Thermosetting Plastics, Particle Reinforced Composites Sans

Thermosetting plastics are formed by

• addition polymerization

• copolymerization

• condensation polymerization

• isomerism

Which of the following is a property of thermosetting plastics?

• can be molded

• soft

• recyclable

• can be used at high temperature

Which among these is an example of a commodity thermosetting plastic polymer material?

• polyethylene

• polypropylene

• polystyrene

• phenolic

Which of the following is not an example of a thermoplastic polymer?

• urethane

• melamine

• epoxide

• acetal

Phenolics are otherwise commonly known

• bakelite

• polyformaldehyde

• urea formaldehyde

• melamine formaldehyde

Polyformaldehyde has a good stability up to

• 50^oC

• 100^oC

• 150^oC

• 250^oC

Melamine formaldehyde can be used at temperatures up

• 65^oC

• 95^oC

• 150^oC

• 240^oC

Which plastic material does a combination of dibasic acids and polyhydric alcohols give?

• polyester

• polyurethane

• epoxide

• phenolic

A polymer having rubber-like properties is known

• thermoset

• thermoplastic

• elastomer

• polyisoprene

Which of the following is used as an adhesive?

• epoxide

• polyurethane

• polyester

• phenol formaldehyde