Polymers and Nanotechnology Flashcards
What can ninitol be used for?
- Dental braces
2. Glasses frames
What is ninitol?
A shape memory alloy.
What is ninitol made of?
Half nickel and half titanium.
How big are nanoparticles?
1-100 nanometres across.
How many atoms do nanoparticles contain?
A few hundred atoms.
What are fullerenes shaped like?
Hollow balls or closed tubes.
How are carbon atoms arranged in fullerenes?
Hexagonal rings.
What are nanotubes?
Fullerenes joined together in hollow tubes.
Why are carbon nanotubes strong?
Lots of covalent bonds.
Why are nanoparticles useful as industrial catalysts?
Huge surface area to volume ratio.
Why are nanoparticles good sensors?
They only detect one type of molecule.
What kind of building materials do nanotubes make?
- Stronger
2. Lighter
Why are nanoparticles good for cosmetics?
They don’t leave white marks.
What is nanomedicine?
The idea that tiny fullerenes are absorbed more easily by the body than most particles.
Why would nanoparticles be good as medicines?
They deliver drugs right into the cells where they’re needed.
Where can fullerene lubricant coatings be used?
Artifical joints and gears.
Why can nanotubes be used in tiny electric circuits?
They conduct electricity.
What are thermosoftening polymers?
Polymers that can be melted and remoulded.
Why can thermosoftening plastics be melted easily?
They don’t have crosslinks between chains.
What are thermosetting polymers?
Strong polymers that don’t soften when heated.
Why don’t thermosetting polymers melt?
They have crosslinks that hold the structure together.
What are the two types of polythene?
- Low density
2. High density
How is LD polythene made?
- 200C
2. High pressure
What is LD polythene used for?
Bags and bottles.
