using resources Flashcards
what are ceramics
non metal
high meting point that arent made from carbon based compounds
can be made of clay
clay is a soft materia when it is dugg out of the ground and can be molded into different shapes
when fired at high temperature , it can harden to be clay ceramic
glass
generally transparent
can be moulded when hot
can be brittle when weak
most glass is made from soda line glass which is made by hitting a mixture of limestone sand and sodium carbonates until the melts when the mixture cools it comes out as Glass
boroilicate glass has a higher melting point than soda lime glass it is made the same way using a mixture of sand and boron trioxide
What is the properties of polymers depend on
What monomer they are made from and the conditions under which they are made
Thermos softening polymers do when they’re heated
The melts
What do thermosetting polymers do when they’re heated
They do not melt
Examples of clay ceramics
Pottery and bricks which are made by shaping with clear and then heating in a furnace
Low density polymers
Do a density polyethene is made from ethene at a moderate temperature under high pressure it is flexible and useful bags and bottles
High density polyethene
High density polyethene n is also made from ethene but as a lower temperature and pressure with a catalyst it is more rigid and is used for water tanks and drain pipes
themo softening polymers
Thermos softening polymers contain individual polymer chains and entwined together with weak forces between the chain
you can melt these plastics and remould them
Thermal setting polymers
Thermo setting polymers contain monomers that can form crosslinks between the polymer chains holding the chains together in a solid structure
they don’t soften when heated
they are strong card and rigid
Composites
Composite are made from one material embedded in another
fibres or fragments of a material are surrounded by a matrix acting as a binder
the properties of composite depends on the properties of the material is being made from
Examples of composites
Fiberglass consist of fibres of glass embedded in a Matrix made of polymer
it has a low density but it’s very strong and it’s useful stuff like boats and surfboards and skis.
carbon fiber composites also have a polymer matrix durian enforcement is either made from long chains of carbon atoms bonded together or from carbon nano tubes these compost sites are very strong and light so you can be used in aerospace and sports car manufacturing
wood is a natural composite of cellulose fibers how to get a van organic polymer Matrix
concrete is made from aggregate embedded in cement it is vey strong and ideal as a building material
Bronze
An alloy of copper and tin
Used for medals and statues
Brass
And allot of copper and zinc
More malleable than bronze
Used in water taps and door fittings
Gold
Pure gold is very soft.
Metals such as zinc copper and silver are used to harden the gold.
Jewellery
