5.A] Explain the synthesis and application of Polyurethane.
Answer:-
Synthesis of Polyurethane:
Polyurethane often abbreviated PUR and PU refers to a class of polymers composed of organic units joined by urethane links. Polyurethanes are produced by the polymerization reaction of di-isocyanate and diol or triol (or the addition reaction between di-isocyanate with glycol). In the production of polyurethane foams, glycol, di-isocyanate, catalyst (tertiary amines), water and surfactants are mixed together and heated.
Application of Polyurethane:-
- Flexible foams are used for cushions in automobiles & furniture
- Rigid foams are used to reinforce hallow structural units.
- Fibers of Polyurethanes are used in lightweight garments and swimsuits because of their stretching property
- These are used to coat the gymnasium floor and dance floor
- These are used in tyre treads and industrial wheels.