Thermosetting polymers are

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

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

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 resins are those polymers, which

A

Do not increase in plasticity with rise in temperature

B

Allow slip to occur between molecules

C

Do not take on a permanent set

D

None of these

Branched chair polymers as compared to linear polymers have

A

Higher melting point

B

Higher tensile strength

C

Lower density

D

None of these

In a linear polymer, the monomeric units are linked together to form long straight chains. The cross linked or branched chain polymers compared to linear polymers have higher

A

Densities

B

Melting point

C

Tensile strength

D

Hardness, rigidity & brittleness

Branched chain polymers compared to linear polymers have higher

A

Density

B

Tensile strength

C

Melting point

D

Degree of irregularity in atomic packing

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.

Thermosetting polymers are

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