Polymers Flashcards
what is a polymer ?
A polymer is a very high molecular weight molecule made by chemically linking many small molecules (monomers)
what is a polymer ?
A polymer is a very high molecular weight molecule made by chemically linking many small molecules (monomers)
Condensation Polymerisation
Involves the loss of a small molecule
Condensation Polymerisation
Involves the loss of a small molecule
Properties of Polymers
Depends on:
1. Monomer chemistry
2. Location, and ordering of monomers
3. Number of monomers (molecular weight)
Properties of Polymers
Depends on:
1. Monomer chemistry
2. Location, and ordering of monomers
3. Number of monomers (molecular weight)
Polymer Structures
- Polymer chains can be many different shapes and sizes
e.g graft, multivalent , dendrimer
Polymer Structures
- Polymer chains can be many different shapes and sizes
e.g graft, multivalent , dendrimer
Classification of Polymers
-
Thermoplastic: soften when heated
For example: Plastic bottles -
Thermoset: Hold shape when heated
For example: Frying pan handles Bakelite -
Elastomer: Stretch easily then return to original shape
Rubber
Disposal of Polymers
- biodegradable
- Natural polymers
- Aliphatic polyesters
- Polyvinyl alcohols
- non-biodegradable
what is Poly(ethylene terephthalate) PET ?
- A polyester
- Thermoset, and condensation polymer
- Easily manipulated, strong, and gas resistant
- Fabrics, food packaging, magnetic tapes, drinks bottles, etc.
what is Poly(ethylene terephthalate) PET ?
- A polyester
- Thermoset, and condensation polymer
- Easily manipulated, strong, and gas resistant
- Fabrics, food packaging, magnetic tapes, drinks bottles, etc.
Polymers we eat
Starch
Rice, potatoes, wheat
Grains, cereals, flour
Cellulose
Fruit skin, fibre,
Vegetables
Protein
Meat, fish, eggs
3 forms of starch
-
Amylose (1,4 linkage of glucose)
Linear chain -
Amylopectin (branches from C6)
Branches in chain -
Glycogen (smaller, more branched polymer)
Quick release of glucose for energy
