What are elastomers? Write the chemical equation to represent the preparation of Buna-S.
Elastomers: They are polymers in which polymer chains are held together by the weakest intermolecular forces. They can be stretched due to weak forces of attraction.
Buna-S can be prepared by reaction of 1, 3-butadiene and styrene in presence of sodium as a polymerising agent.
Differentiate between chain growth and step growth polymerization. Give the structural formula one polymer of each type.
Differentiate between elastomers and fibres on the basis of inter-molecular forces. Give one structural formula of each type of polymers.
Will you prefer to polymerize acrylo-nitrile under anionic or cationic polymerization conditions? Explain your choice.
How are polymers classified into different categories on the basis of intermolecular forces? Give one example of a polymer of each of these categories.
What are the different ways of initiating addition polymerization? Describe one of them for polymerising vinyl chloride.
Why is cationic polymerization preferred in case of vinylic monomers containing electron donating groups?
