Researchers at the University of Oulu in Finland have developed high-performance bio-based epoxy and polyester resins that can replace fossil-based resins in composite materials. The new materials deliver strong mechanical performance, competitive pricing and industrial scalability.
Composites play an essential role in construction, renewable energy, transport and marine design. This innovation offers architects, product designers and automotive designers a more sustainable alternative without compromising technical requirements.
The research team produces the resins from biomass-derived platform chemicals, including hydroxymethylfurfural (HMF) and furfural. These substances come from lignocellulosic biomass found in forestry and agricultural side streams such as sawdust and straw.
Instead of burning or discarding this biomass, the process upgrades it into valuable chemical building blocks. This approach strengthens circular bioeconomy value chains and reduces reliance on fossil resources.
Polyester resins are widely used in fibreglass composites for boats, caravans and lightweight panels. Epoxy resins are essential in structural adhesives, sports equipment and high-performance components. Many of these applications are relevant for architecture, mobility and industrial product design.
The team tested the materials under demanding conditions. The biomass-based polyester resin showed up to 76% higher tensile strength than a commercial fossil-based polyester resin.
The researchers designed the new resins to run on existing chemical production lines. Manufacturers can therefore integrate them into current systems without major infrastructure changes. This compatibility supports faster market adoption.
The most significant advantage lies in the resins’ chemical recyclability. Conventional thermoset composites are difficult to recycle. Wind turbine blades, for example, often end up as waste at the end of their service life.
The new biobased resins can be chemically broken down and reused as raw materials. This process enables closed-loop composite systems and supports circular design strategies.
For architects specifying façade panels or structural elements, recyclability adds long-term value. Automotive, marine and product designers can also reduce end-of-life impact while maintaining lightweight performance.
Less than two percent of global oil reserves lie within the EU. Biobased materials therefore strengthen European material independence. By combining forest resources with advanced chemistry, the project supports climate goals and strategic autonomy.
The team has filed three patents and is now seeking partners for pilot-scale production.
As demand for sustainable composite materials grows, forest-based resins may become a viable circular alternative to fossil-derived polymers.
Source: University of Oulu via EurekAlert!
Photo: Juha Heiskanen / University of Oulu