21E - Organic Chemistry (Mcmurry)

Question

Draw a three-dimensional representation of segments of the following polymers:

 (a) Syndiotactic polyacrylonitrile

 (b) Atactic poly (methyl methacrylate)

 (c) Isotactic poly (vinyl chloride)

Step-by-Step Solution

Answer

Step1: Syndiotactic polyacrylonitrile

The Syndiotactic polymers are the polymers in which the stereochemistry of the groups on the polymer chain is arranged alternately.

In simple words, we can say that the substituents in Syndiotactic polymer are arranged in the alternate pattern.

The structure of Syndiotactic polyacrylonitrile is as follows;

Step 2: Atactic poly (methyl methacrylate)

In a linear polymer when a substituents are placed asymmetrically in a repeating unit of polymer chain is called an Atactic polymer.

In simple words, we can say that the substituents in the Atactic polymer are arranged randomly. The structure of Atactic poly (methyl methacrylate) is as follows;

Step 3: Isotactic poly (vinyl chloride)

In a linear polymer when substituents are placed symmetrically in a repeating unit of the polymer chain is called an isotactic polymer.

In simple words, we can say that the substituents in the isotactic polymer are arranged in the same manner. The structure of isotactic poly (vinyl chloride) is as follows;