Chemistry Reference
In-Depth Information
four other monomer residues, and such polymers would therefore be classified as
branched.
CH
3
CH
2
C
x
CO
O
CH
3
1-34
H
CH
2
C
x
CH
2
C
CH
3
CH
3
H
1-35
Branched polymers are those in which the repeating units are not linked solely
in a linear array, either because at least one of the monomers has functionality
greater than 2 or because the polymerization process itself produces branching
points in a polymer that is made from exclusively bifunctional monomers.
An example of the first type is the polymer made, for instance, from glycerol,
phthalic anhydride, and linseed oil. A segment of such a macromolecule might
look like 1-36:
O
HO
C
CH
2
O
C
O
HC
O
C
O
H
H
H
H
H
OC
O
CH
2
C
CH
2
O
C
CH
2
C
C
CH
2
C
C
CH
2
CH
3
O
7
4
O
OH
O
C
H
2
C
O
C
O
1-36
