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  1. 1. Rubber<br />
  2. 2. It is the sticky, elastic solid produced from a milky liquid called latex.<br />Can be classified as natural or synthetic rubber.<br />What is rubber?<br />
  3. 3. Natural Rubber<br />
  4. 4. What is Natural Rubber?<br /><ul><li>An elastomer(An Elastic Hydrocarbon Polymer) that was originally derived from latex.
  5. 5. The plants would be tapped, that is, an inscision made into the bark of the tree and the sticky , milk-colored latex sap collected and refined into a usable rubber.
  6. 6. It is normally stretchy, flexible, and extremely water-proof.</li></li></ul><li>Para Rubber Tree<br />GuttaPercha<br />Rubber Fig<br />Panama Rubber tree<br />Common Dandelion<br />Haveabrasilienis tree<br />Varieties of Natural Rubber:<br />
  7. 7. Elasticity<br />Tensile Strength<br />Flexibility<br />Solubility<br />Abrasion Resistance<br />Properties: <br />
  8. 8. Have a milk contains an anti-bacterial substance that is a natural dust-mite repellent.<br />Natural rubber manufactured from this unique substance also breathes perfectly and is not temperature-sensitive. As a result it never feels moist or warm to touch.<br />Superior Air circulation creates an environment which naturally prevents mold and mildew growth.<br />Advantages of Natural Rubber: <br />
  9. 9. Retention of shape and firmness for even support year in and year out.<br />Superior durability and elasticity for mattress longevity.<br />Flexibility combined with stability for continuous sleep comfort.<br />Excellent natural heat and moisture regulation.<br />Advantages of Natural Rubber:<br />
  10. 10. Uses:<br /><ul><li>Manufacturing
  11. 11. Textile Applications</li></li></ul><li>Synthetic Rubber<br />
  12. 12. Is any type of artificial elastomer, invariably a polymer.<br />An Elastomer is a material with the mechanical property that it can undergo much more elastic deformation under stress than most materials and still return to it’s previous size without permanent deformation.<br />Synthetic rubber serves as a substitute to Natural rubber in many cases, especially when improved material properties are needed.<br />What is Synthetic Rubber:<br />
  13. 13. Synthetic Rubber can be made by a process called polymerization, the process of changing monomers into polymers<br />
  14. 14. Polybutadiene<br />Epichlorohydrin<br />Polyurethane<br />Styrene-butadine<br />Common Synthetic Rubbers used:<br />
  15. 15. Vulcanized Rubber<br />
  16. 16. Is a process of converting rubber or related Polymers into more durable via the addition of sulfur or other equivalent curatives.<br />Named after the Roman God of fire, Vulcan.<br />It was invented by Charles Goodyear in 1839.<br />What is Vulcanization?<br />
  17. 17. Cross-linking of Poly(isoprene) and Sulfur<br />
  18. 18. Sulfur<br />Peroxides<br />Urethane crosslinkers<br />Metallic oxides<br />Duece<br />Acetoxysilane<br />Common curing systems used:<br />
  19. 19. Comparison<br />Vulcanized<br />Natural<br />VS<br />
  20. 20. Comaparison<br />Natural<br />Vulcanized<br />Crude rubber is sticky and an elastic solid. It becomes soft and sitcky as the temp. Rises. <br />Raw Natural Rubber has elasticity over a narrow range of temperature from 10-60 Centigrade.<br />Raw Natural Rubber has low tensile strength and abrasion resisitant.<br />Vulcanization prevents the Polymer Chains from moving independtly. As a result, when stress is applied to VR deforms, but upon the release of stress, it reverts back to its shape.<br />Vulcanized Rubber can withstand -40-100 Centigrade.<br />Vulcanized Rubber has better Tensile strength<br />
  21. 21. Comparison<br />Natural<br />Vulcanized<br />Absorbs a large amount of water.<br />Low abrasion resistance.<br />Soluble in solvents like ether, carbon, disuphide,carbon tetrachloride, petrol and turpentine<br />Absorbs a small amount of water.<br />High Abrasion resistance.<br />Insoluble in all the usual solvents.<br />