Polyethylenimine Guide

Linear polyethyleneimines (PEIs) contain all secondary amines, in contrast to branched PEIs which contain primary, secondary and tertiary amino groups. The linear PEIs are solids at room temperature where branched PEIs are liquids at all molecular weights. Linear polyethyleneimines are soluble in hot water, at low pH, in methanol, ethanol, or chloroform. It is insoluble in cold water, benzene, ethyl ether, and acetone. One end of the polymer chain is a methyl group, the other end is a hydroxyl group. It has a melting point of 73-75°C. It can be stored at room temperature....