No abstract

Novel organic-inorganic hybrid membranes, based on poly(2,6-dimethyl-1,4-phenylene oxide), have been prepared through 1,2-dimethylimidazole functional groups and double crosslinking agents including 3-glycidyloxypropyltrimethoxysilane and tetraethyl orthosilicate by sol-gel process for the purpose of improving the conductivity and alkaline resistance. The structure of membranes was characterized using Fourier-transform infrared spectra, 1 H NMR, and X-ray diffraction. The physico-chemical properties of all membranes were shown in ion exchange capacity, water uptake, stability, and conductivity. Membranes with OHconductivity up to 0.022 at 25 8C and 0.036 S cm 21 at 80 8C. Promisingly, the chemical stability of the resulting membranes remains unchanged after storage in 2 mol dm 23 KOH at 25 8C over at least 10 days. The tensile strength can be higher than 30 MPa, and the elongation at break (Eb) is in the range 6.68-10.84%. Hence, this hybrid membrane can be potentially applied in alkaline fuel cells.

In this paper, high-entropy alloy (HEA) particle-reinforced magnesium matrix composites were successfully prepared by the spark plasma sintering (SPS) technology. The effect of the addition of HEA particles on the microstructural evolution, compressive properties and wear properties was investigated. Given its weak binding with other HEA elements, Cu was the element that separated in the initial HEA-reinforced material and combined with Mg to produce CuMg2 dispersed in the matrix. The microhardness of the SPSed composite was 45.9% higher than that of the magnesium matrix. The SPSed composite with HEA particle content of 15 vol.% had the best compressive strength, and the ultimate compressive strength reached 269 MPa. With increased AlCoCuFeNi particles, the matrix could avoid fatigue wear, and the abrasive wear mechanism dominated.

No abstract

No abstract