Properties of PTFE (Teflon)
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Questions and Answers

Which polymer has a higher density at 25ºC, amorphous or crystalline?

  • The text does not specify
  • Amorphous
  • Crystalline (correct)
  • Both have the same density
  • Polyethylene has limited applications at high temperatures due to:

  • Good thermal conductivity
  • Low Tm value (correct)
  • High Tg value
  • High Tm value
  • Which polymer has good resistance to fatigue among the two discussed?

  • Both have the same resistance
  • Neither of them have resistance to fatigue
  • Polyethylene
  • Polypropylene (correct)
  • 'Tg' in polypropylene is at what temperature?

    <p>-10ºC</p> Signup and view all the answers

    What is one of the main advantages of PTFE mentioned in the text?

    <p>Low coefficient of friction</p> Signup and view all the answers

    At what temperature does PTFE maintain good flexibility according to the text?

    <p>-79°C</p> Signup and view all the answers

    What is the main disadvantage of PTFE mentioned in the text?

    <p>Easily melts when heated</p> Signup and view all the answers

    Which property makes PTFE very non-reactive according to the text?

    <p>Weak carbon-fluorine bonds</p> Signup and view all the answers

    What makes high-density polyethylene unsuitable for autoclaving conditions?

    <p>It has a higher density than polypropylene</p> Signup and view all the answers

    Which type of polyethylene has a high degree of short and long chain branching?

    <p>Low-density polyethylene (LDPE)</p> Signup and view all the answers

    Which type of polyethylene has good resistance to aldehydes, ketones, and vegetable oils?

    <p>Low-density polyethylene (LDPE)</p> Signup and view all the answers

    Which type of polyethylene is recommended for use with halogenated hydrocarbons?

    <p>Polypropylene</p> Signup and view all the answers

    Who synthesized the first nylon, nylon 66?

    <p>Wallace Hume Carothers</p> Signup and view all the answers

    When was nylon first used commercially in a nylon-bristled toothbrush?

    <p>1938</p> Signup and view all the answers

    During which event were women's stockings or 'nylons' first shown and became an instant commercial success?

    <p>New York World's Fair</p> Signup and view all the answers

    What is the IUPAC name for nylon 6,6?

    <p>Hexane-1,6 diamine</p> Signup and view all the answers

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