A. Bratov et al., PHOTOCURABLE POLYMER MATRICES FOR POTASSIUM-SENSITIVE ION-SELECTIVE ELECTRODE MEMBRANES, Analytical chemistry, 67(19), 1995, pp. 3589-3595
Photocurable oligomers based on methane and Bisphenol A (epoxy) diacry
lates have been studied as an alternative polymer matrix for ion-selec
tive membranes of ion sensors, The compatibility of the polymers with
various plasticizers commonly used in PVC-based ion-selective membrane
formulations has been tested, and it has been shown that the methane-
based membranes may hold more than 50% of a plasticizer, while epoxy-b
ased compositions are not fully compatible with them, Potassium-sensit
ive electrodes with an inner reference solution and a membrane formed
by photocured methane containing valinomycin as the ionophore have bee
n investigated. The influence of the amount and the type of photoiniti
ator, cross-linking agent, and plasticizer on ion response of the ion-
selective electrode has been studied. ion-selective electrodes with an
optimized membrane composition show a sensitivity of 57 mV/decade, a
range of linear response from 1 to 10(-5) mol/L of KCl, and a limit of
detection around 10(-6) mol/L. The developed polymer matrix was used
to make an ISFET-based potassium sensor.