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  • Question
  • The rate controlling step in the manufacture of silicone rubber is the


  • Options
  • A. polymer termination step.
  • B. condensation of siloxane to silicone.
  • C. initial hydrolysis of silicone monomer.
  • D. none of these.

  • Correct Answer
  • initial hydrolysis of silicone monomer. 


  • Polymer Technology problems


    Search Results


    • 1. Acrylonitrile-butadiene-styrene (ABS) copolymer, which is produced by blending styrene-acrylonitfile copolymer with butadiene based elastomer, is a/an

    • Options
    • A. rigid foam
    • B. engineering plastic
    • C. thermosetting polymer
    • D. spongy rubber
    • Discuss
    • 2. Orion is

    • Options
    • A. a copolymer.
    • B. a condensation polymer.
    • C. obtained by polymerising vinyl cyanide.
    • D. all (a), (b) and (c).
    • Discuss
    • 3. The repeating units of PTFE are

    • Options
    • A. Cl2CH-CH3
    • B. F2 C = CF2
    • C. F3 C-CF3
    • D. FClC = CF2
    • Discuss
    • 4. Thermocole (expanded polystyrene) is not used for

    • Options
    • A. low temperature thermal insulation as in refrigerator and air conditioners.
    • B. accoustic control and ceiling for building.
    • C. high temperature thermal insulation in furnaces.
    • D. packing of delicate electronic gadgets.
    • Discuss
    • 5. __________ polythene is most prone to stress-cracking

    • Options
    • A. High density
    • B. Low density
    • C. Cross-linked
    • D. Linear low density
    • Discuss
    • 6. Starting material for the production of butadiene in India is

    • Options
    • A. naphthalene
    • B. benzol
    • C. ethyl alcohol
    • D. phthalic anhydride
    • Discuss
    • 7. __________ moulding is used for shaping of thermosetting plastics exclusively.

    • Options
    • A. Compression
    • B. Injection
    • C. Transfer
    • D. Extrusion
    • Discuss
    • 8. Liners of bags are usually made of

    • Options
    • A. polythene
    • B. PVC
    • C. polypropylene
    • D. polyesters
    • Discuss
    • 9. Pick out the wrong statement.

    • Options
    • A. For the manufacture of styrene, the major raw materials are benzene and ethylene.
    • B. One inportant copolymer of styrene is SBR, which is widely used in the manufacture of automobile tyres.
    • C. Manufacture of phenol by chloroben-zene-eaustic process involves. The chlorination of benzene, causticisation and hydrolysis.
    • D. Phenol manufacture by chlorobenzene-caustic process is competitive even when low cost chlorine is not available.
    • Discuss
    • 10. Which of the following is an elastomer?

    • Options
    • A. Thiokol
    • B. Phenol formaldehyde
    • C. Urea formaldehyde
    • D. Polystyrene
    • Discuss


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