Addition polymers:
They are also known as chain growth polymers. Alkenes are the monomers. All atoms of monomer are present in the polymer. Examples include orlon, teflon, PVC, polyethylene, etc.
nF2C=CF2 Tetrafluoroethylene (monomer) polymerisation −−−−−−−−−−−−−→−[CF2−CF2]− Teflon