Authors Yoshida-Hirahara, M; Takahashi, S; Yoshizawa-Fujita, M; Takeoka, Y; Rikukawa, M in ROYAL SOC CHEMISTRY published article about POLY(ARYLENE ETHER SULFONE); MULTIBLOCK COPOLYMERS; PERFLUOROSULFONATE IONOMER; TRANSPORT-PROPERTIES; PROTON CONDUCTIVITY; WATER TRANSPORT; KETONE); MORPHOLOGY; TEMPERATURE; MECHANISMS in [Yoshida-Hirahara, Miru; Takahashi, Satoshi; Yoshizawa-Fujita, Masahiro; Takeoka, Yuko; Rikukawa, Masahiro] Sophia Univ, Dept Mat & Life Sci, Chiyoda Ku, 7-1 Kioi Cho, Tokyo 1028554, Japan; [Yoshida-Hirahara, Miru] Saitama Univ, Res & Dev Bur, Sakura Ku, Shimo Okubo 255, Saitama 3388570, Japan in 2020, Cited 45. Name: Diphenyl oxide. The Name is Diphenyl oxide. Through research, I have a further understanding and discovery of 101-84-8
To achieve precise control of sulfonated polymer structures, a series of poly(p-phenylene)-based ionomers with well-controlled ion exchange capacities (IECs) were synthesised via a three-step technique: (1) preceding sulfonation of the monomer with a protecting group, (2) nickel(0) catalysed coupling polymerisation, and (3) cleavage of the protecting group of the polymers. 2,2-Dimethylpropyl-4-[4-(2,5-dichlorobenzoyl)phenoxy]benzenesulfonate (NS-DPBP) was synthesised as the preceding sulfonated monomer by treatment with chlorosulfuric acid and neopentyl alcohol. NS-DPBP was readily soluble in various organic solvents and stable during the nickel(0) catalysed coupling reaction. Sulfonated poly(4-phenoxybenzoyl-1,4-phenylene) (S-PPBP) homopolymer and seven types of random copolymers (S-PPBP-co-PPBP) with different IECs were obtained by varying the stoichiometry of NS-DPBP. The IECs and weight average molecular weights (M(w)s) of ionomers were in the range of 0.41-2.84 meq. g(-1) and 143 000-465 000 g mol(-1), respectively. The water uptake, proton conductivities, and water diffusion properties of ionomers exhibited a strong IEC dependence. Upon increasing the IEC of S-PPBP-co-PPBPs from 0.86 to 2.40 meq. g(-1), the conductivities increased from 6.9 x 10(-6) S cm(-1) to 1.8 x 10(-1) S cm(-1) at 90% RH. S-PPBP and S-PPBP-co-PPBP (4 : 1) with IEC values >2.40 meq. g(-1) exhibited fast water diffusion (1.6 x 10(-11) to 8.0 x 10(-10) m(2) s(-1)), and were comparable to commercial perfluorosulfuric acid polymers. When fully hydrated, the maximum power density and the limiting current density of membrane electrode assemblies (MEAs) prepared with S-PPBP-co-PPBP (4 : 1) were 712 mW cm(-2) and 1840 mA cm(-2), respectively.
About Diphenyl oxide, If you have any questions, you can contact Yoshida-Hirahara, M; Takahashi, S; Yoshizawa-Fujita, M; Takeoka, Y; Rikukawa, M or concate me.. Name: Diphenyl oxide
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