Acetone acs grade

Branched poly(ethylenimine) (PEI; MW ∼25,000), acetone (ACS grade), ethyl acetate (>99.5%), dimethylsulfoxide (DMSO, 98%), and azobisisobutyronitrile (AIBN, 98%, recrystallized from methanol) were purchased from Sigma Aldrich (Milwaukee, WI). D-Glucamine (>95.0%) was purchased from TCI Chemicals (Philadelphia, PA). Methanol (MeOH; ACS grade) was purchased from Avantor Performance Materials (Center Valley, PA). Ethanol (EtOH, 200 proof) was obtained from Decon Labs (King of Prussia, PA). 2-Vinyl-4,4-dimethylazlactone (VDMA), a kind gift from Dr. Steven M. Heilmann (3M Corporation, Minneapolis, MN), was fractionally distilled under vacuum (B.P. ∼22 °C at ∼500 mTorr; clear mobile liquid at room temperature) and then stored with 500 ppm butylated hydroxytoluene (BHT) and 1000 ppm triethylamine at 0 °C prior to use. Poly(2-vinyl-4,4-dimethylazlactone) (PVDMA) was synthesized by free radical polymerization at 60 °C for 24 hours in ethyl acetate (solvent:monomer ratio 3 mL:1 g) initiated by 1.0 mol% AIBN, as described previously.^{21 (link)} A roll of PET film (thickness = 0.004 inches) was purchased from McMaster Carr (Elmhurst, IL). Water with a resistivity of 18.2 MΩ was obtained from a Millipore filtration system. Compressed air used in drying steps was filtered through a 0.2 μm membrane syringe filter. Chemicals were used without further purification unless otherwise noted above.