Preparation of High-temperature Proton Exchange Membranes Based on Semi-interpenetrating Polymer Networks

doi:10.7503/cjcu20200348

Abstract

Abstract:

To realize the tradeoff between high proton conductivity and high mechanical strength， a semi- interpenetrating polymer network（PIN） based on a sulfonated poly（aryl ether ketone） bearing unsaturated double bonds（Allyl-SPAEK） and an arylether-type polybenzimidazole（PBI） has been fabricated for high- temperature proton exchange membranes in fuel cells. Based on the molecular design and syntheses of Allyl-SPAEK and PBI， a new IPN system composed of covalent bond formed by allyl groups and strong acid-base interactions formed by imidazole-sulfonic acid groups was obtained through a process of solution casting and UV irradiation. The results showed that the PBI/Allyl-SPAEK membranes could have simultaneously improved proton conductivity and mechanical strength， which were much better than the pristine PBI membrane under the same phosphoric acid adsorption level and test conditions. With a phosphoric acid adsorption level of ca.13.0， the maximum tensile strength of one PBI/Allyl-SPAEK membrane was 12.1 MPa， and its young’s modulus reached 131.5 MPa， which was twice of the pristine PBI membrane. At 200 ℃， the proton conductivities of two membranes reached above 200 mS/cm， which was 38% higher than that of the pristine PBI membrane.

Key words: Fuel cell, Polybenzimidazole, Sulfonated poly（aryl ether ketone）, Semi-interpenetrating poly- mer network, High-temperature proton exchange membrane

CLC Number:

O631

TrendMD:

LIANG Minhui, WANG Peng, LI Hongbin, LI Tianyang, CAO Kaiyue, PENG Jinwu, LIU Zhenchao, LIU Baijun. Preparation of High-temperature Proton Exchange Membranes Based on Semi-interpenetrating Polymer Networks[J]. Chem. J. Chinese Universities, 2020, 41(12): 2845.

Figures/Tables 5

References 21

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Membrane	Tensile modulus/MPa	Tensile strain(%)	Tensile stress/MPa	Conductivity/(mS·cm^-1)
Membrane	Tensile modulus/MPa	Tensile strain(%)	Tensile stress/MPa	160 °C	200 °C
PBI	1945.1	54.0	134.1	―	―
PBI/Allyl?SPAEK?10%	2017.3	24.2	133.7	―	―
PBI/Allyl?SPAEK?20%	2261.0	12.2	121.5	―	―
PBI?8.1PA	129.8	61.6	13.2	89	112
PBI/Allyl?SPAEK?10%?8.1PA	152.8	85.1	18.8	101	130
PBI/Allyl?SPAEK?20%?8.0PA	224.1	141.8	28.5	91	121
PBI?13.3PA	64.4	113.0	8.5	135	149
PBI/Allyl?SPAEK?10%?13.3PA	102.2	104.7	11.7	193	206
PBI/Allyl?SPAEK?20%?13.1PA	131.5	95.9	12.1	177	206
CrL?4.6%F6PBI^[16]	180.0	63.0	11.8	―	115
CpPBI?10^[17]	151.5	53.6	10.2	31	46
OHPyPBI^[18]	119.0	27.9	4.6	―	102(180 °C)
10%S?POSS^[19]	47.0	54.0	3.4	110	―

Membrane	Tensile modulus/MPa	Tensile strain(%)	Tensile stress/MPa	Conductivity/(mS·cm^-1)
Membrane	Tensile modulus/MPa	Tensile strain(%)	Tensile stress/MPa	160 °C	200 °C
PBI	1945.1	54.0	134.1	―	―
PBI/Allyl?SPAEK?10%	2017.3	24.2	133.7	―	―
PBI/Allyl?SPAEK?20%	2261.0	12.2	121.5	―	―
PBI?8.1PA	129.8	61.6	13.2	89	112
PBI/Allyl?SPAEK?10%?8.1PA	152.8	85.1	18.8	101	130
PBI/Allyl?SPAEK?20%?8.0PA	224.1	141.8	28.5	91	121
PBI?13.3PA	64.4	113.0	8.5	135	149
PBI/Allyl?SPAEK?10%?13.3PA	102.2	104.7	11.7	193	206
PBI/Allyl?SPAEK?20%?13.1PA	131.5	95.9	12.1	177	206
CrL?4.6%F6PBI^[16]	180.0	63.0	11.8	―	115
CpPBI?10^[17]	151.5	53.6	10.2	31	46
OHPyPBI^[18]	119.0	27.9	4.6	―	102(180 °C)
10%S?POSS^[19]	47.0	54.0	3.4	110	―

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