2023
DOI: 10.1039/d3im00064h
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The effect of grafted alkyl side chains on the properties of poly(terphenyl piperidinium) based high temperature proton exchange membranes

Xuefu Che,
Lele Wang,
Ting Wang
et al.

Abstract: New high-performance high temperature proton exchange membranes have been developed for fuel cell applications.

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Cited by 21 publications
(7 citation statements)
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“…Notably, TMG/PBI- X membranes exhibit higher chemical stability than pure PBI membranes; TMG/PBI-10 and TMG/PBI-20 membranes show weight retentions of 81.62 and 76.92%, respectively. Guanidinium ions exhibit excellent thermal and chemical stability owing to the highly stable delocalization of the positive charge in guanidinium ions over the central C atom and three N atoms through conjugated bonds. ,, Additionally, the alkyl side chains of guanidinium ions show a tendency to aggregate, which prevents free radicals from attacking the polymer backbone. , …”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…Notably, TMG/PBI- X membranes exhibit higher chemical stability than pure PBI membranes; TMG/PBI-10 and TMG/PBI-20 membranes show weight retentions of 81.62 and 76.92%, respectively. Guanidinium ions exhibit excellent thermal and chemical stability owing to the highly stable delocalization of the positive charge in guanidinium ions over the central C atom and three N atoms through conjugated bonds. ,, Additionally, the alkyl side chains of guanidinium ions show a tendency to aggregate, which prevents free radicals from attacking the polymer backbone. , …”
Section: Resultsmentioning
confidence: 99%
“…31,34,37 Additionally, the alkyl side chains of guanidinium ions show a tendency to aggregate, which prevents free radicals from attacking the polymer backbone. 41,47 Mechanical Properties. The mechanical strength of PEMs can significantly influence their practical applications in HT-PEMFCs.…”
Section: Preparation Of Guanidinium Groups Functionalized Pbi (Tmg/pbi)mentioning
confidence: 99%
“…Moreover, the absorption bond at 1593 cm −1 was caused by the stretching vibration of C�N bonds in pyridinium groups in P4VP, 17,26,49 while characteristic peaks at 3028 and 2909 cm −1 were due to the aromatic and aliphatic C−H stretching. 20,21,53 Meanwhile, a broad absorption peak at 3366 cm −1 was found in pure P4VP and x%CL-PP membranes, which can be attributed to the presence of O−H groups. 25 As previously reported, PVC and PVBC are hydrophobic polymers and barely absorb moisture from the surrounding atmosphere.…”
Section: Ft-ir and Xpsmentioning
confidence: 96%
“…8,15 Upon grafting GTA into PBFI, new peaks emerged. A characteristic peak of the hydroxyl group appeared at 5.32 ppm, 16,29 while peaks at 3.13 ppm and 3.50 ppm were assigned to end-group methyl groups and aliphatic methylene bonds, 28,30,31 respectively. Concurrently, the intensity of the peak associated with the –NH– group at 10.8 ppm diminished significantly.…”
mentioning
confidence: 99%
“…In contrast, PBFI-86%GTA shows a reduced decomposition temperature of 250 °C, which is likely due to the degradation of grafted GTA side chains. 11,30 Nevertheless, the PBFI-86%GTA membrane remains suitable for HT-PEMFCs, typically operated below 200 °C. The microphase separation structure positively influences ion transport.…”
mentioning
confidence: 99%