Scalable process of reclaiming nearly 100% of carbon fiber in certain composites


Georgia Tech researchers have created a scalable process of reclaiming nearly 100% of the carbon fiber in certain composites — which could cut the cost and grow the appeal of automotive carbon fiber. The Georgia Tech procedure works on the subset of carbon-fiber suspended in vitrimer epoxy. It dissolves the epoxy by soaking it in an alcohol solvent. Carbon fiber-reinforced polymer, like many automotive composites, features reinforcing structures within a hardening resin matrix. It’s the same principal as rebar in concrete. “Once dissolved, the carbon fibers and the epoxy can be separated and used in new applications.

“This method we think could have a lot of immediate industrial applications, with lots economical and environment benefits,” former Georgia Tech postdoctoral researcher Kai Yu, now a professor at the University of Colorado-Denver, said to the magazine about his research, published earlier in July by Advanced Functional Materials. “It’s very easy to operate, so there’s no limit to the size,” he said. “It can be easily scaled up. It's unclear what proportion of automotive carbon fiber — if any — uses vitrimer epoxy, which is different from what the piece calls “traditional carbon fiber.”

The polymer matrix (in traditional CFRP) is usually crosslinked, just like the rubber, and it can’t be simply melted; it’s very hard to strip away the polymer to reclaim the embedded carbon fibers, which are more valuable to recycle,” Georgia Tech professor Jerry Qi told Research Horizons. “Vitrimers contain dynamic bonds that can alternate their structure without losing network integrity under certain conditions,” he said. “We let alcohol, which has small molecules, to participate in the network of alternating reactions, which effectively dissolved the vitrimer.”

The study was sponsored by not only the National Science Foundation, but also the Chinese National Natural Science Foundation and the Digital Manufacturing and Design Centre and A*Star Public Sector Fund in Singapore.

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