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POLYMER - Coggle Diagram

- - - - basic unit: monomer
  - - - can obtain from surrounding
        
        starch
        
        protein
        
        cotton
    - - man-made
        
        nylon
        
        polyethene
        
        polystyrene
        
        PVC
  - - - can be repeatedly remoulded
        
        PVC
        
        polyethene
    - - cannot be remoulded after heating
        
        melamine
        
        bakelite
    - - can stretched & return to their original shape
        
        polyurethane
        
        SBR
  - - - monomers that have double covalent bonds between two carbon atoms react
    - - involves at least 2 different monomers
      - product
        
        polymer
        
        by-product
        
        H2O
        
        HCl
- - - - 'susu getah'
      - contain natural polymer
        
        polyisoprene
    - - -vely charged
        
        repel
  - - - -vely charged protein membrane causes rubber particles to repel
      - hydrogen ions from acid neutralise the -vely charged protein membrane
      - rubber particles collide ,causes the protein membrane to break
      - rubber polymers combine,causes the latex to coagulate
    - - add alkaline solution to neutralise the acid
        
        ammonia
  - - - process of producing rubber that is more elastic & better quality through the production of cross-links between polymer chains.
      - double bond between carbons + sulphur/other substances ----> sulphur cross-links
    - - use peroxide
      - irradiation
      - metal oxide
    - - more elastic
      - hard
      - high strength
      - high resistance towards heat
      - more resistant towards oxidation
- - - - heat
      - chemicals
      - oxidation