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Chemistry 1- Polymers and Ethanol (Polymers- many applications- difficult…
Chemistry 1- Polymers and Ethanol
Polymers- many applications- difficult to dispose of
Alkenes can be used to make polymers
Polymers- very large molecules made when joining smaller molecules (monomers) end to end
Alkenes act as monomers due to unsaturation (double bond)
Ethene polymerise to form polythene etc
Polymer molecules very big compared to other molecules
Repeating unit used in display formula
When drawing: start with monomer- change double bond in monomer to single in repeating unit- add bond to each end of repeating unit
Polymer
Monomer
Polymers- different properties-different uses
Polythene- used for plastic bags+bottles
Polypropene- used for crates+ropes
Polychloroethene- used for water pumps+ insulation of electricity cables
Polymers properties depend on chemicals used and conditions in which they are made
Two types of poly(ethene): LDPE- Low density poly(ethene) and HDPE- high density polythene
LDPE- weaker than HDPE and becomes softer at lower temperatures
Modern polymers many uses: packaging materials, fillings for teeth, waterproof coatings for fabrics, dressings for cuts, hydrogels, smart materials etc
Useful property of polymers- unreactive- suitable for storing food and chemicals safley
