repeat
unit
repeat
unit
H H H H H H
C C C C C C
H H H H H H
H H H H H H
C C C C C C
H Cl H Cl H Cl
Polyethylene (PE)
Polyvinyl chloride (PVC)
Chapter 14: Polymer structures
Chapter 14: Polymer structures
repeat
unit
H
C
H
H H
C C
CH3 H
H H
C C
CH3 H
H
C
CH3
Polypropylene (PP)
1
2
1
Ni
Mi
# of students
mass (lb)
1
1
2
3
2
1
100
120
140
180
220
380
xi
wi
0.1
0.1
0.2
0.3
0.2
0.1
0.054
0.065
0.151
0.290
0.237
0.204
Mn
Mw
186 lb
216 lb
Chapter 14: Polymer structures
3
Degree of polymerization, n
H H H H H H H H H H H H
H C C (C C ) C C C C C C C C H
H H H H H H H H H H H H
Chapter 14: Polymer structures
4
2
Molecular structures
secondary
bonding
Linear
Branched
Cross-Linked
Network
5
Chapter 14: Polymer structures
random
alternating
block
graft
Chapter 14: Polymer structures
6
3
Polymer crystallinity
10 nm
unit cell
7
Chapter 14: Polymer structures
Polymer crystallinity
Chapter 14: Polymer structures
8
4