What is Polyacrylonitrile?

Polyacrylonitrile is a synthetic polymer built by chain-polymerizing acrylonitrile monomer, and the resulting backbone is studded with nitrile (C≡N) side groups whose sharp polarity is what keeps the polymer from dissolving in ordinary solvents and gives it its notable resistance to chemical attack. Converting PAN fiber into carbon fiber takes it through three sequential heating stages — first stabilizing the fiber, then carbonizing it, then graphitizing it — and each stage drives off non-carbon atoms while locking the remaining carbon into an increasingly ordered, graphite-like lattice that is both heat-stable and mechanically strong. That conversion pathway is the reason PAN dominates commercial carbon fiber manufacturing today. Sarchem Labs supplies this grade at an average molecular weight of 50,000, giving formulators a defined starting point for processes where molecular weight affects solution viscosity, spinnability, or downstream conversion behavior.

Uses of Polyacrylonitrile

PAN’s best-known use is as the precursor polymer for carbon fiber, spun into filament and then converted through controlled heat treatment into a high-strength, lightweight carbon material used across aerospace, automotive, and sporting-goods industries. Beyond carbon fiber, PAN is cast into membranes for water treatment and food/beverage filtration, spun into fire- and chemical-resistant technical textiles, and used as a binder in battery electrode formulations.

In more specialized research settings, PAN also serves as a precursor for electrospun activated-carbon materials with fine meso- and macro-scale porosity, materials studied for hydrogen storage, electromagnetic interference (EMI) shielding, electrochemistry, and separation science, and as a component in PAN-based single-walled carbon nanotube composites.