Question
Write reactions involved in the formation of Bakelite
✓
Answer
The monomers phenol and formaldehyde undergo polymerisation in the presence of alkali or acid as catalyst.
Phenol reacts with formaldehyde to form ortho or p-hydroxy methyl phenols, which further reacts with phenol to form a linear polymer called Novolac. It is used in paints.
In the third stage, various articles are shaped from novolac by putting it in appropriate moulds and heating at high temperature (138 °C to 176 °C) and at high pressure forms rigid polymeric material called bakelite. Bakelite is insoluble and infusible and has high tensile strength.
Bakelite is used in making articles like telephone instrument, kitchenware, electric insulators frying pans, etc.
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