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Polymers (Applications in Medicine (PMMA (Contact lenses, Intraocular…

- - - - Block copolymer
      - Random copolymer
      - Alternating copolymer
  - - - Fibrous encapsulation
    - - Dissolution
      - Cells/enzymes
- - - - No crystallinity
      - Glass-like structure
    - - Crystalline regions restrict flow, creep
        and plastic deformation
      - Degree of crystallinity affects mechanical
        properties and permeability.
      - No grains or brain boundaries
      - Amorphous and crystalline regions
      - Reduces viscoelastic response
  - - - Chemical structure
      - Bonds must be broken to change it
    - - 3D structure
      - Bond rotation allows changes
    - - C atom with 4 different groups
      - Linkage
        
        Atactic
        
        Generally dominates
        
        Syndiotactic
        
        Isotactic
      - Optical activity
        (can rotate plane polarised light)
- - - - 2 monomers are reacted
      - Small molecule eliminated
      - Polyamides, Polyesters
      - May be hydrolysed in the body
    - - Free radical addition reaction
      - From unsaturated monomers with C=C
      - e.g. PMMA, PE