C2 Material Choices
material choices
- Created by: Georgiabot
- Created on: 16-06-14 20:55
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- C2 Material Choices
- Natural and Synthetic materials
- metals
- Ceramics
- Polymers
- All made up of chemicals
- atoms or groups of atoms bonded together
- Or a mixture of chemicals
- NATURAL
- wood
- cotton
- leather
- silk
- wool
- SYNTHETIC
- nylon
- polyester
- paints
- Materials, Properties and Uses
- uses depend on properties
- plastics are hard, stiff, strong, fairly low density and can be mouldable
- Rubber is strong but soft, flexible and mouldable
- Nylon fibres can be soft, flexible and strong
- PROPERTY
- melting point
- strength
- stiffness
- hardness
- density
- uses depend on properties
- Crude Oil
- Fossil Fuel
- a mixture of hydrocarbons
- hydrocarbon properties depend on chain length
- short chain
- gaseous - low boiling points
- long chain
- viscous - high boiling points
- short chain
- hydrocarbon properties depend on chain length
- a mixture of hydrocarbons
- Strong Covalent Bonds
- there are intermolecul-ar forces of attraction also
- refined by fractional distillation
- hydrocarbons separated by boiling point
- various uses
- petrochemical industry- fuels and lubricants
- can be used for medicine, plastics, fertilisers and even food
- the process of making new compounds is called CHEMICAL SYNTHESIS
- Fossil Fuel
- Polymerisation
- polymers form when lots of smaller molecules or monomers join together
- different polymers have different properties
- polymers can be the synthetic replacement for many traditional materials
- chain length
- short
- low melting point, flexible, stretch easily
- long
- higher melting points, stiffer, cannot be stretched
- short
- strength of forces
- strong
- higher melting points, stiffer, cannot be stretched
- weak
- low melting point, flexible, stretch easily
- strong
- crystallinity
- crystalline = hard, strong, high melting point
- not crystalline = weak, lower melting point and density
- Nanotechno-logy
- 1-100 nanometres across - nanoparticles
- often designed for a specific use
- can be natural
- seaspray
- combustion
- can be natural
- added to materials to give them different properties
- sports (for durability) and medical equipment (silver nanoparticles have antibacterial properties)
- larger surface-area-to-volume ratio - different properties
- effects on health not fully understood yet
- Natural and Synthetic materials
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