Abstract:A series of polybenzimidazoles (PBIs) incorporated main chain 4-pyridine bridge groups were synthesized from 4,4′-([4,4′-bipyridine]-2,6,-diyl)bis (benzene-1,2-diamine) which reacted with four different diacids like isophthalic acid,4,4′-Oxibis benzoic acid, 5-amino isophthalic acid and 2,5-pyridine dicarboxylic acid using polyphosphoric acid as solvent. A process termed dispersion polymerizationhas been developed to prepare PBIs.For the membranepreparation, 4-pyridine-bridge polybenzimidazole (Py-PBI) product… Show more
“…An optimum water uptake is necessary to obtain a PEM with both desirable mechanical stability and proton conductivity. 33 Water absorption by 2-Py-PBIs:PVPA membranes with various diacid monomers are hygroscopic polymers and have a great preference for forming intermolecular interactions with water molecules. After immersing the membranes in distilled water for 4 h at different temperatures, It has been observed that the quantity of water absorption in the 221I, 224P, 225A, and 22AO membranes at 35°C.…”
Section: Resultsmentioning
confidence: 99%
“…A programmable temperature controller with ramp and soak functions was used to regulate the reaction temperature (Scheme 1). 33 Scheme 1.Polymer Synthesis: Derivatives of 2-Py-PBIs polymers were synthesized from derivative of 2-Py-TAB monomer with various dicarboxylic acids by dispersion polymerization. The polymer are abbreviated as 2-Py-PBI-Ar, where ‘Ar’ indicates the DCA used in the polymerization.…”
Section: Methodsmentioning
confidence: 99%
“…The water uptake of membrane (WU%) was calculated by the following equation (1). 33 where, W wet is the weight of 1 × 1 cm of wet membrane and W dry is the weight of 1 × 1 cm of dry membrane.…”
Section: Methodsmentioning
confidence: 99%
“…A programmable temperature controller with ramp and soak functions was used to regulate the reaction temperature (Scheme 1). 33 For a 24 h, the temperature of polymerization kept 180 to 200°C and converted to viscous material. After being added to n-hexane (3 times with 100 mL) and followed by water, the reaction mixture was separated as mass.…”
Section: Synthesis Of Polybenzimidazolementioning
confidence: 99%
“…The water uptake of membrane (WU%) was calculated by the following equation (1). 33 Water Uptake ðWU%Þ ¼…”
The present study has focused on exploring new 2-pyridine-bridge-based polybenzimidazole (2-Py-PBIs) based materials for various energy-related uses in proton exchange membrane fuel cells (PEMFC). An electrochemical device, which transforms chemical energy into electrical energy, is known as fuel cell. Using solution polymerization with polyphosphoric acid as a solvent, a series of 2-Py-PBIs were synthesised from the 4,4'-([2,4′-bipyridine]-2′,6′-diyl)bis (benzene-1,2-diamine). 2-Pyridine bridge Polybenzimidazoles are cross-linked with poly (vinylphosphonic acid), which helps us to improve membrane properties like mechanical properties and proton conductivities. FT-IR was used to characterize chemical structure, Ubbelohde viscometer was employed to determine the inherent viscosity. Additionally investigated were the oxidative stability, swelling ratio, ion exchange capability, and water uptake for 2-Py-PBIs. Thermogravimetric analysis is used to evaluate thermal stability. The obtained 2-Py-PBIs membranes were thermally stable and mechanically strong when compared with conventional polybenzimidazole-based membranes. The 2-Py-PBIs:PVPA membranes showed proton conductivity between 0.10 µS/m to 4.65 µS/m.
“…An optimum water uptake is necessary to obtain a PEM with both desirable mechanical stability and proton conductivity. 33 Water absorption by 2-Py-PBIs:PVPA membranes with various diacid monomers are hygroscopic polymers and have a great preference for forming intermolecular interactions with water molecules. After immersing the membranes in distilled water for 4 h at different temperatures, It has been observed that the quantity of water absorption in the 221I, 224P, 225A, and 22AO membranes at 35°C.…”
Section: Resultsmentioning
confidence: 99%
“…A programmable temperature controller with ramp and soak functions was used to regulate the reaction temperature (Scheme 1). 33 Scheme 1.Polymer Synthesis: Derivatives of 2-Py-PBIs polymers were synthesized from derivative of 2-Py-TAB monomer with various dicarboxylic acids by dispersion polymerization. The polymer are abbreviated as 2-Py-PBI-Ar, where ‘Ar’ indicates the DCA used in the polymerization.…”
Section: Methodsmentioning
confidence: 99%
“…The water uptake of membrane (WU%) was calculated by the following equation (1). 33 where, W wet is the weight of 1 × 1 cm of wet membrane and W dry is the weight of 1 × 1 cm of dry membrane.…”
Section: Methodsmentioning
confidence: 99%
“…A programmable temperature controller with ramp and soak functions was used to regulate the reaction temperature (Scheme 1). 33 For a 24 h, the temperature of polymerization kept 180 to 200°C and converted to viscous material. After being added to n-hexane (3 times with 100 mL) and followed by water, the reaction mixture was separated as mass.…”
Section: Synthesis Of Polybenzimidazolementioning
confidence: 99%
“…The water uptake of membrane (WU%) was calculated by the following equation (1). 33 Water Uptake ðWU%Þ ¼…”
The present study has focused on exploring new 2-pyridine-bridge-based polybenzimidazole (2-Py-PBIs) based materials for various energy-related uses in proton exchange membrane fuel cells (PEMFC). An electrochemical device, which transforms chemical energy into electrical energy, is known as fuel cell. Using solution polymerization with polyphosphoric acid as a solvent, a series of 2-Py-PBIs were synthesised from the 4,4'-([2,4′-bipyridine]-2′,6′-diyl)bis (benzene-1,2-diamine). 2-Pyridine bridge Polybenzimidazoles are cross-linked with poly (vinylphosphonic acid), which helps us to improve membrane properties like mechanical properties and proton conductivities. FT-IR was used to characterize chemical structure, Ubbelohde viscometer was employed to determine the inherent viscosity. Additionally investigated were the oxidative stability, swelling ratio, ion exchange capability, and water uptake for 2-Py-PBIs. Thermogravimetric analysis is used to evaluate thermal stability. The obtained 2-Py-PBIs membranes were thermally stable and mechanically strong when compared with conventional polybenzimidazole-based membranes. The 2-Py-PBIs:PVPA membranes showed proton conductivity between 0.10 µS/m to 4.65 µS/m.
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