An ideal proton exchange membrane for fuel-cell application should possess excellent dimensional stability, high ionic conductivity and inexpensiveness. Introducing cross-links into the polymer structures is a popular strategy to alleviate the tradeoff between swelling ratio and ionic conductivity of high ion exchange capacity proton exchange membranes. However, the cross-links in these membranes will block the transport of H + , resulting in unfavorable decrease of conductivity. Here we report a systematic study of ac SPEEK-S x membranes with alkyl chain attached ionic cross-links to demonstrate how the unique cross-links can improve both the conductivity and swelling behavior of the materials. Compared to the conventional SPEEK , in addition to high anti-oxidative stability, the ionic conductivity and swelling behavior of the ac SPEEK-S x samples are significantly improved. A high proton conductivity of 101.2 mS cm −1 and a low swelling degree of 15.0% are observed in the ac SPEEK-S 6 membrane at the temperature of 80 °C. Based on the high-performance ac SPEEK-S 6 sample, a peak power density of 750 mW cm −2 is achieved at 60 °C, which is similar or superior to those of Nafion 112 (710 mW cm −2 ) under the same measurement conditions.
The overall aim of the current study is to develop a dual-functional PEEK implant to simultaneously fight off bacterial contamination and promote osseointegration by sustained release of moxifloxacin hydrochloride (MOX) and osteogenic growth peptide (OGP) from mussel-inspired polydopamine (PDA)-coated porous sulfonated PEEK (SPK) surface. Our study revealed that the MOX/OGP PDA-modified SPK (SPD-MOX/OGP) surface exhibited a durable and excellent antibacterial effect against planktonic/adherent Staphylococcus aureus and Escherichia coli in vitro . A remarkable enhancement in specific cell adhesion, proliferation and osteogenicity were observed on the SPD-MOX/OGP substrate due to the presence of OGP and PDA molecules compared to all other groups. More significantly, using the infected and non-infected rat tibia models confirmed the in vivo antimicrobial and osteogenesis abilities of SPD-MOX/OGP. Therefore, we are confident that such dual-functional PEEK surface with both antibacterial and osseointegrative capacities in this study would give a positive answer to periprosthetic joint infection-related issues.
危险品化学品经营许可证（带存储）