کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5184599 | 1381052 | 2010 | 10 صفحه PDF | دانلود رایگان |
Novel cardo poly(aryl ether sulfone)s containing pendent -[CH2CH2NMe3]+OHâ, or -[CH2CH2CH2NMe3]+OHâ groups, and partially fluorinated cardo poly(aryl ether sulfone) containing pendent -[CH2CH2CH2NMe3]+OHâ groups were synthesized and examined with the focus of understanding how the polymer chemical structure affects their morphology, ion conductivity and alkaline stability. The resulting quaternized polymers exhibited outstanding solubility in polar aprotic solvents. The partially fluorinated cardo poly(aryl ether sulfone)s (PES-PF-OH) with ion-exchange capacity of 1.44 meq gâ1 displayed the highest ion conductivities, varied from 3.0 Ã 10â2 to 4.1 Ã 10â2 S cmâ1 over the range 20-60 °C. TEM revealed that PES-PF-OH membrane exhibited a distinct phase-separated morphology comprised of interconnected ionic clusters in size of 1-2 nm. The studies on alkaline stability of the membranes revealed that the PES-PF-OH polymer was not stable under strong basic conditions. The quarternized polymers containing pendent -[CH2CH2NMe3]+OHâ, or -[CH2CH2CH2NMe3]+OHâ groups mainly underwent Hofmann elimination and SN2 substitution reaction.
Journal: Polymer - Volume 51, Issue 23, 29 October 2010, Pages 5407-5416