Short Answer TypeDifferentiate between elastomers and fibres on the basis of inter-molecular forces. Give one structural formula of each type of polymers.
Differentiate between chain growth and step growth polymerization. Give the structural formula one polymer of each type.
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 elastomers? Write the chemical equation to represent the preparation of Buna-S.
What are the different ways of initiating addition polymerization? Describe one of them for polymerising vinyl chloride.
Polymerization can be initiated in three ways:
(i) Free radical polymerization using peroxide as an initiator.
(ii) Cationic polymerization using H+ as an initiator.
(iii) Anionic polymerization using KNH2 as an initiator.
Free radical polymerization : In → In°.
Long Answer TypeWhy is cationic polymerization preferred in case of vinylic monomers containing electron donating groups?
Short Answer TypeWill you prefer to polymerize acrylo-nitrile under anionic or cationic polymerization conditions? Explain your choice.
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