期刊
JOURNAL OF MEMBRANE SCIENCE
卷 431, 期 -, 页码 105-112出版社
ELSEVIER
DOI: 10.1016/j.memsci.2012.12.024
关键词
Ion exchangers; Polyelectrolytes; Thermal properties
This paper focuses on the differences between the thermal behaviour of cation exchanged membrane based on Short Side Chain (SSC) and Long Side Chain (LSC) polymers. The a relaxation of alkali and Cu2+ exchanged membranes showed dependency on ion exchange capacity and the length of the side chain similar to that of H+-form membranes. The modulus drop of multivalent contaminated membranes was attributed to a degradation process except for Ba(2+)and Zn2+ LSC exchanged membrane. The thermal behaviour as function of the Lewis Acid Strength, LAS, of the cation could originate from infrared (IR) vibrational changes. For cations with LAS<0.3, the 1060 cm(-1) and 970 cm(-1) mode induce concurrent shift towards high wavenumbers. This suggests a stiffening of the corresponding bonds resulting in the improvement of the membrane's thermal stability. The cations with LAS>0.3 decrease the 970 cm(-1) wavenumber which could explain the enhancement of the degradation.
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