Polymers Flashcards
What do forces between molecules determine?
The properties of plastics.
What do strong covalent bonds hold?
The atoms together in long chains.
Describe weak forces?
Individual tangled chains of polymers.
Held together by weak inermolecular forces.
In weak forces individual tangled chains are free to do what?
Slide over each other.
Name a weak polymer?
Thermosoftening polymer.
Thermosoftening don’t have what?
Cross-linking between chains.
In thermosoftening the chains are really easy to overcome this means?
Its really easy to melt the plastic.
When the thermosoftening cools what happens?
Polymer hardens into new shape.
Describe strong forces?
Some plastics have stronger intermoleular forces between polymer chains called crosslinks.
What do crosslinks do?
Hold the chains firmly together.
In solid structures.
Name a hard polymer?
Thermosetting polymers.
Thermosetting polymers have what?
Crosslinks
Thermosetting polymers don’t do what?
Soften when heated.
Describe thermosetting polymers in 3 word.
Strong.
Hard.
Rigid.
How you make a polymer affects its…
Properties.
