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.Management Sciences
Category: Polymer Technology
Cation exchange resins (0.3 to 1 mm size) used in water treatment is prepared from ______________ resins?
A. Epoxy
B. Phenol formaldehyde
C. Urea formaldehyde
D. Melamine formaldehyde
Which of the following is not an elastomer ?
A. Polyisoprene
B. Neoprene
C. Nitrile-butadiene
D. None of these
Melamine formaldehyde resin which has a very high anti tacking properties, is not used for the ___________________?
A. Electrical insulation purpose
B. Tanning of leather
C. Strengthening of plaster of Paris
D. Decorative laminates
A chain growth polymerisation reaction consists of three different types of reaction namely initiation reaction, propagation reaction & termination reaction. Chain growth polymerisation reaction is not involved in the manufacture of_______________________?
A. Siloxane elastomers
B. Polyamides
C. Vinyl polymers
D. Urea-formaldehyde resins
Styrene butadiene rubber (SBR) as compared to natural rubber has_______________?
A. Poor tensile strength
B. Poorer resistance
C. Greater amount of heat build up heavy loading
D. All A., B. and C.
Typical solvent polymerisation reaction conditions for the production of high density polythene by Zeigler process is__________________?
A. 7 kgf/cm2 and 70 °C
B. 1000 kgf/cm2 and 100°C
C. 7 kgf/cm2 and 700°C
D. 1 kgf/cm2 (gage) and 70°C
____________ polymer is used for making unbreakable crockery?
A. Thermoplastic
B. Melamine
C. Addition
D. None of these
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