1. What is a polymer?

2. Polymers that you know…. Polyurethane Polycarbonate Polyethylene Polyacrylamide Polystyrene Poly(vinyl chloride) chemicals-technology.com http://www.chemicals-technology.com/projects/BASF-HPPO/BASF-HPPO2.html (accessed date: June 21,2010)http://www.chemicals-technology.com/projects/BASF-HPPO/BASF-HPPO2.html earth911.comhttp://earth911.com/recycling/plastic/pvc/ (accesssed date:June 21,2010) http://mypatiofarm.files.wordpress.com/2009/05/coke_2litre_bottles2.jpg (accessed date: June 21,2010)http://reusablebags.typepad.com/photos/uncategorized/2008/01/16/nalgene_bottles.jpg (accessed date: June 21,2010).Catering Hygiene http://www.slsonline.co.uk/showdetails.asp?id=2148 (accessed date: June 21,2010)http://www.slsonline.co.uk/showdetails.asp?id=2148http://hanshaupt.files.wordpress.com/2009/06/soft-contact-lens.jpg http://hanshaupt.files.wordpress.com/2009/06/soft-contact-lens.jpg (accessed date: June 21,2010)

3. But what is a polymer…. A B

4. Polymers that you know…. Polyurethane Polystyrene Polycarbonate Polyethylene Polyacrylamide Polystyrene Poly(vinyl chloride)

5. Polymers in medical devices Polyurethane Poly(vinyl chloride) Polytetrafluoroethylene Polyurethane (inner) Polyethylene terephthalate (outer)

6. Silly Putty experiment Vinyl alcohol Monomer Tetrahydroxyborate anion Cross-Linking Agent Basic building block for polymer synthesis Linkers that chemical bond polymer chain together Poly(vinyl alcohol) Polymer

7. How does a cross-linker work?

8. Cross-linker affect on material properties More chains linked together Increasing stiffness Less range of motion available  rigid and stiff No chains linked together Larger range of motion available to some chains  more bouncy No Cross-linksWith Cross-links