Chapter 20, Problem 59A

Interpretation Introduction

Interpretation:

The structure of acrylonitrile and butadiene is to be drawn and polymerization of both compounds is to be done and their uses are to be written.

Concept introduction:

Acrylonitrile and butadiene are monomer units for polymer PAN and natural rubber.

These monomer units join together in a large number of units and form a polymer.

Answer to Problem 59A

Structure of acrylonitrile is:

  

Structure of butadiene is:

  

Repeating unit when acrylonitrile polymerize:

  

Polyacrylonitrile

Repeating unit when butadiene polymerize:

  

Use of polyacrylonitrile: It is used as fibers to make knitting clothes, in sails for yachts.

Use of polybutadiene: Rubber is used in automobiles for making tyres and used as a sealant.

Explanation of Solution

When acrylonitrile is polymerized, it is converted into polyacrylonitrile(PAN).

  

When the cis-form of butadiene is polymerized, it becomes a natural rubber. It is also called as Gutta-percha.

  

Uses of PAN are:

• It is used as fibers to make knitting clothes.
• It is used in sails for yachts.

Uses of natural rubber:

• Rubber is used in automobiles for making tyres.
• It is used as a sealant.

Conclusion

Thus, on polymerization, properties of a substance are changed.