Animated science topic " Rubber " : It is derived comes from the sap of the Para rubber tree, Hevea brasiliensis. It is a colloid. Natural rubber is chemically poly-cis-isoprene formed from monomer isoprene.Vulcanization is a process for hardening rubber. Rubber is heated with Sulphur or Sulphur compounds. This animated chemistry topic gives in-depth information about Rubber and is very useful for schools and industry.

Content of the science animation : Natural rubber is chemically poly-cis-isoprene which is formed from the monomer isoprene. It comes from the sap of the Para rubber tree, Hevea brasiliensis. Trees are tapped by making a spiral cut through the bark. The sap is called latex. It is a white milky liquid. It is a suspension of tiny particles of rubber in water. These particles can be separated when acid is added to it and solid rubber is obtained.

Vulcanizing is a process for hardening rubber. The rubber obtained from the tree is sticky and soft. In vulcanization process rubber is heated with Sulphur or Sulphur compounds at a definite temperature for a definite time.
Vulcanizing causes the long molecules to form chemical bonds that join them side-to-side. The sulfur chains help to align the polymer chains, so the material does not undergo a permanent change when stretched but spring back to its original shape and size when the stress is removed

This treatment converts the soft, sticky mass of rubber into a hard, tough substance. This process is used in the manufacturing of tires of vehicles.
All about it inside the animation.

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