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

摘要

Waterborne polyurethaneurea 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 NH_4OH/Cu(OH)_2 or triethylamine (TEA) as a neutralizing agent.The effects of the types of neutralizing agent such as NH_4OH/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,DELTATg,and tensile strength/modulus of TEA-based samples increased in the order of BDA>EDA>HD;however,those of NH_4OH/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,DELTATg,tensile strength/modulus,and storage modulus than NH_4OH/Cu(OH)_2-based ones at the same chain extender.On the other hand NH_4OH/Cu(OH)_2-based samples had higher conductivity and stronger antibacterial halo than TEA-based samples.