Which of the following is a thermoplastic?

Question

Question

This question was previously asked in

BPSC AE Paper 6 (Mechanical) 2019 Official Paper

Answer 1

Explanation:

Thermoplastics:

Thermoplastics are defined as polymers that can be melted and recast almost indefinitely.
They are molten when heated and harden upon cooling.
When frozen, however, thermoplastic becomes glass-like and subject to fracture.
These characteristics, which lend the material its name, are reversible, so the material can be reheated, reshaped, and frozen repeatedly. As a result, thermoplastics are mechanically recyclable.
Some of the most common types of thermoplastic are polypropylene, polyethylene, polyvinylchloride, polystyrene, Polyethylenetheraphthalate (PET), Teflon, Nylon, and polycarbonate.

Additional Information

Thermosetting plastic.

The plastic which keeps its shape and does not soften i.e the plastic which when molded once, can not be softened by heating is called Thermosetting plastic.
Thermosetting plastics are synthesized by condensation polymerization and have primary bonds between molecular chains and held together by strong cross-links.
Thermosetting plastics have a high melting point and tensile strength as compared to thermoplastics.
one of the most common types of thermoplastic are Bakelite, Melamine, Polyesters etc.