A portion of a
macromolecule, comprising many
constitutional units that has at least one feature which is not present in the adjacent portions. Where appropriate, definitions relating to '
macromolecule' may also be applied to '
block'.
Source:
PAC, 1996, 68, 2287
(Glossary of basic terms in polymer science (IUPAC Recommendations 1996))
on page 2298