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.Management Sciences
Category: Polymer Technology
Fillers such as zinc oxide and carbon black are added to the crude natural rubber before vulcanisation in order to improve its_________________?
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A. Elasticity
B. Strength
C. Plasticity
D. Weathering characteristics
Glyptal used in the manufacture of paints & lacquers is a _____________ polymer?
A. Polyamide
B. Polystyrene
C. Polyester
D. Polyacrylonitrile
Plexiglass (also called Lucite) because of its high optical transparency is used for making lenses. It is chemically_________________?
A. Polymethyl methacrylate (PMMA)
B. Polytetrafluroethylene (PTFE)
C. Polycarbonates
D. Phenolic resins
Phenol formaldehyde __________________?
A. Employs addition polymerisation
B. Employs condensation polymerisation
C. Is a monomer
D. Is an abrasive material
Condensation polymerisation of _____________ produces Bakelite?
A. Propylene
B. Phenol & formaldehyde
C. Phenol & acetaldehyde
D. Urea & formaldehyde
Plastic articles are normally produced by _____________ moulding?
A. Green sand
B. Injection
C. Shell
D. Dry sand
Melt spinning of polymers involves the forcing of polymer melt through spinnerates (fine holes) into an atmosphere kept at a temperature lower than the melting point of the polymer, which causes the fine diameter polymer melt to harden into filaments. Melt spinning is not used in case of the _____________ fibres?
A. Acrylic
B. Polyester
C. Nylon 6:6
D. Polypropylene
Which of the following is not a polymer of two monomers ?
A. Teflon
B. Bakelite
C. SBR
D. None of these
Vinyl flooring is done using _____________ sheets?
A. Polypropylene
B. PVC
C. Polythene
D. Polyvinyl acetate
Branched chair polymers as compared to linear polymers have _________________?
A. Higher melting point
B. Higher tensile strength
C. Lower density
D. None of these
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