Graphene/Composites

Students: Emil Bjerglund Pedersen

 

A good dispersion of graphene in coatings can prevent corrosion and water diffusion. Homogeneity of the mixture depends on the type of coating, the type and concentration of graphene, and the method of mixing.
Two different projects explore the above:

 

Project 1:

Evaluate mixing method, type and concentration of graphene. Industrial purpose: Prevent water diffusion.

Methods:

Suggested matrix: Liquid PAI coating, a high-end polymer coating. Depending on the matrix, the mixing method should be chosen. For delicate components only very gentle mixing is possible, for more robust compounds, upside/down mixing could be tried.

The type of graphene is chosen based on mixing different types of graphene (at the same concentration) with the matrix. Optimization of the graphene concentration is investigated for the chosen type of graphene.
The composite is evaluated focusing on mechanisms, electroconductivity, corrosion protection, tightening of the polymer, and coating properties.

Project 2:

Explore how the nature of the coating/composite matrix influence the ability of Graphene exfoliation. Graphene suspension and matrix mix; dried to create powder coating with graphene.

Methods:

Suggested matrix: PFA (Hydrophobic fluoropolymer) and PA (Hydrophilic) as powders (<50µm).
The powder is added to a chose graphene suspension under high shear until a homogeneous pasta is obtained. The solvents are removed and the product is made in to a powder. A film is made from the powder coating and electric conductivity/resistance is measured and used as indication on homogeneity of the composite. The hydrophobic and hydrophilic systems are compared.

Involved partnes: Aarhus University (Mogens Hinge, Steen U. Pedersen), Copenhagen University (Kasper Nørgaard), ECCO, RadiSurf, Vestas, SP Group

Data, progress, and status on the project is found here.

If you’re interested in hearing more about this project, SPOMAN or want to hear about the possibilities for starting a collaboration, please contact us at stinek@inano.au.dk.