LCST behavior controlled by size-matching selectivity from low molecular weight monomer systems

Luo, Zheng; Deng, Yan; Li, Xing; Zhang, Qiao; Wu, Jianfeng; Qi, Zhenhui; Lin, Jin; Dong, Shengyi

doi:10.1039/c9nj00846b

Cited by 5 publications

(2 citation statements)

References 63 publications

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“…On-going research has further demonstrated the general principles of the spatial topology factor and site-fitting effect in CE-containing ionic systems (Huang et al, 2018;Luo et al, 2019;Pan et al, 2021). Chen et al observed a similar coexisting salting-in and salting-out effect (Huang et al, 2018) when C7 was functionalized on a poly (vinyl alcohol) polymer system, demonstrating that CEs can serve as general building blocks to control ion specificity in aqueous media.…”

Section: Ces With Ions: Revisiting the Hofmeister Seriesmentioning

confidence: 95%

The aqueous supramolecular chemistry of crown ethers

Qin

Wang

et al. 2023

Front. Chem.

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This mini-review summarizes the seminal exploration of aqueous supramolecular chemistry of crown ether macrocycles. In history, most research of crown ethers were focusing on their supramolecular chemistry in organic phase or in gas phase. In sharp contrast, the recent research evidently reveal that crown ethers are very suitable for studying abroad range of the properties and applications of water interactions, from: high water-solubility, control of Hofmeister series, “structural water”, and supramolecular adhesives. Key studies revealing more details about the properties of water and aqueous solutions are highlighted.

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Section: Ces With Ions: Revisiting the Hofmeister Seriesmentioning

confidence: 95%

The aqueous supramolecular chemistry of crown ethers

Qin

Wang

et al. 2023

Front. Chem.

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“…An advantage of this linear versus cyclic approach is the wide availability of crown ethers, such as 12-crown-4, 15-crown-5, and 18-crown-6, as starting materials which facilitates comparison of isomeric side-chains. In addition, compared with their corresponding linear chain analogues, crown ethers exhibit size-dependent supramolecular recognition for specific metal ions . Because the chelating selectivity of a crown ether can be adjusted through the number of ether groups, crown ethers have been investigated in a number of ion-selective materials with various polymer backbones. , However, there are only a limited number of reports describing PEO copolymers bearing crown ether substituents. , …”

Section: Introductionmentioning

confidence: 99%

Role of Side-Chain Architecture in Poly(ethylene oxide)-Based Copolymers

et al. 2020

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Copolymerization of ethylene oxide and a series of glycidyl ethers with precise linear/cyclic oligo(ethylene oxide) side-chains allows access to a library of well-defined poly(ethylene oxide) (PEO)-based copolymers with 2–50 mol % side-chain functionality. The structure of the linear and cyclic oligo(ethylene oxide) glycidyl ether monomers influences the apparent reactivity ratios, which were consistent with gradient-type architectures. From these isomeric side-chain materials, the solution phase behavior, semicrystallinity, and ionic conductivity of the linear and crown ether side-chain functional copolymers were characterized and compared to conventional, linear PEO homopolymers. Incorporation of linear side-chains decreased the cloud point, whereas incorporation of the crown ether side-chain functionality did not affect the cloud point when compared to linear PEO. In contrast, an ion-selective response of the cloud point was observed for the crown ether side-chain copolymers with minimal response for the isomeric linear systems. In the solid state, the copolymer materials could be tuned from semicrystalline to completely amorphous as the incorporation of linear or cyclic comonomers was increased. Ionic conductivity was characterized by using both lithium and sodium bis(trifluoromethylsulfonyl)imide and found to be consistent with amorphous PEO-based copolymer materials. Linear side-chain functional copolymers exhibited significantly higher ionic conductivity than their crown ether side-chain analogues due to the lower T g of corresponding salt/copolymer blends. Finally, a readily available linear oligo(ethylene glycol) monomer based on a commercial starting material was prepared and copolymerized with ethylene oxide to give a copolymer with properties comparable to the corresponding precise analogues. These new structures allow for the development of property-tailored hydrophilic PEO-based copolymers for a variety of materials applications.

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