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Sulfonated polysulfone proton exchange membrane with flexible side chains for fuel cells
Zongwen Qiao,Jiaqi Deng,Tao Chen 한국고분자학회 2024 Macromolecular Research Vol.32 No.2
In this study, chloromethylated polysulfones (CPS) were used as precursors to synthesize two kinds of sulfonated polysulfones with flexible side chains, namely PS-BS (The end of the side chain contains a sulfonic acid group) and PS-BDS (The end of the side chain contains two sulfonic acid groups). This was achieved through nucleophilic substitution reaction using sodium 4-hydroxybenzenesulfonate and disodium 1,2-dihydroxybenzene-3,5-disufonate as nucleophilic reagents, respectively. The chemical structures of the resulting sulfonated polysulfones were characterized using the Fourier infrared spectrum (FT-IR) and nuclear magnetic hydrogen spectrum ( H1-NMR). The proton exchange membranes (PEMs) were fabricated using a solution casting method. Thermogravimetric analysis (TGA) analysis revealed that the obtained PEMs exhibited stability up to 270 °C. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analysis indicated that PS-BS and PS-BDS PEMs exhibited a clear microphase separation structure, with the hydrophilic sulfonic acid groups located far away from the hydrophobic main chain of PS. This unique structure contributed to improved dimensional stability and oxidative stability of the PEMs. The obtained PEMs show better dimensional stability and oxidative stability. Comparing the two types of PEMs at the same temperature and ion exchange capacity (IEC), PS-BDS PEMs demonstrate better dimensional stability and lower methanol permeability compared to PS-BS PEMs. For instance, PD-BDS-4 PEMs exhibited a dimensional of stability up to 8.6% at room temperature and 30% at 85 °C. The corresponding methanol permeability was 10.29 × 10– 7 cm2/ s at 25 °C, which was significantly lower than that of Nafion112 (10.5 × 10– 7 cm2/ s) PEMs under the same condition.
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Yanbin Li,Baojiao Gao,Tao Chen,Zongwen Qiao 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.5
By using a novel molecular surface-imprinting technique, “synchronously graft-polymerizing and imprinting”method established by our group, a pesticide molecule surface-imprinted material was prepared successfully forthe removal of pesticide residues from water. The micron-sized silica gel particles were first surface-modified withcoupling agent γ-aminopropyltrimethoxysilane (AMPS), obtaining the modified particles AMPS-SiO2, onto whosesurfaces primary amino groups were introduced. The anionic monomer sodium p-styrenesulfonate (SSS) was used asfunctional monomer and N,N'-methylenebisacrylamide (MBA) was used as crosslinker. In aqueous solution, the monomermolecules were arranged around the template molecule, atrazine molecule that is an extensively used herbicide,through electrostatic interaction. By initiating of the redox surface-initiating system of -NH2/S2O82−, the graft/crosslinkingpolymerization of SSS on SiO2 particles and the surface imprinting of atrazine molecule were simultaneouslycarried out, forming atrazine molecule surface-imprinted material MIP-PSSS/SiO2. With propoxur and pirimicarb, whichare also two pesticides as two contrast substances, the recognition performance of the atrazine molecule surface-imprintedmaterial MIP-PSSS/SiO2 was investigated in depth. The experimental results show that MIP-PSSS/SiO2 particles possessspecial recognition selectivity and excellent binding affinity for atrazine. The binding capacity of atrazine on MIPPSSS/SiO2 particles can get up to 61 mg/g, and relative to propoxur and pirimicarb, the selectivity coefficients of MIPPSSS/SiO2 for atrazine are 9.69 and 8.79, respectively.
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