Polyethylene glycol PEG 400, 1500, 4000,6000

Sell Polyethylene Glycol
The polyethylene glycols are soluble in many organic solvents: benzene, carbon tetrachloride, chloroform, dimethylformamide, acetonitrile. Well soluble in water. The solubility decreases significantly with increasing molecular weight of the polymer. From a chemical point of view, the terms " polyethylene glycol and polyethylene oxide equivalent, but traditionally, the polyethylene glycols are referred to more low molecular weight adducts with Mr lt; 20,000, and the term polyethylene oxide is applied to high molecular weight polymers. PEG susceptible to oxidative and thermal degradation at temperatures above 310°C, destroyed by the action of high-speed mixing. Is able to form complexes with salts of alkali and alkaline earth metals, chloride of mercury HgCl2, thiocarbamide, polyacrylic acid. The polyethylene glycols are non-toxic and can enter into the composition of food products, and pharmaceuticals. Polymerization takes place by ionic (anionic or cationic) mechanism. The use of anionic polymerization is more preferable, because it allows you to control the polydispersity of the final product. It should be noted that ethylene oxide polymerizes with evolution of heat under certain conditions the reaction is able to accelerate uncontrolled, which can lead to explosion. The main method of synthesis of high molecular weight polymers of ethylene oxide ― suspension polymerization. The growing polymer macromolecule is required to withhold from the coagulation of the slurry during the entire period of polymerization. The process is catalyzed by magnesium, aluminum, or calceolariaceae compounds in the presence of chelating agents to prevent aggregation of the polymer particles during synthesis. Catalysts for synthesis of low molecular weight polyethylene glycols are alkalis NaOH and KOH, as well as soda Na2CO3. The molecular weight of the polymer in this case is determined by the ratio of the initial ethylene glycol and ethylene oxide, as the polymerization proceeds without an open circuit.

Application:

The polyethylene glycols are used as the textile auxiliary agent; as amounts that has a laxative effect; as dispersing agent in toothpastes; as a thickener, for example, in hydraulic fluids; in the pharmaceutical and cosmetic industries as a binder and the basis for tablets, creams, suppositories; in the manufacture of molds for ceramics, powder metallurgy, casting as a binder, stabilizing the shape of the product; as an oligomer in the manufacture of polyurethanes; to obtain a nonionic surface-active substances (surfactants) by covalent binding to hydrophobic molecules (e.g., castor oil); Applications of high-molecular polyethylene glycol: as flocculant and coagulant for the enrichment of ores, concentration of sediments, sludges, paper pulp, coal dust; as an agent for reducing the hydrodynamic resistance in engineering and medicine with injections; for packaging food (water soluble film); in agriculture to create the exact seeding systems (semilente), packaging of agrochemicals; as a binder and thickener in paints and latexes; as the basis for the ion-conductive compositions, including for the production of lithium-polymer battery. as a polar stationary phase for gas chromatography.