Ionic association in complexes of lithium trifluoromethanesulfonate with low-molecular-weight poly(ethylene oxide) dimethyl ethers was studied using Raman and infra-red vibrational spectroscopy. The relative concentrations of ion pairs and more highly associated ionic species are quite dependent on chain length. This dependence was measured in both the CF 3 symmetric deformation mode and the SO3 symmetric stretching mode. The effect of the terminating group was considered by comparing the dimethyl ethers with hydroxy-terminated poly(ethylene oxide) at comparable chain lengths. Hydrogen bonding effects in the hydroxy-terminated poly(ethylene oxide) compounds were also found to depend on chain length.
Посилання на статтю:
Dependence of ionic association on polymer chain length in poly(ethylene oxide)-Iithium triflate complexes / Weiwei Huang and Roger Frech // Polymer. – 1994. – Vol 35. – P. 235-242.