GTBL042-04 GTBL042-Callister-v2 September 26, 2007 1:46
2nd Revise Page
118 • Chapter 4 / Polymer Structures
Table 4.5 Chemical Repeat Units That Are Employed in Copolymer Rubbers
Repeat Unit Repeat Unit Repeat Unit Repeat Unit
Name Structure Name Structure
VMSE
Repeat Units
Rubbers Acrylonitrile
H
CC
H
H
C N
Isoprene
H
CC
H H
CH 3 H
CC
H
Styrene
H
CC
H
H
Isobutylene
H
CC
H
CH 3
CH 3
Butadiene
H
CC
H H
H H
CC
H
Dimethylsiloxane Si O
CH 3
CH 3
Chloroprene
H
CC
H H
Cl H
CC
H
0.741 nm
CH
0.494 nm
0.255 nm
Figure 4.10 Arrangement of
molecular chains in a unit cell
for polyethylene. (Adapted
from C. W. Bunn,Chemical
Crystallography,Oxford
University Press, Oxford,
1945, p. 233.)