Repeating unit of polymers
Repeating unit of polymers
The term “repeating unit” denotes an elementary unit which periodically repeats itself along the polymeric chain. It is defined also as monomer or monomeric unit, but not always in the correct way.
A monomer is a low molecular weight compound from which the polymer is obtained through the synthesis reaction.
A monomeric unit is a molecular structure, defined by the monomer, constituting part of the repeating unit.
Frequently repeating unit, monomer and monomeric unit are coincident, as in the following examples:
|monomer |repeating unit/ |polymer |
| |monomeric unit | |
| | | | |
|[pic] |ethylene |[pic] |polyethylene |
| | | | |
|[pic] |vinyl chloride |[pic] |poly(vinyl chloride) |
| | | | |
|[pic] |styrene |[pic] |polystyrene |
In other cases repeating and monomer units differ from the monomer by a limited number of atoms in the chemical formula, as in the following example:
|monomer |repeating unit/ |polymer |
| |monomeric unit | |
| | | | |
|[pic] | |[pic] | |
| |(-amino-capronic | |polyamide 6 |
| |acid | |(nylon 6) |
In the last example, where the synthesis reaction requires the alternate combination of two different monomers, the repeating unit is formed by two monomeric units:
|monomer |repeating unit |polymer |
| | | |
|[pic] | | |
| | | |
|hexamethylendiamine |[pic] | |
| | |polyamide 6,6 |
|[pic] | |(nylon 6,6) |
|adipic acid | | |
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monomeric units
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