A. Are cross-linked molecules
B. Soften on application of heat
C. Are solvent soluble
D. None of these
Related Mcqs:
- 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 - All thermoplastic, thermosetting & elastic materials can be processed in a extrusion machine, however it cannot be used for the production of plastic_______________?
A. Filaments
B. Pipes
C. Buckets
D. Tubings - _____________ moulding is used for shaping of thermosetting plastics exclusively?
A. Compression
B. Injection
C. Transfer
D. Extrusion - _____________ is a thermosetting plastic ?
A. PVC
B. Polythene
C. Bakelite
D. Polystyrene - 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 - 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
Answer: Option B - Thermosetting plastic materials___________________?
A. Can be repeatedly melted
B. Is useful for melt casting
C. Cannot be melted after forming
D. Is useful for spinning - Tyres are made by___________________?
A. Injection moulding
B. Extrusion
C. Rotational moulding
D. Compression moulding - Condensation polymerisation of _____________ produces Bakelite?
A. Propylene
B. Phenol & formaldehyde
C. Phenol & acetaldehyde
D. Urea & formaldehyde - Vulcanisation of rubber decreases its__________________?
A. Tensile strength
B. Resistance to organic solvents
C. Tackiness
D. Working temperature range
