Thermoplastic resins are those polymers, which

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 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

Thermoplastic resins usually

A

Remain hard as long as they are hot

B

Can not be reclaimed from waste

C

Permanent setting resins

D

Less brittle than thermosetting resins

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

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

Epoxy resins (i.e., epoxide polymers)

A

Are made by addition polymerisation reaction only

B

Contain an epoxy group ( ##### ) at the ends of the polymer

C

Are cross-linked polymers only

D

Use emulsion polymerisation methods

Thermoplastic materials are those materials which

A

Do not become hard with the application of heat and pressure and no chemical change occurs

B

Are flexible and can withstand considerable wear under suitable conditions

C

Are formed into shape under heat and pressure and results in a permanently hard product

D

Are used as a friction lining for clutches and brakes

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

Thermoplastic resins are those polymers, which

Related Questions