Preparation and properties of composite proton exchange membranes with high proton conductivity and dimensional stability

doi:10.19491/j.issn.1001-9278.2022.08.010

Abstract

Abstract:

A UiO?66?NH₂/PAMPS hybrid filler was prepared through the in?situ polymerization of 2?acrylamide?2?methylpropanesulfonic acid in a porous metal organic framework （UiO?66?NH₂）. The resultant filler was then added to the sulfonated poly（ether ether ketone）（SPEEK） to fabricate nanocomposite membranes. The properties of the nanofillers and membranes were investigated. The ordered pore networks of metal organic framework components in UiO?66?NH₂/PAMPS provided fast proton diffusion pathways， and the sulfonic acid groups in PAMPS offered additional sites for proton transfer. This resulted in a significant improvement in proton conductivity of the nanocomposite membranes. The experimental results indicated that there is a strong electrostatic interaction between the filler and matrix， preventing the swelling of the nanocomposite membranes. When the filler content was 6 wt%， the proton conductivity of the nanocomposite membrane containing 6 wt% filler increased from 0.040 S/cm to 0.057 S/cm in water， which was 42.5 % higher than that of SPEEK as a control. Its swelling ratio decreased from 29 % to 23 %.

Key words: proton exchange membrane, sulfonated poly（ether ether ketone）, metal organic framework, 2?acrylamide?2?methylpropanesulfonic acid

CLC Number:

TQ325

WANG Qian, YANG Kangning, ZHAI Shaoxiong, YIN Likun, HE Shaojian, LIN Jun. Preparation and properties of composite proton exchange membranes with high proton conductivity and dimensional stability[J]. China Plastics, 2022, 36(8): 62-68.

Figures/Tables 10

Fig.1. FTIR spectra of UiO?66?NH2 and UiO?66?NH2/PAMPS

Fig.2. XRD patterns of UiO?66?NH2 and UiO?66?NH2/PAMPS

Fig.3. XPS spectra of UiO?66?NH2 and UiO?66?NH2/PAMPS

Fig.4. SEM images of the nano?particles

Fig.5. SEM images of the membranes

Fig.6. IEC of SPEEK and nanocomposite membranes

Fig.7. Water absorption rate of SPEEK and composite membranes

Fig.8. Swelling ratio of SPEEK and composite membranes

Fig.9. σ of SPEEK and composite membranes

Fig.10. Activation energy of SPEEK and SPEEK/UiO?66?NH2/PAMPS?6 membrane

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