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Chemical Engineering :: Polymer Technology

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Polymer Technology - Section 6

  1. In a linear polymer, the monomeric units are linked together to form long straight chains. The cross linked or branched chain polymers compared to linear polymers have higher

    2. A.
    densities
    B.
    melting point
    C.
    tensile strength
    D.
    hardness, rigidity & brittleness

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  2. Vulcanisation of rubber does not increase its

    3. A.
    softness
    B.
    oxidation resistance
    C.
    weight & strength
    D.
    elasticity & water solubility

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  3. Which of the following is a copolymer ?

    4. A.
    Polystyrene
    B.
    SBR
    C.
    P.T.F.E.
    D.
    Polypropylene

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  4. Styrene butadiene rubber (SBR) is never used for making

    5. A.
    coated fabrics
    B.
    front wheel tyres of aeroplanes (i.e., heavy duty tyres)
    C.
    gaskets
    D.
    soles of shoes

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  5. Cross linked polymers are

    6. A.
    thermoplastic
    B.
    thermosetting
    C.
    either (a) or (b)
    D.
    fibres only

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  6. Silicone resins, which are highly water repellant and has good heat resistance can not be used

    7. A.
    as room temperature adhesive.
    B.
    as grease & lubricant.
    C.
    hydraulic fluid for heat transfer.
    D.
    resin for lamination.

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  7. Pick out the wrong statement.

    8. A.
    Addition polymers are generally formed by chain growth polymerisation.
    B.
    Condensation polymers are generally formed by step growth polymerisation.
    C.
    Teflon is formed by step growth polymerisation.
    D.
    Bakelite is formed by step growth polymerisation.

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  8. Which of the following rubbers has the widest service temperature range (-75 to 275°C) ?

    9. A.
    Butyl rubber
    B.
    Silicon rubber
    C.
    Nitrile rubber
    D.
    Silicone rubber

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  9. Nylon-66 compared to nylon-6 has

    10. A.
    lower melting point.
    B.
    more abrasion resistant properties.
    C.
    higher hardness.
    D.
    all (a), (b) and (c).

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  10. Scouring is a finishing operation during the manufacture of fibre, which aims at __________ of fibres.

    11. A.
    improving the stretchability
    B.
    dyeing/colouring
    C.
    detergent solution washing
    D.
    glycol soaking

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