Highly branched poly(2-hydroxypropylene imines) (PHPI) were synthesized by polycondensation of 1,3-diamino-2-propanol and 1,3-dibromo-2-propanol in several polar protic and aprotic solvents.
 Kinetics of polycondensation was studied using solution calorimetry and conductometric titration, and PHPI were characterized by SEC, ¹H and ¹³C NMR spectroscopy, and DSC. PHPI with the highest degree of branching were synthesized in DMF, while those with the lowest degree in methanol. Independent of the degree of branching, PHPI were not crosslinked and well soluble in aqueous solutions. Presumptive mechanism of branching during polycondensation of aliphatic diamines and dibromides in polar protic and aprotic solvents is presented.

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