HDPE AND LDPE.
Monomer - a single unit. Join together to make long chain polymers.
LDPE - Low density Polyethene
HDPE - High density Polyethene
LDPE is flexible. The monomers used to create these polymers is ethene, however, the way in which the ethene molecules are arranged in a polymer will determine its properties (the structure and bonding).
LDPE = the monomers are far apart