Jing, Benxin; Wang, Xiaofeng; Shi, Yi; Zhu, Yingxi; Gao, Haifeng; Fullerton-Shirey, Susan K. published an article in 2021. The article was titled 《Combining hyperbranched and linear structures in solid polymer electrolytes to enhance mechanical properties and room-temperature ion transport》, and you may find the article in Frontiers in Chemistry (Lausanne, Switzerland).Electric Literature of Br2Cu The information in the text is summarized as follows:
Polyethylene oxide (PEO)-based polymers are commonly studied for use as a solid polymer electrolyte for rechargeable Li-ion batteries; however, simultaneously achieving sufficient mech. integrity and ionic conductivity has been a challenge. To address this problem, a customized polymer architecture is demonstrated wherein PEO bottle-brush arms are hyperbranched into a star architecture and then functionalized with end-grafted, linear PEO chains. The hierarchical architecture is designed to minimize crystallinity and therefore enhance ion transport via hyperbranching, while simultaneously addressing the need for mech. integrity via the grafting of long, PEO chains (Mn = 10,000). The polymers are doped with lithium bis(trifluoromethane) sulfonimide (LiTFSI), creating hierarchically hyperbranched (HB) solid polymer electrolytes. Compared to electrolytes prepared with linear PEO of equivalent mol. weight, the HB PEO electrolytes increase the room temperature ionic conductivity from ∼ 2.5 x 10-6 to 2.5 x 10-5 S/cm. The conductivity increases by an addnl. 50% by increasing the block length of the linear PEO in the bottle brush arms from Mn = 1,000 to 2,000. The mech. properties are improved by end-grafting linear PEO (Mn = 10,000) onto the terminal groups of the HB PEO bottle-brush. Specifically, the Young’s modulus increases by two orders of magnitude to a level comparable to com. PEO films, while only reducing the conductivity by 50% below the HB electrolyte without grafted PEO. This study addresses the trade-off between ion conductivity and mech. properties, and shows that while significant improvements can be made to the mech. properties with hierarchical grafting of long, linear chains, only modest gains are made in the room temperature conductivity The experimental process involved the reaction of Cupric bromide(cas: 7789-45-9Electric Literature of Br2Cu)
Cupric bromide(cas: 7789-45-9) can be used as reducing agent, when complexed by three molecules of pyridine initiators for the controlled polymerization of styrene, methyl acrylate and methyl methacrylate.Electric Literature of Br2Cu
Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”