High-temperature Proton Exchange Membranes Based on Cross-linked Polybenzimidazole/hyperbranched-polymer Blends

doi:10.7503/cjcu20200656

Abstract

Abstract:

In this study， we introduced a hyperbranched poly（p-chloromethylstyrene）（H-VBC） into a soluble high-molecular weight arylether-type polybenzimidazole（OPBI） matrix， and a new type of cross-linking system（OPBI/H-VBC-1 and OPBI/H-VBC-2） based on polybenzimidazole/hyperbranched polymer was obtained through the convenient solution blending-membrane casting preparation process. Finally， the comprehensive performance of the blend membranes was greatly improved. In comparison to the pristine OPBI membrane， the cross-linked blend membranes had more excellent dimensional stability and resistance to plasticization. After soaking in 85% phosphoric acid for 72 h， the volume swelling ratios of OPBI/H-VBC-2 and OPBI/H-VBC-QA-2（the quaternized membrane） were only 184.2% and 152.4%， respectively； while the swelling ratio of OPBI reached 336.5%. The maximum tensile strengths of OPBI/H-VBC-2 and OPBI/H-VBC-QA-2 reached 36.3 and 21.9 MPa， respectively， which were 56%—233% higher than the 10.9 MPa of OPBI membrane. We also found that the quaternized membranes had a higher ratio of proton conductivity to phosphoric acid absorption level than corresponding unquaternized ones. At 200 ℃， the proton conductivities of the quaternized composite membrane reached 151.5 and 103.4 mS/cm， respectively. Further， a comparative study showed that the quaternized cross-linked blend membranes had a better balance ability of proton conductivity and mechanical strength than most of the reported high-temperature proton exchange membranes（HT-PEMs）.

Key words: Fuel cell, High-temperature proton exchange membrane, Macromolecular crosslinking agent, Hyperbranched polymer, Polybenzimidazole

CLC Number:

O631

TrendMD:

CAO Kaiyue, PENG JinWu, LI Hongbin, SHI Chengying, WANG Peng, LIU Baijun. High-temperature Proton Exchange Membranes Based on Cross-linked Polybenzimidazole/hyperbranched-polymer Blends[J]. Chem. J. Chinese Universities, 2021, 42(6): 2049.

Figures/Tables 7

References 19

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Sample	Tensile strength/MPa	Elongation at break（%)	Young’s modulus/MPa	Volume swelling rate(%)	Conductivity at 200 ℃/(mS·cm^-1)	ADL	?^*
OPBI	10.9	99.7	133.2	336.5	160.1	20.2	7.92
OPBI/H?VBC?1	27.1	89.2	276.4	272.9	135.7	19.3	7.03
OPBI/H?VBC?2	36.3	80.1	305.9	184.2	90.1	12.9	6.98
OPBI/H?VBC?QA?1	17.0	120.2	100.8	212.3	151.5	18.0	8.41
OPBI/H?VBC?QA?2	21.9	79.5	159.6	152.4	103.4	14.7	7.03

Sample	Tensile strength/MPa	Elongation at break（%)	Young’s modulus/MPa	Volume swelling rate(%)	Conductivity at 200 ℃/(mS·cm^-1)	ADL	?^*
OPBI	10.9	99.7	133.2	336.5	160.1	20.2	7.92
OPBI/H?VBC?1	27.1	89.2	276.4	272.9	135.7	19.3	7.03
OPBI/H?VBC?2	36.3	80.1	305.9	184.2	90.1	12.9	6.98
OPBI/H?VBC?QA?1	17.0	120.2	100.8	212.3	151.5	18.0	8.41
OPBI/H?VBC?QA?2	21.9	79.5	159.6	152.4	103.4	14.7	7.03

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