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Thermosetting materials

Thermosetting materials

A

Are cross-linked molecules

B

Soften on application of heat

C

Are solvent soluble

D

None of these

Thermosetting materials Correct Answer Are cross-linked molecules

Bissoy MCQ Team

Chemical Engineering
Chemical Process

Related Questions

Thermosetting plastic materials

A

Can be repeatedly melted

B

Is useful for melt casting

C

Can not be melted after forming

D

Is useful for spinning

Which of the following is a thermosetting polymer?

A

PVC

B

PTFE

C

Nylon

D

Polyesters

Which of the following is an example of thermosetting plastic?

A

Bakelite

B

PVC

C

Polyethylene

D

No option is correct.

The thermosetting plastic

A

Becomes rigid when moulded at suitable pressure and temperature

B

At 127°C to 177°C permanently set and further application of heat does not soften it

C

Chars at 343°C

D

All the above

__________ is a thermosetting plastic.

A

Polyvinyl chloride

B

Polythene

C

Bakelite

D

Teflon

__________ moulding is used for shaping of thermosetting plastics exclusively.

A

Compression

B

Injection

C

Transfer

D

Extrusion

Polymers are classified into four categories namely thermosetting, thermoplastic, elastomer and fibre depending upon their

A

Molecular sizes

B

Magnitude of intermolecular forces

C

Resistance to heat

D

Polymerisation mechanism

Thermosetting resins/polymers as compared to thermoplastic ones are

A

Soluble in all organic solvents

B

More brittle

C

Formed by addition polymerisation only

D

Easily reshaped & reused

Thermosetting polymers as compared to thermoplastic polymers

A

Are formed by addition polymerisation

B

Have three dimensional structure

C

Have linear structure

D

None of these

While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous or crystalline. The crystalline polymers are characterised by the

A

Low impact strength

B

High flexibility

C

Better finish and surface appearance

D

High plastic deformation

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