resins from polystyrenes and related materials. 5 We reasoned that fuming sulfuric acid would be capable of aromatic sulfonylation with printed ABS materials, as the phenyl groups of the Figure . Idealized section of ABS polymer and its potential chemistry. styrene monomers are excellent substrates for SEAr reactions (Figure ). Moreover, the sites of unsaturation from the butadiene monomer could provide a means of annealing, or crosslinking, the ABS chains of the printed surface. Presumably, the unsaturated sites would be protonated by the fuming sulfuric acid -allowing the resulting carbocations to react with interior styryl groups or other unsaturated sites.