This set of Chemical Industry Multiple Choice Questions & Answers (MCQs) focuses on “Polymerization – Composite Materials”.
1. Composite materials are a plastic matrix.
a) True
b) False
View Answer
Explanation: Composite materials are reinforced plastics in which a strong ceramic or other fibre is positioned in a plastic matrix. The original material in this category was glass fibre reinforced resins.
2. How is carbon fibre manufactured?
a) Heating
b) Thermal degradation of PAN
c) Cooling of PAN
d) Thermal degradation of polyethylene
View Answer
Explanation: Industrial manufacture of carbon fibre is based on the thermal degradation of non-melting organic polymers such as polyacrylonitrile (PAN). Mechanical properties attainable with carbon fibres is dependent upon the crystallinity.
3. Asbestos is used in reinforcing fibre.
a) True
b) False
View Answer
Explanation: The carcinogenic properties of fine asbestos fibres have decreased its use. It causes serious health hazards. So, it is not used in reinforcing fibre.
4. What are the sequence of steps involved in the manufacture of carbon fibre?
a) Cooling-Carbonization-Graphitization
b) Graphitization-Carbonization-Cooling
c) Heating-Carbonization-Graphitization
d) Graphitization-Carbonization-Heating
View Answer
Explanation: The PAN fibres are first preheated to 300°C and the undergoes carbonization at 1600°C till a high strength carbon fibre is formed. Finally, it undergoes graphitization at temperature up to 3000°C.
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