Polyisoprene


      

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For polyisoprene at a glance, click here!
One of the most well known natural polymers is polyisoprene, or natural rubber. Ancient Mayans and Aztecs harvested it from the hevea tree and used it to make waterproof boots and the balls which they used to play a game similar to basketball. It is what we call an elastomer, that is, it recovers its shape after being stretched or deformed. Normally, the natural rubber is treated to give it crosslinks, which makes it an even better elastomer.


Polyisoprene is diene polymer, which is a polymer made from a monomer containing two carbon-carbon double bonds. Like most diene polymers, it has a carbon-carbon double bond in its backbone chain. Polyisoprene can be harvested from the sap of the hevea tree, but it can also be made by Ziegler-Natta polymerization. This is a rare example of a natural polymer that we can make almost as well as nature does.

This is what the isoprene monomer looks like:



The model on the right above is an image of the pdb model you can view by clicking here or you can just click on the image itself.
Either way, be sure to close the new window that opens up with the 3D model in it when you are ready to come back here.

Other polymers used as elastomers include:

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