double-strand chain

in polymers
A @C00946@ that comprises @C01288@ connected in such a way that adjacent constitutional units are joined to each other through three or four atoms, two on one side and either one or two on the other side of each @C01288@.
PAC, 1996, 68, 2287. (Glossary of basic terms in polymer science (IUPAC Recommendations 1996)) on page 2294 [Terms] [Paper]