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.Management Sciences
Category: Polymer Technology
Which of the following is stretched into fibers ?
A. Saturated polyester
B. Unsaturated polyester
C. Isoprene
D. Bakelite
Addition of stabiliser during PVC manufacture is done to________________?
A. Improve its impact strength
B. Improve its elasticity
C. Reduce the melt viscosity & glass transition temperature
D. Prevent its thermal degradation
Due to its excellent permeability to air/gas and oxidation resistance, the tubes of automobile tyres is made of________________?
A. Cold SBR
B. Butyl rubber
C. Bunai N
D. Buna S
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
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