polymers and composite

What is the main difference between thermoplastics and thermosets when exposed to heat?

• Thermoplastics remain solid, while thermosets melt.

• Thermoplastics melt, while thermosets remain solid.

• Both thermoplastics and thermosets melt.

• Both thermoplastics and thermosets remain solid.

What type of materials are both thermosets and thermoplastics?

• Metals

• Ceramics

• Polymers

• Composites

What type of polymer softens when heated?

• Thermoplastic

• Thermosetting

• Elastomer

• Composite

Which type of polymer has strong covalent bonds between polymer chains?

• Thermoplastic

• Thermosetting

• Elastomer

• Composite

What is a characteristic of thermosetting polymers?

• Weak intermolecular forces

• No cross-links between chains

• Remains hard when heated

• Softens when heated

What is the term for the temperature at which thermoplastics become soft?

• Melting point

• Boiling point

• Glass transition temperature (Tg)

• Freezing point

Which processes are commonly used to shape thermoplastics?

• Casting and forging

• Injection-moulding and blow-moulding

• Welding and soldering

• Extrusion and rolling

What is a significant aspect of thermoplastics?

• They are biodegradable.

• They are non-reversible.

• They can undergo reheating and change shape.

• They are always transparent.

Which of the following is a common thermoplastic material?

• Polyethylene (PE)

• Steel

• Glass

• Wood

What are thermosets generally characterized by compared to thermoplastics?

• Softer and more flexible

• Harder and more rigid

• Easily softened by reheating

• Less resistant to heat