CHEM 121 glossary
Addition polymer
A polymer formed when monomers containing a C=C double bond join end to end as the π bond opens. No atoms are lost, so the repeat unit has the same formula as the monomer, and the backbone is made only of carbon atoms.
Propene: its C=C becomes the two backbone carbons of polypropylene.
Example
: styrene gives polystyrene with no byproduct.