Fundamentals of Materials Science and Engineering: An Integrated Approach, 3e

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104 • Chapter 4 / Polymer Structures

H

C

H

H

C

CH 3

H

C

H

H

C

Repeat unit

(c)

CH 3

H

C

H

H

C

CH 3

H

C

H

H

C

CH 3

H

C

H

H

C

Cl

H

C

H

H

C

Repeat unit

(b)

Cl

H

C

H

H

C

Cl

H

C

H

H

C

Cl

F

C

F

F

C

F

F

C

F

F

C

Repeat unit

(a)

F

F

C

F

F

C

F

F

C

F

F

C

F

Figure 4.2 Repeat unit and chain structures for

(a) polytetrafluoroethylene, (b) poly(vinyl

chloride), and (c) polypropylene.

Table 4.3 A Listing of Repeat Units for 10 of the More Common

Polymeric Materials

Polymer Repeat Unit

C

H

H

H

H

C

VMSE

Repeat Unit

Structures Polyethylene (PE)

C

H

H

H

Cl

Poly(vinyl chloride) (PVC) C

C

F F

FF

Polytetrafluoroethylene (PTFE) C

C

H

H

H

CH 3

Polypropylene (PP) C

C

H

H

H

Polystyrene (PS) C

(Continued)