This section contains multiple choice questions. Each...

This section contains multiple choice questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONLY ONE is correct.
Polyurethane is a polymerisation product of ethylene glycol and
(a) vinyl chloride
(b) terephthalic acid
(c) acrylonitrile
(d) toluene- 2,4 -diisocyanate

Key Concepts

Isocyanates

Isocyanates are reactive chemical compounds that contain the functional group -NCO. They are essential in the production of polyurethanes because they react with the hydroxyl groups of polyols to form urethane linkages. Their high reactivity allows for controlled polymerisation reactions that lead to the formation of complex polymer structures.

Polyols

Polyols are compounds with multiple hydroxyl (-OH) groups and serve as key building blocks in the manufacture of polyurethanes. When combined with isocyanates, polyols undergo a polymerisation process that creates urethane bonds, enabling the formation of customized polymeric materials with desirable mechanical and chemical properties.

Polymerisation

Polymerisation is the chemical process where small molecules, called monomers, join together to form a larger, chain-like structure known as a polymer. This reaction can occur through various mechanisms, such as step-growth or chain-growth polymerisation, and is fundamental in the creation of many synthetic and natural materials.

Polyurethanes

Polyurethanes are a versatile class of polymers that are created by reacting polyols, which contain multiple hydroxyl groups, with isocyanates. This reaction forms urethane linkages in a step-growth polymerisation process, resulting in materials with a wide range of properties, from flexible foams to rigid plastics, used in various industrial applications.

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