Polymers.

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Presentation transcript:

Polymers

What are polymers?

What do we make polymers from?

What are the different types of polymer?

http://bpes.bp.com/secondary- resources/science/ages-14-to-16/chemical-and- material-behaviour/polymerisation/

Polymers (Greek) poly = “many” meros = “part” Each polymer molecule is made from a repeating unit: a monomer Monomers are small molecules (not single atoms). polymerisation monomers Single polymer chain

Size and shape matter Polymer chains are like long bits of string. The polymer’s properties depend on many factors: length of chains type of monomer(s) side-links and branches temperature time taken for polymer to cool down other chemicals present

Arrangement of the chains The length of the chain can be controlled. The chains are thousands or millions of units long. DNA: a very complex polymer up to 220 million units long.

Chain length They twist and bend and tangle with each other, but can also line up neatly. Chains aligned (crystalline) Chains entangled (amorphous)

Branching and cross-linking Sometimes they can have branches, or they can be linked to other chains. Different types of branching Cross-linked chains

Which of the following molecules could be used as monomers Which of the following molecules could be used as monomers? Explain your answer. A B C

Thermoplastic or thermosetting plastic? The solid lines represent covalent bonds. A thermosoftening plastic: A thermosetting plastic: Note: Polyethene is a thermoplastic plastic. Bakelite is a thermosetting plastic. Use the diagrams to explain the following observations. Polyethene is flexible Bakelite is rigid Polyethene melts when heated. Bakelite does not melt when heated Use Thermoplastic or thermosetting plastic? Ash tray Carrier bag Electric plug Packaging

Making slime PVA is a polymer We add borax which forms the borate ion in solution

The chemistry of slime What has happened to the PVA? How has the structure changed?

Polymers Putting all the information you know together, make a double spread page about polymers. Use connectives to improve the quality of writing and make your point.