The author of 《Isolation of cyclic penta(ethylene oxide) from mixtures with its linear analog by combining selective intercalation into graphite oxide and solvent approaches》 were Ruiz, Daniel; Alegria, Angel; Barroso-Bujans, Fabienne. And the article was published in Separation and Purification Technology in 2019. Recommanded Product: 33100-27-5 The author mentioned the following in the article:
Cyclic oligomers of poly(ethylene oxide)s intercalate slower into graphite oxide (GO) than their linear analogs from the melt. In present study these kinetic differences are exploited to isolate 15-crown-5 (15C5) from mixtures with linear penta(ethylene glycol) (5EG) by using 2 approaches: (a) melt intercalation and solvent extraction and (b) intercalation from solution and filtration. In both cases fractions highly enriched in the cyclic component are obtained by using an appropriate selection of the solvent. Solvents that do not penetrate the interlayer space of GO (such as CCl4 and toluene) increases the cyclic fraction from 50% in the initial mixture to values ≤99%. On the contrary, solvents that penetrate the interlayer space of GO produce fractions with low content of 15C5. The ability of nonpenetrating solvents to achieve an effective isolation of 15C5 demonstrates that separation is driven by a faster intercalation of 5EG into unswollen GO, without solvent assistance, and the permanence of 15C5 in solution These results are discussed in the light of data collected by x-ray diffraction, DSC and gel permeation chromatog. This study provides substantial evidence of a very promising separation method for a topol. purification of cyclic poly(ethylene oxide)s with GO. In the part of experimental materials, we found many familiar compounds, such as 1,4,7,10,13-Pentaoxacyclopentadecane(cas: 33100-27-5Recommanded Product: 33100-27-5)
1,4,7,10,13-Pentaoxacyclopentadecane(cas: 33100-27-5) is a member of crown ether Ligands. Crown-ethers are macrocyclic polyethers capable of forming host-guest complexes, especially with inorganic and organic cations. Crown-ethers can incorporate protonated primary amine compounds by formation of ion-dipole bonds with the oxygen atoms of the chiral selector. Crown-ethers have been widely used for the separation of several pharmaceuticals both in aqueous and non-aqueous media. Recommanded Product: 33100-27-5
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem