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E. EFTIMIE TOTU1,* , E. RUSE1, I. DIACONU1, R. GÎRDEA1
The work presented in this paper was realized using the polyimide obtained through the polycondensation of the pyromellitic dianhydride with 4, 4′ - diaminophenyl ether. Polyimide based polymeric membranes were characterized as regards the a.c. impedance and electrochemical analyses. The experiments put in evidence the influence of the membrane composition on the electrochemical answer of the sensor. Also, it was put in evidence the action of the electrolyte solutions upon the selective membranes. Through impedance analysis it was possible to show that the water from the aqueous electrolyte solution acts not only as a plasticizer for the polymeric matrix, but it also exists as absorbed water on the membrane surface. Meanwhile, it was concluded that the addition of the lipophilic agent in the selective membrane composition results in membranes with higher dielectric constant. The dielectric constant of the polymeric matrix of the ionselective devices based on neutral carriers has an important influence on selectivity.
Polyimide polymeric matrix, Plasticizer, Plasticizing effect of electrolyte, a.c. Impedance analysis, Lipophilic additive.
E. EFTIMIE TOTU, E. RUSE, I. DIACONU, R. GÎRDEA, On the behaviour of polyimide ion-selective membranes in electrolyte solutions, Optoelectronics and Advanced Materials - Rapid Communications, 3, 12, December 2009, pp.1327-1330 (2009).
Submitted at: Nov. 12, 2009
Accepted at: Nov. 23, 2009
Optoelectronics and Advanced Materials - Rapid Communications
(2022): 0.5 - 2022 Journal Citation Reports (Clarivate Analytics, 2023)
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