The reaction of either of these two compounds within the vulcanization process are used to link the Polymer Chains together creating Carbon-Carbon bonds (C-C) or Carbon-Sulphur bonds (C-S). Sulphur was originally used to generate the chemical reaction for vulcanizing rubber as it worked across most of the polymer types available at the time, but polymers have evolved other means of achieving the same reaction have led to Peroxide being used. Other chemical agents and processes or modifications to the above have been developed to best suit the polymer type and or outcome required.<br>In the range of ethylene-propylene (EP) rubber we have two types of product #EPR = EP copolymer and #EPDM (EthylenePropyleneDieneMonomer) = EP terpolymer- what I hear you cry does that mean - warning we are about to go Greek.<br>The polymer chains are made up of one or more 'monomers' (Greek for single unit) which link together (refer back to spaghetti analogy earlier). A copolymer is made up of two monomers (two units) and terpolymer is made up from three monomers (three units). On this basis EP is a copolymer produced from two monomers, Ethylene and Propylene; EPDM is a terpolymer with Ethylene, Propylene and the additional third monomer being Diene.
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