Preparation and Performance of Sulfonated Poly(aryl ether ketone sulfone)/Poly(aryl ether sulfone oxadiazole) Composite Proton-exchange Membranes†

doi:10.7503/cjcu20130897

Abstract

Abstract:

A serious of sulfonated poly(aryl ether ketone sulfone)/poly(aryl ether sulfone oxadiazole) composite membranes were prepared by solution blended method, to improve the performance of membranes for using in the condition of high-middle temperature(80—120 ℃). These prepared membranes were characte-rized by FTIR spectroscopy and thermo gravimetric analysis(TGA), and exhibited high thermal stability and good chemical stability. The SEM images showed that the composite membranes had compact structure. The composite membranes had low methanol diffusion coefficient properties(3.9×10^-7—6.6×10^-7 cm²/s), which were better than 8.7×10^-7 cm²/s of SPAEKS. Although the composite membranes displayed lower proton conductivities than the pure copolymer membranes at room temperature, the presence of nitrogen heterocyclic led to an improvement in high-temperature conductivity. The proton conductivity of SPAEKS/PAESO was found to be 0.074 S/cm at 100 ℃, which was higher than 0.066 S/cm of SPAEKS.

Key words: Nitrogen heterocyclic, Oxadiazole, Composite membrane, Proton conductivity

CLC Number:

O631

TrendMD:

MA Li, CHENG Hailong, XU Jingmei, WANG Zhe. Preparation and Performance of Sulfonated Poly(aryl ether ketone sulfone)/Poly(aryl ether sulfone oxadiazole) Composite Proton-exchange Membranes^†[J]. Chem. J. Chinese Universities, 2014, 35(3): 639.

Figures/Tables 12

Fig.1 Chemical formula of SPAEKS and BFO

Scheme 1 Synthetic route of PAESO

Scheme 2 Preparation process of SPAEKS/PAESO composite membranes

Fig.2 FTIR spectra of SPAEKS(a), PAESO(b) and S/P-2 composite membranes(c)

Fig.3 TGA curves of membranes a. S/P-0; b. S/P-1; c. S/P-2; d. S/P-3.

Table 1 Analytical data of SPAEKS membrane and S/P composite membranes

Sample	Oxidative stability(%)	10⁷Methanol diffusion coefficient/(cm²·s^-1)	10⁸Water diffusion coefficient at 80 ℃/(cm²·s^-1)	Proton conductivity/(S·cm^-1)
Sample	Oxidative stability(%)	10⁷Methanol diffusion coefficient/(cm²·s^-1)	10⁸Water diffusion coefficient at 80 ℃/(cm²·s^-1)	40 ℃	100 ℃
S/P-0	80	8.7	6.9	0.062	0.066
S/P-1	89	6.6	2.1	0.055	0.070
S/P-2	90	5.3	1.3	0.047	0.072
S/P-3	95	3.9	0.4	0.041	0.074

Fig.4 SEM images of SPAEKS membrane(A) and S/P-2 membrane(B)

Fig.5 Water desorption curves of membranes at 80 ℃ a. S/P-0; b. S/P-1; c. S/P-2; d. S/P-3.

Fig.6 Water uptake of membranes at different temperatures a. S/P-0; b. S/P-1; c. S/P-2; d. S/P-3.

Fig.7 Swelling ratio of membranes at different temperatures a. S/P-0; b. S/P-1; c. S/P-2; d. S/P-3.

Fig.8 Arrhenius plot for proton conductivity

Scheme 3 Proton conductivities principle of composite membranes

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