Degradable polymers have proven effective for marine antibiofouling. It is important to improve their performance by optimizing their structures. We have prepared polyurethane with degradable polyester segments in the main chain and hydrolyzable poly(triisopropylsilyl acrylate) (PTSA) side chains and used it as the carrier of organic antifoulant (DCOIT). Our study demonstrates that the degradation rate of the polymer increases as the ester group density in the main chain or the length of side chain increases. On the other hand, the release rate of the organic antifoulant increases with the length of side chain. However, it shows a maximum as the ester group density increases. Marine field tests demonstrate that the antifouling of the system increases as the ester group density or the length of side chain increases.
Lei Zhang,Shi Wang,Jingyu Li,Xu Liu,Pingping Chen,Tong Zhao,Liaoyun Zhang
Polyether-based materials, especially poly(ethylene oxide) (PEO) and derivatives thereof, have been extensively studied as Li-conducting all-solid-state polymer electrolytes (SPEs) for Li-based batteries due to their specific advantages such as easy fabrication, high safety, and outstanding compatibility with lithium salts. However, PEO-based polymers usually have too strong complexation ability with lithium ions and high crystallinity, resulting in a low lithium-ion transference number and room temperature ionic conductivity. In this study, we choose hyperbranched polyethylenimine (HPEI) as the core of a SPE matrix, while polyester segments as the arms through sequential ring-open polymerization (ROP) of glycolide (GC) and ε-caprolactone (CL). Specifically, the HPEI core containing N atoms can promote the dissociation of lithium salts, while the polyester segments can effectively dissolve lithium salts and transport ions. Furthermore, the SPE (HPEI–PGC–PCL/LiTFSI) is cast onto a ceramic film containing ceramic nanowires to prepare a composite SPE (CSPE), which can further construct ion transport channels at the interface of the polymer and nanowires. Synergizing the advantages of HPEI–PGC–PCL and ceramic nanowires, the CSPE exhibits superior electrochemical performance. Especially, the LiFePO4/CSPE/Li cell exhibits a discharge capacity of 162 mA h g−1 at the C-rates of 0.2, 0.5 and 1C, and an average discharge capacity of 158 mA h g−1 with an average coulombic efficiency of 99.8% over 200 cycles at 0.5C. More importantly, the LiCoO2/CSPE/Li cell also shows very good cycling performance (reaches 130 mA h g−1 at a current density of 0.06 mA cm−2) and rate capacity (reaches 80 mA h g−1 at a current density of 0.3 mA cm−2). This work highlights a new and novel host material that has the potential to be used as a high performance all-solid-state electrolyte for solid-state batteries.
危险品化学品经营许可证（带存储）