Name: Molecular Masses of Polymers
Uploaded: 2019-07-19
Duration: 4 min 40 s
Description: We already know how to calculate the molecular mass of compounds. In this video, we will discuss the molecular masses of polymers and the methods to determin...

Question

What are synthetic rubbers? Explain the preparation and uses of the following:

(i) Neoprene (ii) Buna-N (iii) Buna-S

Accepted Answer

Synthetic rubber is any vulcanisable rubber like polymer, which is capable of getting stretched to twice its length. However, it returns to its original shape and size as soon as the external stretching force is released. Synthetic rubbers are either homopolymers of $1, 3 -$ butadiene derivatives or copolymers of $1, 3 -$ butadiene or its derivatives with another unsaturated monomer.

(i) Neoprene- Preparation and uses:

Preparation: Neoprene or polychloroprene is formed by the free radical polymerisation of chloroprene. That is,

Uses: Neoprene is used for manufacturing conveyor belts, gaskets and hoses.

(ii) Buna-N-Preparation and uses:

Preparation: Buna–N is obtained by the copolymerisation of $1, 3 -$ butadiene and acrylonitrile in the presence of a peroxide catalyst. The reaction can be given as,

Uses: Buna-N is used in making oil seals, tank lining, etc.

(iii) Buna-S: Preparation and uses:

Preparation: Buna-S is a copolymer obtained by the addition polymerisation of $1, 3 -$ butadiene and styrene. The chemical reaction can be given as,

Uses: Buna-S is used for making rubber soles, tank linings, protective gloves etc.

What are synthetic rubbers? Explain the preparation and uses of the following:

(i) Neoprene (ii) Buna-N (iii) Buna-S

Important Questions on Polymers

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