Chapter 26, Problem 26.7P

Interpretation Introduction

Interpretation:

Polypropylene, whose repeating unit is shown here, has been synthesized in atactic and isotactic forms. Each polymer is to be drawn, using the ones shown in Figure 26-12 as a guide.

Concept introduction:

The polymer is isotactic if all configurations are the same and atactic if the configurations have no regular pattern. The atactic form can be produced in the absence of a catalyst, simply by treating the monomer with a radical initiator such as benzoyl peroxide. To produce the isotactic form, a Ziegler–Natta catalyst is used.