Recycling Technologies for Fiber-Reinforced Composites
Summary
In recent decades, fibre-reinforced composites combining glass or carbon fibres with polymer matrices have emerged as vital materials across aerospace, automotive, wind energy and sporting industries. Their exceptional strength-to-weight ratios and design flexibility underpin lighter, more efficient structures, but their complex heterogenous makeup poses significant end-of-life challenges. Traditional landfill disposal is no longer tenable under tightening environmental regulations and cost pressures, prompting the development of diverse recycling methods. Mechanical recycling techniques, including milling and grinding, provide low-cost, low-energy means to produce short-fibre recyclate suitable for non-critical components, albeit with diminished performance compared to virgin fibres. Thermal processes such as pyrolysis and fluidised-bed decomposition achieve selective matrix removal and recovery of larger fibre bundles, balancing energy demand with retention of mechanical properties. Chemical routes, notably solvolysis, leverage tailored solvents and catalytic environments to depolymerise thermoset networks, yielding high-quality fibres for reintegration into new composites. Parallel advances in recyclable thermoplastics and dynamic covalent chemistries suggest the realisation of multi-loop material reuse. Underpinned by life-cycle assessments and techno-economic evaluations, modular recycling frameworks are being piloted worldwide. Emerging priorities include hybrid process integration, digital material passports and policy incentives to foster a circular economy for composite materials, ensuring resource security and environmental stewardship on a global scale.
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Recycling Technologies for Fiber-Reinforced Composites publication trend
The graph below shows the total number of articles in recycling technologies for fiber-reinforced composites across all publications each year (not limited to Nature Index journals).
Technical terms
Fibre-reinforced composite: A material system combining high-strength fibres within a polymer matrix to achieve superior mechanical properties.
Thermoset: A polymer that cures irreversibly into a rigid network, typically resistant to remelting and requiring specialised recycling techniques.
Thermoplastic: A polymer that softens when heated and solidifies upon cooling, allowing repeated reshaping and facilitating mechanical recycling.
Pyrolysis: A thermal decomposition process conducted in an inert atmosphere to break down polymer matrices and recover intact fibres.
Solvolysis: A chemical recycling approach that employs solvents under controlled conditions to dissolve polymer networks and liberate reinforcement fibres.
References
- A review on the recycling of waste carbon fibre/glass fibre-reinforced composites: fibre recovery, properties and life-cycle analysis. Discover Applied Sciences (2020).
- Recent progress in recycling carbon fibre reinforced composites and dry carbon fibre wastes. Resources Conservation and Recycling (2021).
- Technology readiness level assessment of composites recycling technologies. Journal of Cleaner Production (2016).
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