Potentiometric Properties of Ion-Selective Electrode Membranes Based on Segmented Polyether Urethane Matrices

摘要

Potentiometric responses of polyurethane (PU)-based membranes containing valinomycin and varying amounts of plasticizer (DOA) and/or lipophilic additive(KTpClPB) were examined as a function of soft segment［poly- (tetramethylene ether glycol)］contents in aromatic diiso- cyanate-based PU matrices. Upon increasing the weight percentages(W_soft) of soft segments, which in part behave like a built-in plasticizer, providing the matrices with rubbery structure (glass transition temperature below -58deg), the amounts of DOA and /or KTpClPB necessary to result in near-Nerntian response(e.g., slope＞50mV/ decade) to potassium were substantially lowered.