Thermoplastics vs Thermosetting Plastics

What is a key characteristic of thermoplastics?

• They cannot be reshaped once molded

• They can be repeatedly melted and reshaped

• They are very brittle

• They decompose at low temperatures

Which of the following describes thermosetting plastics?

• They soften when heated and can be reshaped

• They harden permanently after curing

• They are used primarily in low-temperature applications

• They are easily recyclable

Which of the following is an example of a thermoplastic?

• Polyethylene

• Bakelite

• Melamine

• Urea-formaldehyde

Which plastic would be best for applications requiring high heat resistance?

• Polyethylene

• Polystyrene

• Bakelite

• Polyvinyl chloride (PVC)

What is the main advantage of thermoplastics in manufacturing?

• They can be recycled and remolded

• They resist melting at high temperatures

• They are very rigid

• They form permanent bonds when heated

Which of the following is a thermosetting plastic?

• Polypropylene

• Nylon

• Epoxy resin

• Polyethylene

Which characteristic is typical of thermosetting plastics?

• They can be melted and reformed multiple times

• They decompose upon heating instead of melting

• They are usually soft and flexible

• They dissolve in water

What type of polymerization typically forms thermosetting plastics?

• Addition polymerization

• Condensation polymerization

• Copolymerization

• Free-radical polymerization

Which of the following is an application of thermoplastics?

• Circuit boards

• Disposable containers

• Brake linings

• Electrical insulators

Which property makes thermosetting plastics ideal for electrical applications?

• High thermal conductivity

• High electrical conductivity

• Excellent insulation properties

• High flexibility