Polyurethanes with pedant quaternary ammonium salts (QAS) have been shown potent antimicrobial properties against gram positive bacteria but less sensitive to gram negative ones. Besides, due to using a large amount of QAS chain extenders, Polyurethanes with pedant QAS have been proven to be high water adsorption and even water soluble. In order to solve the two problems mentioned above of biocidal polyurethane with QAS groups, Polyurethanes were synthesized from the chain extender with pendant bis ammonium salts and verified by GPC and 1HNMR. The degree of microphase separation of sythesized polyurethans was characterized by FTIR and DSC. It was found that the phase separation of the two sets of the polyurethanes decreased with increasing the amounts of bis-ammonium salts chain extenders as proven by DSC and FTIR.
