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Polyurethane
- 1. Polyurethane I am BipinSaud 3rd semester A7 College of Biomedical Engineering and Applied Sciences You can find me at: saudbipin@gmail.com
- 2. ➜Introduction ➜History ➜Biodegradbale nature ➜Why dowe need? ➜Advantages ➜ Disadvantages ➜Applications ➜Conclusion ➜Reference Contents
- 3. ➜ Also knownas PU ➜ Formed by reacting a polyol with a diisocyanate ➜ Composed of urethane (organic units) joined by carbamate link ➜ Have elastomer property ➜ Polyurethane are block of co- polymers containing hard and soft blocks Introduction
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- 5. ➜Dr. Otto Bayerdiscovers the basic polyurethane chemistry I.G. Farben in 1937 ➜Rigid foam first introduced into aircraft in 1940 ➜Adhesive between rubber, metal and glass in 1941 ➜First insulation application – a beer barrelin 1948 History
- 6. ➜Space suits withpolyurethane lining developed by NASA for the Mercury mission in 1959 ➜Energy- absorbing foam for passenger safety in cars in 1985 ➜Used as a lightweight design and high-performance insulator for e-cars in 2011 Cont.
- 7. In 1958,Pangman described composite breast prostheses covered with a polyester-urethane foam Since 1970 as orthopedic and medical applications In 1991 first commercial polyurethane memory foam mattress produced in the US by Tempur-Pedic Recognition As Biomaterial
- 8. Since 1993it was being used as thin wall medical hoses, i.e. catheters Since 2004 Syncardia total artificial heart, with polyurethane ventricles, approved for use after 10-year clinical trial Recognition As Biomaterial
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- 10. Breast prostheses coveredwith a polyester- urethane foam
- 11. Traditional aroaticdiisocyanate are putative carcinogenic compounds Biodegradbale polyurethane are made from biocompatible diisocyanate such as lysine- diisocyanate or hexamethylene diisocyante that releases non toxic products Biodegradation mechanism involves hydrolytic cleavage of ester bond Biodegradable nature
- 12. Higher tensilestrength Fatigue resistance Tear and abrasion resistance More haemocompatible Tensile and elastic properties of such polymer mimic the native blood vessels Glass transition temperature (Tg) of this polymer is less than room temperature(soft block) Why do we need it?
- 13. Calcifying property Excellent barrier property and oxygen permeability Poor degradation behavior The ease of bulk and surface modification Why do we need it?
- 14. Because ofexcellent barrier property and oxygen permeability help to make wound dressing Easy bulk and surface modification help to develop various medical devices Used to protect implantable sensing devices It’s haemocompatible nature helps to make blood interfacing medical devices Advantages
- 15. Prolonged useof polyurethane prone to oxidation and hydrolysis results in crack formation and calcification Poor thermal capability Poor weatherability Utilize toxic isocyanates Failure of pacemaker lead and breast implants coating Disadvantages
- 16. Development ofwound dressing Vascular stents Vascular graft Artificial heart Meniscal reconstruction Myocardial repair Drug polymer Polyurethane foam covered silicone gel breast implants Applications
- 17. Vascular graft standardprocedure
- 18. As thesurface and bulk properties of the polyurethane are easy to modify to meet the requirements of specific applications, many researches are being conducted on it Conclusion
- 19. References https://en.wikipedia.org/wiki/Polyurethane http://www.upcinc.com/resources/materials/PU.ht ml http://www.precisionurethane.com/urethane- advantage.html http://www.essentialchemicalindustry.org/polyme rs/polyurethane.html
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