PEG

are family of water-soluble linear

polymers formed by the addition

al reaction of ethylene oxide

(EO) With mono ethylene glycol

s (MEG) or diethylene glycol.

The generalized formula for poly

ethylene glycol is: H(OCH2

CH2) n OH

N: Average number of repeating ethylene oxide groups.

There are many grades of PEGs that represents them by theirs

average molecular weight. For example, PEG 400 consists of a

distribution of polymers of va

rying molecular weights with an

average of 400, which corresponds to an approximate

average number of repeating EO groups (n) of

≈

9.

Polyethylene glycols

are available in average molecular weight

ranging from 200 to 8000; this wide range of products provides

flexibility in choosing properties to meet the requirements o

f

many different applications.

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