Question

Why polyethylene glycol is used as solvent?

Answer 1

Polyethylene glycol (PEG) is a polyethercompound with many applications from industrial manufacturing to medicine. PEG is also known as polyethylene oxide (PEO) or polyoxyethylene (POE), depending on its molecular weight. The structure of PEG is commonly expressed as H−(O−CH2−CH2)n−OH.

Polyethylene glycolNamesIUPAC names

poly(oxyethylene) {structure-based},
poly(ethylene oxide) {source-based}[1]

Other names

Carbowax, GoLYTELY, GlycoLax, Fortrans, TriLyte, Colyte, Halflytely, Macrogol, MiraLAX, MoviPrep

Identifiers

CAS Number

25322-68-3 

ChEMBL

ChEMBL1201478 

ChemSpider

none

ECHA InfoCard100.105.546E numberE1521 (additional chemicals)UNII

3WJQ0SDW1A 

Properties

Chemical formula

C2nH4n+2On+1Molar mass18.02 + 44.05n g/molPharmacology

ATC code

A06AD15 (WHO)HazardsFlash point182–287 °C; 360–549 °F; 455–560 K

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

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Answer 2

The polymer is used as a lubricating coating for various surfaces in aqueous and non-aqueous environments. Since PEG is a flexible, water-soluble polymer, it can be used to create very high osmotic pressures (on the order of tens of atmospheres).