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Questions and Answers
Which polymer has a higher density at 25ºC, amorphous or crystalline?
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:
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?
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?
'Tg' in polypropylene is at what temperature?
What is one of the main advantages of PTFE mentioned in the text?
What is one of the main advantages of PTFE mentioned in the text?
At what temperature does PTFE maintain good flexibility according to the text?
At what temperature does PTFE maintain good flexibility according to the text?
What is the main disadvantage of PTFE mentioned in the text?
What is the main disadvantage of PTFE mentioned in the text?
Which property makes PTFE very non-reactive according to the text?
Which property makes PTFE very non-reactive according to the text?
What makes high-density polyethylene unsuitable for autoclaving conditions?
What makes high-density polyethylene unsuitable for autoclaving conditions?
Which type of polyethylene has a high degree of short and long chain branching?
Which type of polyethylene has a high degree of short and long chain branching?
Which type of polyethylene has good resistance to aldehydes, ketones, and vegetable oils?
Which type of polyethylene has good resistance to aldehydes, ketones, and vegetable oils?
Which type of polyethylene is recommended for use with halogenated hydrocarbons?
Which type of polyethylene is recommended for use with halogenated hydrocarbons?
Who synthesized the first nylon, nylon 66?
Who synthesized the first nylon, nylon 66?
When was nylon first used commercially in a nylon-bristled toothbrush?
When was nylon first used commercially in a nylon-bristled toothbrush?
During which event were women's stockings or 'nylons' first shown and became an instant commercial success?
During which event were women's stockings or 'nylons' first shown and became an instant commercial success?
What is the IUPAC name for nylon 6,6?
What is the IUPAC name for nylon 6,6?
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