Addition Polymerization

WHAT IS ADDITION POLYMERIZATION?

gekhoIn addition polymerization, all the original atoms present used for making the polymers are retained in the end product.

“NO ATOMS ARE LOST
Just add them all up!”

HOW TO CONVERT MONOMERS TO POLYMERS

a-monomerImagine you have a polymer Ethylene. Ethylene is a single molecule C2H4. It’s double bonded so the molecule can be represented as H2C=CH2.

A double bond is a bond between two atoms sharing two pair of electrons.

Single, Double & Triple Bonds

Remember: Convert double bonds to single bond

a-polymer

To form a polymer of molecules, the double carbon to carbon bonds are broken to become single bonds. Another important aspect is the open bonds at both ends of the polymer to allow for more linking of molecules.

To change from a double bond to a single bond, replace the C = C  to C – C.

acatalystAnd don’t forget the cat(alyst) which contributes to the process but does not need to be shown in the equation. The catalyst helps to speed up the reaction but itself does not undergo any chemical change.

EXAMPLE – PVC (VINYL CHLORIDE) BECOMES POLYVINYL CHLORIDE

ADDITION POLYMERIZATION

COMBINING 3 VINYL CHLORIDE MONOMERS TO BECOME POLYVINYL CHLORIDE MONOMERS

EXAMPLE – PROPENE BECOMES POLYPROPENE

ADDITION POLYMERIZATION

POLYMERIZATION-monomers-addition-ethyene

Remember: Convert double bonds to single bonds

You can construct a polymer structure from a monomer from the following steps:

  • Show the repeating unit for the nth term

  • Replace double bonds with single bonds

  • Place open bonds at both ends

Leave a Reply

Your email address will not be published.