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Dacron

Dacron. Sanaz Leilabadi and Linda Edwards. Get to know Dacron. Trade name for Polyethylene Terephthalate aka PET, PETE, PETP Polyethylene Terephthalate is a resin of the polyester family that is used to make beverage, food and other liquid containers, synthetic fibers

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Dacron

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  1. Dacron Sanaz Leilabadi and Linda Edwards

  2. Get to know Dacron • Trade name for Polyethylene Terephthalate aka PET, PETE, PETP • Polyethylene Terephthalate is a resin of the polyester family that is used to make beverage, food and other liquid containers, synthetic fibers • Clear, tough plastic with good gas and moisture barrier properties

  3. Chemically Speaking Condensation Polymer Polyethylene terephthalate is synthesized by transesterification of two monomers: Ethylene glycol and Dimethyl terephthalate +

  4. Transesterification is used in the synthesis of polyester, in which diesters undergo transesterification with diols to form macromolecules. In our case, dimethyl terephthalate and ethylene glycol react to form polyethylene terephthalate and methanol, which is evaporated to drive the reaction forward.

  5. Catalysts • Transesterification reactions are often catalyzed by the addition of an acid or base. • Acids can catalyse the reaction by donating a proton to the alkoxy group, thus making it more reactive, while bases can catalyse the reaction by removing a proton from the alcohol, thus making it more reactive.

  6. Polymer

  7. Mechanism of Polymerization

  8. History of Dacron • PET: originally patented by British chemists • John Rex Whinfield and James Tennant Dickson in 1941 after early research by Wallace Carothers • Dupont used its nylon technology to improve the polyester fiber that was patented by the British • Dacron was created in 1950 by Dupont

  9. What IS Dacron? • A polyester fiber used in clothing. • A yarn used in: • curtains • dress fabrics • high pressure fire hoses • men’s shirts • threads.

  10. Dacron Products • Boat sails • Antenna rope • Climbing ropes • Foam covers • Carpets and textiles • Furniture • Luggage

  11. Where can we find it?

  12. Dacron in Medicine • Cardiothoracic and Vascular grafts and implants • Aneurysm repair (Thoracic and Abdominal Aorta) • Patch Angioplasty • Vascular grafts • Strong, flexible and treated with collagen to keep blood from soaking through • Chemically inert and thus well tolerated inside the body

  13. Dacron- Then and Now • Dacron has come a long way since 1950 • More commonly used today thanks to new technology • Price range varies depending on the product it as been made into • Intrinsic viscosity (thickness) of ~0.60 (fibers) • PET can range up to ~0.85 for tire cord

  14. Recycling Dacron • Methanolysis is an example of reverse transesterification and has been used to recycle polyesters into individual monomers • Fully recyclable- when needed • Its polymer chains can be recovered for reuse.

  15. One study showed that after imbedding polymer films of Dacron in rodents there was evidence of some malignant tumor formation, study was later deemed inadequate Further research shows no short term or long term toxicity with use of Dacron However, strong evidence of nausea, vomiting, central nervous system paralysis and kidney damage with prolonged exposure to ethylene glycol Health Effects

  16. Dacron Properties • High tensile strength, high resistance to stretching, both wet and dry, and good resistance to degradation by chemical bleaches and to abrasion which is why it is preferred for surgical use • High melting temperature of 496 degrees Fahrenheit (256 degrees Celsius), due to cross-linkage in synthesis of the fiber.

  17. For more information • http://www.elmhurst.edu/~chm/vchembook/402condensepolymers.html • http://www.bicuspidfoundation.com/Aortic_Aneurysm_and_Dissection.html • http://www.bartleby.com/65/da/Dacron.html • http://www.nlm.nih.gov/medlineplus/ency/article/002345.htm • http://md1.csa.com/partners/viewrecord.php?requester=gs&collection=TRD&recid=CA6703713WC • http://education.yahoo.com/reference/encyclopedia/entry/Dacron • http://www.me.berkeley.edu/ME117/S05/finalproject/pdf/Vascular_Graft.pdf • http://www.alibaba.com/productsearch/Adhesive_Paper/10.html • http://www.surgical-tutor.org.uk/default-home.htm?tutorials/graft.htm~right • http://www.texdev.com/sld007.html • http://en.wikipedia.org/wiki/Dacron

  18. QuestionsDiscussion

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