What is a thermoplastic?

What is a thermoplastic?

• A. A fiber
• B. A plastic that can be heated and shaped many times
• C. A metal
• D. A glass

Answer: (B)

Thermoplastics are plastics that soften when heated and can be melted, shaped, and then cooled to harden again. When heated, the polymer chains gain mobility and the material can flow, allowing it to be molded, extruded, or reshaped multiple times. On cooling, it solidifies again, so the process can be repeated. This reprocessability is a defining feature and is why thermoplastics are widely used in manufacturing and recycling. This differs from materials that harden permanently after forming, like many thermosetting plastics, which cannot be remelted. The other options describe forms or materials that aren’t the category in question, so they don’t fit as well.

Thermoplastics are plastics that soften when heated and can be melted, shaped, and then cooled to harden again. When heated, the polymer chains gain mobility and the material can flow, allowing it to be molded, extruded, or reshaped multiple times. On cooling, it solidifies again, so the process can be repeated. This reprocessability is a defining feature and is why thermoplastics are widely used in manufacturing and recycling.

This differs from materials that harden permanently after forming, like many thermosetting plastics, which cannot be remelted. The other options describe forms or materials that aren’t the category in question, so they don’t fit as well.