16 Questions
Which polymer has a higher density at 25ºC, amorphous or crystalline?
Crystalline
Polyethylene has limited applications at high temperatures due to:
Low Tm value
Which polymer has good resistance to fatigue among the two discussed?
Polypropylene
'Tg' in polypropylene is at what temperature?
-10ºC
What is one of the main advantages of PTFE mentioned in the text?
Low coefficient of friction
At what temperature does PTFE maintain good flexibility according to the text?
-79°C
What is the main disadvantage of PTFE mentioned in the text?
Easily melts when heated
Which property makes PTFE very non-reactive according to the text?
Weak carbon-fluorine bonds
What makes high-density polyethylene unsuitable for autoclaving conditions?
It has a higher density than polypropylene
Which type of polyethylene has a high degree of short and long chain branching?
Low-density polyethylene (LDPE)
Which type of polyethylene has good resistance to aldehydes, ketones, and vegetable oils?
Low-density polyethylene (LDPE)
Which type of polyethylene is recommended for use with halogenated hydrocarbons?
Polypropylene
Who synthesized the first nylon, nylon 66?
Wallace Hume Carothers
When was nylon first used commercially in a nylon-bristled toothbrush?
1938
During which event were women's stockings or 'nylons' first shown and became an instant commercial success?
New York World's Fair
What is the IUPAC name for nylon 6,6?
Hexane-1,6 diamine
Explore the exceptional properties of PTFE (Polytetrafluoroethylene), including low friction coefficient, high strength, self-lubrication, chemical resistance, and non-stick characteristics. Learn about its applications and advantages.
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