Phosphonic acid functionalized siloxane crosslinked with 3‐glycidoxyproyltrimethoxysilane grafted polybenzimidazole high temperature proton exchange membranes

Abstract

Phosphonic acid functionalized siloxane crosslinked with 3‐glycidoxypropyltrimethoxysilane (GPTMS) grafted polybenzimidazole (PBI) membranes are prepared by sol–gel process. The structure of the membranes is characterized by Fourier‐transform infrared spectroscopy and X‐ray diffraction spectroscopy. SEM images of the membranes show that the membranes are homogeneous and compact. The crosslinked membranes exhibit excellent thermal stability, chemical stability and mechanical property. The proton conductivity of the crosslinked membranes increases by an order of magnitude over range of 20 °C to 160 °C under anhydrous condition, which can reach 3.15 × 10−2 S cm−1 at 160 °C under anhydrous condition. The activation energy of proton conductivity for membranes decreases with increase of PBI, because the formation of hydrogen bond network between the phosphonic acid and the imidazole ring can enhance the continuity of hydrogen bond in the membrane. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44818.

Preparation and characterization of layer‐by‐layer self‐assembly membrane based on sulfonated polyetheretherketone and polyurethane for high‐temperature proton exchange membrane

“…Moreover, the chemical stability could be further improved through grafting or cross‐linking. Kerres J. reported that the cross‐linked PBI membranes have the residual mass value of near 90% after storing in Fenton reagent for 144 h at 68 °C; 3‐glycidoxypropyltrimethoxysilane grafted PBI membrane also shows the oxidative stability with a weight loss of 3.84% after immersion in Fenton's reagent after 48 h at 80 °C . Moreover, polysulfone grafted with sulfonated poly(phenylene sulfide) membrane has a retention ratio of 80% after immersion in Fenton's reagent after 95 h at 80 °C .…”

Advancement in Phosphoric Acid Doped Polybenzimidazole Membrane for High Temperature PEM Fuel Cells: A Review

“…PBI-Ph (with rigid group of phenylene) showed higher acid doping levels, less swelling, higher conductivity, and improved mechanical strength, compared to crosslinked PBI-Pr (with non-rigid group of phenylene chain) and the neat PBI membranes. While Qian et al group has incorporated siloxane network with the addition of phosphonic acid in polymer network [88]. Amino trimethylene phosphonic acid (ATMP) were functionalised with 3glycidoxypropyltrimethoxysilane (GPTMS) before grafting onto the PBI backbone.…”

Synthesis of cross‐linked composite membranes by functionalization of single‐walled carbon nanotubes with 1,4‐butane sultone and sulfanilic acid for fuel cell

“…Many exemplary articles have been reported on this field from both elementary and application contexts. [17][18][19][20] Nonfluorinated PEMs have been extensively scrutinized to moderate the methanol perforation and abstain from the environmental consequence of the fluorinated membrane at the time of preparation. [21][22][23][24] Nonfluorinated PEM constituents are customarily aromatic ring polymers, for instance, sulfonated poly(aryl ether ketone) (SPAEK), 25 sulfonated polysulfone, 26 sulfonated polyethersulfone, 27 and sulfonated polyimide.…”

“…Address the challenges of Nafion membranes by developing distinct or modified PEM constituents has been the blazing research theme for this mechanics in past decennium, centralizing on organic and inorganic components to acquire eminent proton conductivity with low water uptake. Many exemplary articles have been reported on this field from both elementary and application contexts 17–20 . Nonfluorinated PEMs have been extensively scrutinized to moderate the methanol perforation and abstain from the environmental consequence of the fluorinated membrane at the time of preparation 21–24 .…”