Preparation of Cross-linked Poly(aryl ether sulfone) Containing Pendant Quaternary Ammonium Groups for Anion Exchange Membrane†

doi:10.7503/cjcu20150983

Abstract

Abstract:

Cross-linked anion exchange membranes(AEMs) for poly(aryl ether sulfone) bearing pendant quaternary ammonium groups were prepared by a simplified and environmental-friendly approach, which possess low swelling radio and high ion exchange capacity(IEC). The membrane test showed that the water uptake and swelling ratio reduce with increase of cross-linking degree. At 20 ℃, the cross-linking membranes show the ion conductivity above 0.045 S/cm and the tensile strength above 50.1 MPa, which indicates that the cross-linked film still keep good mechanical properties and higher ionic transmission ability under high IEC. Meanwhile, when the cross-linking degree increasing, the methanol barrier property of the membranes will enhance.

Key words: Anion exchange membrane, Fuel cell, Poly(aryl ether sulfone), Cross-linking

CLC Number:

TrendMD:

WANG Limei, DOU Liyan, XIN Peng. Preparation of Cross-linked Poly(aryl ether sulfone) Containing Pendant Quaternary Ammonium Groups for Anion Exchange Membrane^†[J]. Chem. J. Chinese Universities, 2016, 37(7): 1408.

Figures/Tables 10

Scheme 1 Synthetic routes of L-PAES-x(x=70, 80, 100)

Scheme 2 Synthetic routes of C-PAES-m/n(m/n=90/10, 80/20, 70/30, 60/40)

Fig.1 1H NMR spectra of TA-PAES-70(a), TA-PAES-80(b) and TA-PAES-100(c) in CDCl3(A) (B) Magnification of the circle in (A).

Fig.2 1H NMR spectrum of QA-PAES-100 in DMSO-d6

Fig.3 1H NMR spectrum of the QA-PAES-90/10 in DMSO-d6

Table 1 Properties of the C-PAES and L-PAES membranes

Sample	IEC/(mmol·g^-1)		Water uptake(%)		Swelling ratio(%)
Sample	Theoretical	Experimental	20 ℃	60 ℃	20 ℃	60 ℃
C-PAES-60/40	3.26	3.20	42	48	17	19
C-PAES-70/30	3.29	3.27	54	63	28	32
C-PAES-80/20	3.31	3.28	78	94	39	45
C-PAES-90/10	3.34	3.31	94	115	53	63
L-PAES-70	2.61	2.60	110	276	62	132
L-PAES-80	2.88	2.82	198		176

Fig.4 Hydroxide conductivity of C-PAES-m/n membranes at 20 ℃

Fig.5 Impact of temperature on conductivity of C-PAES-90/10(a), C-PAES-80/20(b), C-PAES-70/30(c) and C-PAES-60/40(d)

Table 2 Mechanical properties of the C-PAES-m/n and L-PAES-x

Sample	Tensile strength/MPa	Young’s modulus/MPa	Elongation at break(%)	Sample	Tensile strength/MPa	Young’s modulus/MPa	Elongation at break(%)
C-PAES-60/40	64.0	1720	15.9	C-PAES-90/10	50.1	1430	22.3
C-PAES-70/30	60.5	1650	18.7	L-PAES-70	48.5	530	90.9
C-PAES-80/20	56.0	1540	19.8	L-PAES-80	30.3	320	120.2

Fig.6 Methanol diffusion coefficients of cross-linked membranes

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