Question

define thermosetting plastic​

Answer 1

Answer:

hope it will help you..

Explanation:

A thermosetting polymer, often called a thermoset, is a polymer that is obtained from irreversibly hardening by curing from a soft solid or viscous liquid prepolymer (resin). Curing is induced by heat or suitable radiation and may be promoted by high pressure, or mixing with a catalyst.

Answer 2

Answer:

Thermosetting plastics are the type of plastics which when moulded once, cannot be remoulded on heating. For example, Bakelite and Melamine.

Explanation:

Thermosetting plastics differ from thermoplastics which can be remoulded on heating again and again. For example, polythene and polyvinyl chloride (commonly known as PVC).

This is because the molecular structures of the polymers ( from which the plastics are made of ) in both cases are different.

In case of thermosetting plastics, the structure is cross linked. This means that there are diagonal, vertical and horizontal connections between the monomers ( which join together to give rise to polymers). This prevents sliding of monomers over one another upon heating and hence the plastic cannot be remoulded.

In case of thermoplastics or thermosoftening plastics, the structure is linear. This means that the connections between the monomers can only be horizontal or vertical. This allows the sliding of monomers over one another upon heating and hence the plastic can be remoulded again and again.

Hope this helps you !!!! :-)