Question

Plastics which are capable of moulding only once

Answer 1

Answer:

Plastics are categorized into thermosoftening and thermosetting plastics.

In thermosoftening plastics, the forces between the polymer chains are weak, so they can easily be remoulded into new shapes. This makes it possible to recycle this type of plastic. whereas in thermosetting plastics there are strong covalent bonds forming cross-links between the polymer chains, making these plastics hard and rigid. Once set into its original shape, a thermosetting plastic can't be softened and remoulded. The strong bonds between polymers also mean that thermosetting plastics are much more heat resistant than thermosoftening ones.

Example: Melamine is an example of a thermosetting plastic and polythene is a thermosoftening plastic.

Answer 2

Plastics are capable of molding and casting into various shapes ... Once set into its original shape, a thermosetting plastic ...

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