laureths, ceteths, ceteareths, oleths, and PEG ethers of glyceryl cocoates), PEG fatty acids (e.g. Overall, PEG derivatives may include PEG ethers (e.g. Furthermore, PEGs can create additional compounds and complexes through a reaction in their ether bridges. PEGs are used in cosmetics “as is” or in combination with their derivatives in which their 2 terminal primary hydroxyl groups can create mono-, di- and poly-esters, amines, ethers and acetals. PEGs, together with their derivatives, do not have definite chemical entities, rather, they are compound mixtures having different chain lengths. To prevent coagulation of polymer chains in the solution, chelating additives such as dimethylglyoxime are used (1). The reaction is catalyzed by magnesium-, aluminum-, or calcium-organoelement compounds. It is necessary to hold the growing polymer chain in solution during the course of the poly-condensation process. To produce PEO or high-molecular weight PEGs, synthesis is performed by suspension polymerization. Relatively small molecular weight PEGs are produced by the chemical reaction between ethylene oxide and water or ethylene glycol (or other ethylene glycol oligomers), as catalyzed by acidic or basic catalysts. However, PEGs mainly refer to oligomers and polymers with molecular masses below 20,000 g/mol, while PEOs are polymers with molecular masses above 20,000 g/mol, and POEs are polymers of any molecular mass. PEG is also known as polyethylene oxide (PEO) or polyoxyethylene (POE), with the three names being chemical synonyms. For instance, PEG-10,000 typically designates a mixture of PEG molecules (n = 195 to 265) having an average MW of 10,000. Most PEGs are commonly available commercially as mixtures of different oligomer sizes in broadly- or narrowly-defined molecular weight (MW) ranges. Polyethylene glycols (PEGs) are composed of polyether compounds repeating ethylene glycol units according to the constituent monomer or parent molecule (as ethylene glycol, ethylene oxide, or oxyethylene) ( Fig. Additionally, PEG/PPG-17/6 copolymer should be further studied to ensure its safety as a cosmetic ingredient. Currently, PEG-20 glyceryl triisostearate and PEGylated oils are considered safe for cosmetic use according to the results of relevant studies. Overall, much of the data available in this review are on PEGylated oils (PEG-40 and PEG-60 hydrogenated castor oils), which were recommended as safe for use in cosmetics up to 100% concentration. The compounds studied in this review include PEG/PPG-17/6 copolymer, PEG-20 glyceryl triisostearate, PEG-40 hydrogenated castor oil, and PEG-60 hydrogenated castor oil. PEGs, together with their typically nonionic derivatives, are broadly utilized in cosmetic products as surfactants, emulsifiers, cleansing agents, humectants, and skin conditioners. Since many PEG types are hydrophilic, they are favorably used as penetration enhancers, especially in topical dermatological preparations. Princeton's WordNet Rate these synonyms: 2.Polyethylene glycols (PEGs) are products of condensed ethylene oxide and water that can have various derivatives and functions.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |