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.Management Sciences
Category: Polymer Technology
Addition polymerisation takes place either by a free radical mechanism or ionic mechanism depending on the reagents used. Free radical polymerisation is catalyzed by _______________, which decompose to give free radicals?
A. Organic peroxides
B. Sulphuric acid
C. Hydrofluoric acid
D. None of these
Perspex can be used as a substitute of glass. Its monomer is__________________?
A. Methyl methacrylate
B. DMT
C. Butadiene
D. Tetrafluoroethylene
_______________ is normally used for the manufacture of refrigerator components and transistor parts?
A. Polypropylene
B. Polystyrene
C. Polyester
D. Polyurethane
In step growth polymerisation, generally only one type of reaction & some basic mechanism is involved. Step growth polymerisation reaction is not involved in the manufacture of__________________?
A. Cross linked polystyrene
B. Phenol formaldehyde resins
C. Polyesters
D. Polyamides
Low pressure Zeigler process of polythene manufacture____________________?
A. Employs a pressure of 30 kgf/cm2
B. Achieves an yield of 95-98% based on ethylene
C. Produces very low density polythene
D. Does not use any catalyst for polymerisation
Condensation polymerisation of caprolactam is carried out in the reactor maintained at a temperature of __________ °C for producing nylon-6?
A. -20 to 25
B. 50 to 75
C. 100 to 150
D. 250-280
Polymerisation of poly functional monomers produces polymers having_________________?
A. Good mechanical strength
B. Low viscosity
C. Low melting point
D. None of these
Which of the following polymers shows the highest anti-tacking properties ?
A. Melamine formaldehyde resin
B. Phenolic resin
C. Epoxy resin
D. Alkyd resin
Branched chain polymers compared to linear polymers have higher ____________________?
A. Density
B. Tensile strength
C. Melting point
D. Degree of irregularity in atomic packing
Styrene butadiene rubber (SBR) is never used for making__________________?
A. Coated fabrics
B. Front wheel tyres of aeroplanes (i.e., heavy duty tyres)
C. Gaskets
D. Soles of shoes
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