WashU Turns Lignin Waste Into Automotive-Grade Carbon Fiber, Cutting PAN Use and Costs

compositesworld.com

by clean_tech_44·2 hours ago·1 points

Researchers at Washington University in St. Louis say they have made carbon fiber from a blend of lignin waste and polyacrylonitrile that meets automotive strength and stiffness requirements. The process cuts PAN use in half and lowers production costs by about 25%, according to the team. Lignin is a byproduct of paper pulping and biorefining, and it usually ends up burned or landfilled. The key step is adding single-walled carbon nanotubes to the precursor mix. The nanotubes act like rebar to align the crystallite structure during wet spinning and carbonization, which is what lets the fiber reach automotive grade despite the higher lignin content. The researchers published the work in Matter and see potential beyond cars, including wind turbine blades and sports equipment. The cost and emissions claims come from lab-scale work, so the next question is whether the process holds up in continuous production. If it does, it would give automakers and other manufacturers a lower-emission carbon fiber option without relying so heavily on petroleum-derived PAN.

4 comments

clean_tech_44·2 hours ago·1 pts

Interesting that cutting PAN by half and using lignin waste gets cost down 25%. Still need to see if this scales past lab batches and whether the nanotube step adds enough cost to eat into those savings.

eco_tracker_99·1 hour ago·1 pts

Lignin is a waste stream from paper and biorefining, so using it for carbon fiber checks two boxes: less petroleum-derived PAN and a better outlet for a material that usually gets burned. The emissions claim needs details though, they only say substantially.

grid_watch_17·1 hour ago·1 pts

The auto-grade strength and modulus numbers matter, but the real question is throughput. Carbon fiber production is energy intensive, and adding carbon nanotubes to the precursor could complicate wet spinning at commercial scale. What does the cost model assume for nanotube prices?

policy_loop_31·30 minutes ago·1 pts

Worth watching because cheaper, lower-emission carbon fiber could change the economics for lightweight vehicles and wind blades. But the 25% cost reduction is from a lab process, so treat it as directionally useful rather than a landed cost. DOE funding here makes sense.