R&D project promises innovative composite solution

AIM Altitude has been working with Composites Evolution and Sheffield Hallam University on an R&D project backed by Innovate UK.

The collaboration’s objective has been to develop a nanocomposite material with exceptional fire and mechanical performance, suitable for use in aircraft interior applications.

The team has developed a thermosetting resin system, which is a blend of poly(furfuryl alcohol) (PFA) with a specific additive mix, for the production of glass fibre pre-pregs using a hot-melt process.

The successful conclusion of the project in August 2020 is expected to bring to market a new family of materials with improved performance, enabling greater design freedom, including new decorative finishes, and a safer passenger environment.

Vernon Thomas, engineering manager at AIM Composites, said: “Materials and design options for composites in fire-critical applications are currently very limited. The nanocomposites we have developed have led to enhanced performance all round. It is a better, safer product, which is bio-based and renewable. The fire, smoke and toxicity (FST) performance is better than phenolics.

“The reduced porosity has great advantages for the finish, reducing costs considerably, and peel strength improvement gives vital increases to integrity and durability. All of which offers airlines greater opportunities for differentiation.”

The PFA resin base is produced from biomass waste, which has a mature, secure, low-cost supply, and does not compete with food production so is completely sustainable. The composite is similar to phenolic, but without the toxic phenol and formaldehyde compounds, making it safer across the whole product lifecycle.

Dr Brendon Weager, technical director of Composites Evolution, said: “Working with Sheffield Hallam University and AIM Altitude has given us the opportunity to fully explore our new product ideas. The nanocomposite solution we have developed has so many improved features it will redefine composites capabilities.”

The resulting cured pre-pregs have been tested at AIM Altitude’s facilities in Cambridgeshire and have shown substantially better fire properties than current phenolic pre-pregs. The surface finish is also superior, which in itself will substantially reduce downstream costs in defect rectification and preparation for decoration. The enhanced fire properties will permit the use of some decorative finishes not currently available for commercial aircraft interiors.

www.aimaltitude.com

www.compositesevolution.com