Fiber-reinforced composite laminates often suffer from cracks in the matrix, affecting mechanical strength and durability, which are especially critical in aeronautical, automotive and gas and liquid storage applications. The proposed solution uses a new type of resins, vitrimeric resins, to generate pre-compressive stresses in the material and improve the shear strength and durability of the materials, without increasing the weight and/or the section size.
This technology introduces a novel method for manufacturing composite laminates using vitrimeric resins, taking advantage of their ability to undergo reversible bond‑exchange reactions when heated. This dynamic behavior enables controlled stress relaxation within the matrix, which is key to generating stable compressive stresses during processing. The laminate is mechanically loaded while the vitrimer is selectively heated, allowing the matrix to relax while the fibers remain elastically stretched. After cooling, releasing the load causes the fibers to contract, locking beneficial precompression into the matrix. This internal stress state enhances resistance to crack initiation and propagation and can be applied in multiple directions. In addition to improved mechanical performance, the technique helps mitigate manufacturing defects such as fiber waviness and residual stresses, offering a lightweight, scalable solution compatible with existing composite‑production routes.
Competitive advantages
Objective market
Potential applications
Intellectual property status
Granted Patent
Patent number : EP24382828
Where : Europe
Current development status
Working prototypes
Desired business relationship
Technology development
Adaptation of technology to other markets
Other : Pilot testing
The University of Girona (UdG) by means of its Research & Technology Transfer Office (TTO) provides services to 117 research groups, 42 of which have been recognized as Consolidated Research Group of Catalonia and 4 among them have been incorporated into the TECNIO network, the top Catalonia's Government excellence research network.
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