The big molecules that make up this polymer must have repeating units.
A polymer is made up of lengthy chains of monomers, which are smaller repeating units.
For instance, long chains of ethylene (CH2=CH2) molecules are connected end to end to form polyethylene.
Polyethylene's chemical formula is -CH2CH2-(CH2CH2)n-CH2CH2-, where n is typically a figure between 500 and 10,000.
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