Juyi’erchun 4000the English name：Macrogol 4000－991 his product is a polycondensation mixture of ethylene oxide and water. The molecular formula is HO(CH2CH2O)nH, where N represents the average number of oxyvinyl groups
This product is white waxy solid thin section or granular powder; It smells a little bad. This product is soluble in water but insoluble in ether or ethanol. Condensation point of this product of solidifying point (appendix Ⅵ D) 50 ~ 54 ℃. Viscosity, 25.0 g, proper in 100 ml volumetric flask and add enough water to dissolve and diluted to scale, shake well, use of capillary inner diameter of 0.8 mm flat's viscosity meter, determination (appendix Ⅵ g first law) in accordance with the law, in 40 ℃ kinematic viscosity of 5.5 ~ 9.0 mm < 2 > / S.
The average molecular weight of this product was about 12g, accurately weighed, placed in a dry 250mL corkscrew conical flask, added pyridine 25ml, heated to dissolve, cooled, and determined according to the method of polyethylene glycol 400 item, starting from "precisely adding pyridine solution of phthalic anhydride", the average molecular weight should be 3400 ~ 4200. Acidity, solution clarity and color, and burning residue should be checked by polyethylene glycol 400 method.
Peg is used biologically as a inducer to induce cell fusion