Multiple choice

Which of the following statement(s) is/are false?

  1. Vectran is an aromatic polyester and is used for reinforcing fibres for ropes and sailcloth.
  2. HDPE has larger strength than that of LDPE.
  3. PET fibers are manufactured under the trade names of Teflon.

  1. Only 1

  2. Only 2

  3. Only 3

  4. 1 and 2

  5. 2 and 3
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  1. Vectran is an aromatic polyester used for reinforcing fibres for ropes and sailcloth. It is also used in manufacturing badminton strings, bike tires and in electronics applications.
    1. HDPE is known for its large strength to density ratio. The density of high-density polyethylene can range from 0.93 to 0.97 g/cm3. Although the density of HDPE is only marginally higher than that of low-density polyethylene, HDPE has little branching, giving it stronger intermolecular forces and tensile strength than LDPE.
    2. Polyethylene terephthalate (PET) or polyethylene terephthalic ester (PETE) is a condensation polymer produced from the monomers ethylene glycol, (a dialcohol) and dimethyl terephthalate (a diester). PET fibers are manufactured under the trade names of Dacron. Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer of tetrafluoroethylene that has numerous applications. The best known brand name of PTFE is Teflon by DuPont Co. Hence, statement 2 is false.

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