Water uptake in the system M(CF3SO3)2PEO,, where M=Ni, Zn and Pb, and n=6-24, has been investigated at room temperature using i.r. spectroscopy and X-ray diffraction. It has been found that the ion-pairing/clustering involving M 2 + and CF3SO 3 is highly affected by hydration, with water replacing CF3SO 3 at the cation. At intermediate degrees of hydration, the CF3SO 3 ions are hydrogen bonded to metal-ion coordinating water molecules. In conditions of water excess, features typical of CF3SO 3 ions in aqueous solution are observed. The interaction between PEO and M 2 + is also affected by hydration for M = Ni and Zn. The v(COC)a stretching band is shifted to higher wave numbers, indicating a weakening in the interaction between PEO and a hydrated cation. X-ray diffraction has shown that any crystalline component present in the anhydrous form is destroyed by water uptake.
Посилання на статтю:
Infra-red and X-ray diffraction study of the hydration process in the polymer electrolyte system M(CF3SO3)2PEOn for M-Pb, Zn and Ni / Asa Wendsjo, John O. Thomas and Jan Lindgren // Polymer. – 1993. – Vol 34. – P. 2243-2249.