SOLID-STATE NMR-STUDIES OF SODIUM-IONS IN A POLYBUTADIENE MATRIX

Sodium ions were implanted into polybutadiene by cathodic polarization of polybutadiene-coated copper in 0.5M aqueous solutions of NaCL, NaBr, and NaI. The chemical environment of the implanted sodium was studied utilizing solid-state NMR techniques. The sodium ions were present in two types of environments when exposed to water. The majority was present as hydrated ions within the polymer and was represented by a sharp component of the 23Na NMR spectrum. A smaller quantity was present as a constrained species represented by a broad component of the 23Na NMR spectrum. When the polymer film was dried over a desiccant, the sodium ions associated with carboxyl groups present in the matrix. © 1990, The Electrochemical Society, Inc. All rights reserved.