Which of the following is not an elastomer ?
Which of the following is not an elastomer ?
A. Polyisoprene
B. Neoprene
C. Nitrile-butadiene
D. None of these
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Phosphates (e.g., tricresyl, tributyl, tetrabutyl, triphenyl etc.) are added to polymers to act as __________________?
Phosphates (e.g., tricresyl, tributyl, tetrabutyl, triphenyl etc.) are added to polymers to act as __________________?A. Hardeners
B. Anti-shrinkage agents
C. Plasticisers
D. Transparency improverSBR is produced by the copolymerisation of butadiene & styrene by employing emulsion polymerisation. The weight ratio of styrene and butadiene is maintained at_________________?
SBR is produced by the copolymerisation of butadiene & styrene by employing emulsion polymerisation. The weight ratio of styrene and butadiene is maintained at_________________?A. 1: 3
B. 3 : 1
C. 1 : 2
D. 2 : 1Plastic tubes & pipes are generally made by ______________ moulding?
Plastic tubes & pipes are generally made by ______________ moulding?A. Injection
B. Transfer
C. Extrusion
D. CompressionThe only natural thermoplastic resin, which is a product of animal life is ____________________?
The only natural thermoplastic resin, which is a product of animal life is ____________________?A. Rosin
B. Shellac
C. Amber
D. CopalVulcanisation of rubber_____________________?
Vulcanisation of rubber_____________________?A. Decreases its tensile strength
B. Increases its ozone & oxygen reactivity
C. Increases its oil & solvent resistance
D. Converts its plasticity into elasticityNylon-6 is a_________________?
Nylon-6 is a_________________?A. Polyamide
B. Thermosetting resin
C. Polyester
D. None of these