What is Buna-S? Name the monomers used for its preparation. Mention its use.

How are low density polyethylene and high density polyethylene manufactured? Why do they differ in their densities?

154.

Depict the probable structure of vulcanised rubber molecules. 

What is vinyl polymerization? Explain it briefly.

Write the equation for the synthesis of melamine polymer. Mention one important use of this polymer.

What are additional polymers? Explain briefly with an example.

Which polymer is used for making plastic crockery? Give its monomer, polymerization and uses.

Differentiate between number average and weight average molecular masses of polymers.