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Rubber

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  • 1. Rubber
  • 2. It is the sticky, elastic solid produced from a milky liquid called latex.
    Can be classified as natural or synthetic rubber.
    What is rubber?
  • 3. Natural Rubber
  • 4. What is Natural Rubber?
    • An elastomer(An Elastic Hydrocarbon Polymer) that was originally derived from latex.
    • 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. It is normally stretchy, flexible, and extremely water-proof.
  • Para Rubber Tree
    GuttaPercha
    Rubber Fig
    Panama Rubber tree
    Common Dandelion
    Haveabrasilienis tree
    Varieties of Natural Rubber:
  • 7. Elasticity
    Tensile Strength
    Flexibility
    Solubility
    Abrasion Resistance
    Properties:
  • 8. Have a milk contains an anti-bacterial substance that is a natural dust-mite repellent.
    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.
    Superior Air circulation creates an environment which naturally prevents mold and mildew growth.
    Advantages of Natural Rubber:
  • 9. Retention of shape and firmness for even support year in and year out.
    Superior durability and elasticity for mattress longevity.
    Flexibility combined with stability for continuous sleep comfort.
    Excellent natural heat and moisture regulation.
    Advantages of Natural Rubber:
  • 10. Uses:
    • Manufacturing
    • 11. Textile Applications
  • Synthetic Rubber
  • 12. Is any type of artificial elastomer, invariably a polymer.
    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.
    Synthetic rubber serves as a substitute to Natural rubber in many cases, especially when improved material properties are needed.
    What is Synthetic Rubber:
  • 13. Synthetic Rubber can be made by a process called polymerization, the process of changing monomers into polymers
  • 14. Polybutadiene
    Epichlorohydrin
    Polyurethane
    Styrene-butadine
    Common Synthetic Rubbers used:
  • 15. Vulcanized Rubber
  • 16. Is a process of converting rubber or related Polymers into more durable via the addition of sulfur or other equivalent curatives.
    Named after the Roman God of fire, Vulcan.
    It was invented by Charles Goodyear in 1839.
    What is Vulcanization?
  • 17. Cross-linking of Poly(isoprene) and Sulfur
  • 18. Sulfur
    Peroxides
    Urethane crosslinkers
    Metallic oxides
    Duece
    Acetoxysilane
    Common curing systems used:
  • 19. Comparison
    Vulcanized
    Natural
    VS
  • 20. Comaparison
    Natural
    Vulcanized
    Crude rubber is sticky and an elastic solid. It becomes soft and sitcky as the temp. Rises.
    Raw Natural Rubber has elasticity over a narrow range of temperature from 10-60 Centigrade.
    Raw Natural Rubber has low tensile strength and abrasion resisitant.
    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.
    Vulcanized Rubber can withstand -40-100 Centigrade.
    Vulcanized Rubber has better Tensile strength
  • 21. Comparison
    Natural
    Vulcanized
    Absorbs a large amount of water.
    Low abrasion resistance.
    Soluble in solvents like ether, carbon, disuphide,carbon tetrachloride, petrol and turpentine
    Absorbs a small amount of water.
    High Abrasion resistance.
    Insoluble in all the usual solvents.