scholarly journals Increasing lithium extraction performance by adding sulfonated poly (ether ether ketone) into block‐copolymer ethylene vinyl alcohol membrane

2020 ◽  
Vol 95 (5) ◽  
pp. 1559-1568
Author(s):  
Chunfeng Zhang ◽  
Jianfeng Song ◽  
Tao Huang ◽  
Hongxing Zheng ◽  
Tao He
Keyword(s):  
Block Copolymer ◽  
Vinyl Alcohol ◽  
Ethylene Vinyl Alcohol ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Ether Ketone ◽  
Extraction Performance ◽  
Sulfonated Poly

scholarly journals A Comparative Study on Physiochemical, Thermomechanical, and Electrochemical Properties of Sulfonated Poly(Ether Ether Ketone) Block Copolymer Membranes with and without Fe3O4 Nanoparticles

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 536 ◽  
Author(s):  
Ae Kim ◽  
Dong Yoo
Keyword(s):  
Block Copolymer ◽  
Electrochemical Properties ◽  
Fe3o4 Nanoparticles ◽  
Exchange Capacity ◽  
Proton Exchange ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Ether Ketone ◽  
Hydrogen Crossover ◽  
Sulfonated Poly

The composite structure, good porosity, and electrochemical behavior of proton exchange membranes (PEMs) are important characteristics, which can improve the performance of polymer electrolyte fuel cells (PEFCs). In this study, we designed and synthesized an XY block copolymer via a polycondensation reaction that contains sulfonated poly(ether ether ketone) (SPEEK) (X) as a hydrophilic unit and a fluorinated oligomer (Y) as a hydrophobic unit. The prepared XY block copolymer is composed of Fe3O4 nanoparticles to create composite architecture, which was subsequently treated with a 1 M H2SO4 solution at 70 °C for 1 h to eliminate Fe3O4 and generate a pores structure in the membrane. The morphological, physiochemical, thermomechanical, and electrochemical properties of bare XY, XY/Fe3O4-9 and XY(porous)-9 membranes were measured and compared in detail. Compared with XY/Fe3O4-9 composite, the proton conductivity of XY(porous)-9 membrane was remarkably enhanced as a result of the existence of pores as nano-conducting channels. Similarly, the XY(porous)-9 membrane exhibited enhanced water retention and ion exchange capacity among the prepared membranes. However, the PEFC power density of XY(porous)-9 membrane was still lower than that of XY/Fe3O4-9 membrane at 60 °C and 60% relative humidity. Also, the durability of XY(porous)-9 membrane is found to be lower compared with pristine XY and XY/Fe3O4-9 membranes as a result of the hydrogen crossover through the pores of the membrane.

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