is a 20-60 nm thin layer of polymer brushes that is chemically stable, safe and clean. Hence, our solution is especially suitable for medical applications, food contact systems etc. where traditional adhesives may be problematic. With such a thin adhesion layer a uniquely tight interface between the metal and thermoplastic material is obtained, which is beneficial in ensuring that no contaminations can enter the interface between the materials. Our adhesion solution may be ideal for implants, dental applications etc.

Adhesion of PMMA in design applications

With an extremely tight and transparent interface between the acrylic glass and the steel, you obtain unique design possibilities. You can even obtain high levels of adhesion on smoothly polished metal surfaces.

Stability of adhesion layer

The RadiSurf™ PMMA Adhesion system is stable for normal storage conditions and stable metal surface coated with the system can be stored for 2-3 months prior to use without any effect on the strength of the final adhesion. 

Scientific literature

Improved Adhesion Between PMMA and Stainless Steel Modified with PMMA Brushes

Kyoko Shimizu, Kristoffer Malmos, Allan Hjarbæk Holm, Steen Uttrup Pedersen, Kim Daasbjerg, and Mogens Hinge
ACS Applied Materials & Interfaces 2014 6 (23), 21308-21315

DOI: 10.1021/am5062823

RadiSurf
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Email: info@radisurf.com
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