The whole or part of a macromolecule
, an oligomer molecule
or a block
, comprising a linear or branched sequence
of constitutional units
between two boundary constitutional units, each of which may be either an end-group
, a branch point
or an otherwise-designated characteristic feature of the macromolecule.
- Except in linear single-strand macromolecules, the definition of a chain may be somewhat
- A cyclic macromolecule has no end groups but may nevertheless be regarded as a chain.
- Any number of branch points may be present between the boundary units.
- Where appropriate, definitions relating to 'macromolecule' may also be applied to 'chain'.
PAC, 1996, 68, 2287
(Glossary of basic terms in polymer science (IUPAC Recommendations 1996))
on page 2293