Q20 of 40 Page 1

Write the structures of the monomers used for getting the following polymers:

(a) Teflon


(b) Melamine-formaldehyde polymer


(c) Neoprene

(a) Teflon [PTFE] – Tertrafluoroethene [nF2C = CF2] is the monomer of Teflon. Since it is heat resistant it is used for non-stick cook ware, gaskets etc. The polymer is formed by addition polymerization. The reaction is:


(b) The compounds used for this polymer are melamine and formaldehyde and melamine formaldehyde polymer or resin is formed by condensation polymerization. The polymer obtained is a thermosetting polymer and thus is used to make plastic crockery. The structure of these compounds are as follows:



(c) Neoprene – It is prepared by the free radical polymerization of chloroprene. It is used as insulator for making belts, gaskets, hoses etc. The reaction is follows:



More from this chapter

All 40 →
9

Using IUPAC norms write the formulae for the following:

(a) Potassium trioxalatoalumniate (III)


(b) Dichloridobis (ethane -1, 2-diamine) cobalt (III)

 14

(a) Based on the nature of intermolecular forces, classify the following solids:

Sodium Sulphate and Hydrogen


(b) What happens when CdCl2 is doped with AgCl?


(c) Why do ferromagnetic substances show better magnetism than antiferromagnetic substances?

 15

(a) Write the principle of electrolytic refining.

(b) Why does copper obtained in the extraction from copper pyrites have a blistered appearance?


(c) What is the role of depressants in the froth floatation process?

 19

Define the following:

(a) Cationic detergents


(b) Broad spectrum antibiotics


(c) Tranquilizers