Chemistry Reference
In-Depth Information
The following are examples of simple constitutional repeat units:
O
n
n
n
polymethylene
polyoxyethylene
poly(1-butenylene)
8. Polymers with repeating units consisting of more than one simple bivalent radical should be
named according to the order of seniority among the types of bivalent radicals: (a) heterocyclic
rings, (b) chains containing hetero atoms, (c) carbocyclic rings, and (d) chains containing only
carbons. This is illustrated below:
O
n
n
N
poly
(
3,5
-
pyridinediylmethyleneoxy
-
1,4
-
phenylene)
poly
(
2,6
-
biphenyleneethylene)
9. Double-stranded or “ladder” polymers that have tetravalent repeat units are named similarly to
bivalent units. The relation of the four free valences is denoted by pairs of locants separated by a chain:
n
poly
(
1,2:1,2
-
ethane diylidene
)
n
poly
(
2,3,6,7
-
naphthalenetetrayl
-
6,7
-
dimethylene
)
10. For polymers that contain heteroatoms or acyclic subunits containing heteroatoms there is a
decreasing seniority in naming. It is in the following order, O, S, Se, Te, N, , Sb, Bi, Si, Ge, Sn,
Pb, B. Similarly, for polymers containing ring structures, the seniority if for the heterocyclic ring
to have greater seniority that heteroatoms or acyclic subunits. Similarly, heterocyclic subunits
have greater seniority than do carbocyclic ring and they in turn have greater seniority than acyclic
substructures. An example would be,
N
n
poly(2,4-pyridinediiyl-1,4-phenylene)
