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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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