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Tec Theory revision - Coggle Diagram

- - - - seperate into factions using a fractionating cloumn
        
        crack the factions, to break the double bond, and form a polymer
      - useful for packaing, carrier bags, phone cases
        water bottles car parts, and interiors
      - 2 types - thermoforming, thermo setting
        themroforming, can be melted down after use and be recyled, however degraded each time.
        themrosetting, when orginally made cannot be remelted back down, so go to landfill, where it degrates into microplastics
  - - - Hardwoods
        
        grows slower
        tends to be stronger
        therefore is more expensive
        used in furnture and decoration
        examples - mahogany, oak,
      - softwoods
        
        are a lot cheaper
        grows far faster
        tends to be weaker
        easier to work with, used for joists fences etc.
        example - spruce, pine beech
      - general
        easy to dispose of
        can be shaped and carved
        come in stard sizes and often as planks
        Rough - essentallly cut ot size and nothing else - used for internal building owrk like joists
        PAR - stands for planned all around, this is a bit smaller than rough as it sanded, used for decking and wurniture
  - - - aluminum
        
        lower melting point than other metals
        
        forms aluminum oxide when exposed to air, however this then forms a protectiv layer - preventing further corrosion
        
        lighter than a lot of other materails
        
        used in avation, cars and drinks cans
      - Iron - not really used anymore due to rust - iron oxide is formed and then flakes off creating more rust, and adamging structual interity
        
        steel
        
        this is an alloy of iron, having had carbon added to it making it stronger and ligher
        there are two types low carbon steel, and high carbon steel
        High carbon steel = 1.5% to 3% carbon in the steel
        mild steel has 0.25% carbon
      - copper
        
        very very good conductor and is therefore used a lot in electronics
  - - - wool
        
        comes from sheep . is very sustainable, as sheep regrow it. it is great for outdoor clothing being naturally warms, and can shed water well, and is even fire resistant
      - polyester
        
        this a clothing made out of crude oil, the main advantage is that it cheap, bit burns easily, and is often often combined with other materils like cotton
      - cotton
  - - - this a layers of carbon woven together. this creates a very light weight and strong materail
        this is used in areonautics and high performance cars
        however differcult to repair
    - - glass reinforced platic. this is plastic with stirps of glass in it. GRP is very useful because made into complex shapes, can be coloured, and unlike metlas, doesn't corrode, and is tough enough to withstand impacts, meaning s used heavily for boats