Thursday, March 15, 2012

Uses of plastics

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There are many types of plastics. For example


Name Used for


Polythene Plastic bags and bottles, dustbins, ecling filmf


Cheap University Papers on Uses of plastics




Polystyrene Plastic cups, fats-food cartons, packaging foam


Nylon Rope, bristle for brushes, tights, carpet


Melamine eUnbreakablef dishes and mugs, ashtrays


Urea-formaldehyde Electric plugs and switches


Phenol-formaldehyde Door handles, saucepan handles


Plastics have these properties


1) They are all carbon compounds.


) Their molecules are long chains of atoms, made by joining lots of small molecules together. So they are called polymers. Poly means many. They are produced by a reaction called polymerization.


) Because they are molecular compounds, they do not conduct electricity. They are electrical and thermal insulators.


4) They are unreactive. Most are not affected by water, or oxygen, or other chemicals, which makes them very useful. But it also means they are difficult to dispose of. Unlike wood or paper, they do not rot away. (But biodegradable plastics will rot away.)


5) Some catch fire easily. When they burn, they may give out harmful gases. For example, PVC gives out choking fumes of hydrogen chloride when it burns.


6) Plastics contain mainly carbon and hydrogen atoms, which are light. So plastics are also light. But they are also strong because their molecules are so long. The longer the molecules, the larger the force of attraction between them.


(As you will see on the next page, the molecules in some plastics are cross-linked, which makes them even stronger.)


Plastics have these properties


7) They are all carbon compounds.


8) Their molecules are long chains of atoms, made by joining lots of small molecules together. So they are called polymers. Poly means many. They are produced by a reaction called polymerization.


) Because they are molecular compounds, they do not conduct electricity. They are electrical and thermal insulators.


10) They are unreactive. Most are not affected by water, or oxygen, or other chemicals, which makes them very useful. But it also means they are difficult to dispose of. Unlike wood or paper, they do not rot away. (But biodegradable plastics will rot away.)


11) Some catch fire easily. When they burn, they may give out harmful gases. For example, PVC gives out choking fumes of hydrogen chloride when it burns.


1) Plastics contain mainly carbon and hydrogen atoms, which are light. So plastics are also light. But they are also strong because their molecules are so long. The longer the molecules, the larger the force of attraction between them.


(As you will see on the next page, the molecules in some plastics are cross-linked, which makes them even stronger.)








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