Title: Vitrimer Matrix Composite Pressure Vessels with Recyclability

Authors: Alison Kennedy, Carineh Ghafafian, Steve Nutt

DOI:

Abstract: As renewable fuels replace traditional ones, composite over-wrapped pressure vessels (COPVs) are expected to increase in number and applications. There is currently no large-scale recycling process for these tanks, despite the fact that they contain long carbon fiber tows that are not cut during the manufacturing process, unlike most composite parts. To address the environmental concerns of increased use of COPVs, we have developed representative lab-scale tubular specimens to demonstrate unwinding and remanufacturing recovered carbon fibers. A vitrimer towpreg was selected and successfully used for filament winding of tubular specimens. Samples were tested under short-beam strength (SBS) loading and compared to control specimens in accordance with current industry standards. The vitrimer coupons had comparable SBS strengths, indicating that a vitrimer matrix COPV could be a feasible option. Additionally, vitrimer tubes were dissolved and unwound for subsequent remanufacturing. The remanufactured specimens had comparable strength to the virgin material. A challenge of unwinding carbon fibers is ensuring adequate tension in the fibers to maintain tow geometry and to reduce tangles and knots. To address these challenges, a modular system has been developed to control the carbon fibers during the unwinding process. This system will enable the fibers to undergo a reverse filament winding process, passing through necessary cleaning baths, and streamline the process.

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Conference: SAMPE 2026

Publication Date: 2026/04/27

SKU: 7

Pages: 8

Price: $16.00