Preparation and properties of waterborne polyurethane–urea anionomers—influences of the type of neutralizing agent and chain extender

Waterborne polyurethane–urea anionomers were prepared by polyaddition reaction using isophorone diisocyanate (IPDI), poly(tetramethylene ether) glycol (PTMG, Mn=1000), dimethylolbutanoic acid (DMBA), and hydrazine monohydrate (HD), ethylene diamine (EDA), 1,4-butane diamine (BDA) as a chain extender, followed by neutralization of pendant COOH groups by NH₄OH/Cu(OH)₂ or triethylamine (TEA) as a neutralizing agent. The effects of the types of neutralizing agent such as NH₄OH/Cu(OH)₂ and TEA with various chain extenders on the properties of waterborne polyurethane–urea ionomers were investigated. Two loss modulus peaks for all samples are observed owing to the glass transition temperature of soft segments (Tg _s) and the glass transition temperature of hard segments (Tg _h). The conductivity, Tg _h, ΔTg, and tensile strength/modulus of TEA-based samples increased in the order of BDA>EDA>HD; however, those of NH₄OH/Cu(OH)₂-based samples increased in the order of HD>EDA>BDA. TEA-based film samples were found to have higher thermal stability, Tg _h, ΔTg, tensile strength/modulus, and storage modulus than NH₄OH/Cu(OH)₂-based ones at the same chain extender. On the other hand NH₄OH/Cu(OH)₂-based samples had higher conductivity and stronger antibacterial halo than TEA-based samples.