Polymer Technology Questions

• Natural rubber is obtained from latex, which is a colloidal dispersion of rubber in water. Which of the following is used as a coagulant in latex?
• Transistor parts and refrigerator components are normally made of
• 90% of the caprolactum is converted to nylon-6 on its condensation polymerisation in the reactor maintained at a temperature of __________ °C.
• Peptizers like aromatic mercaptans (e.g. thiophenes) are added in rubber to
• Due to its excellent permeability to air/gas and oxidation resistance, the tubes of automobile tyres is made of
• Automobile steering wheels are normally made of
• Orlan fibre which is used as a wool sub stitute is
• Visco-elastic behaviour exhibited by plastics is a __________ like behaviour.
• Cellulose is the main contituent of most __________ fibres.
• Mastication of rubber means
• Trade name of __________ is neoprene.
• Caprolactum, a raw material for the manufacture of nylon-6, is produced from
• Fillers such as zinc oxide and carbon black are added to the crude natural rubber before vulcanisation in order to improve its
• __________ tubes are good substitude for human blood vessels onrheart by-pass operation.
• Neoprene which is used for making shoe heels & belts is superior to natural rubber in its stability to aerial oxidation and resistance to oils & other solvents. The monomer used for making neoprene is
• Thiokol is nothing but
• Dacron is a/an
• Tubeless tyres are made of __________ rubber, which is a co-polymer of isoprene & isobutylene.
• SBR is produced by the copolymerisation of butadiene & styrene by employing emulsion polymerisation. The weight ratio of styrene and butadiene is maintained at
• The organic acid monomer in nylon 66 is