directional chain

https://doi.org/10.1351/goldbook.14207
Polymer chain that may be oriented in two distinguishable, opposite directions along the chain axis.
Note: The two possible chain orientations can be mutually interconverted through a rotation around a twofold axis orthogonal to the chain axis.
Examples:
  1. Directional chains are poly(amino acids), Nylon 6, polyesters from hydroxyacids, and isotactic poly-α-olefins.
  2. Chains that are not directional are polyethylene, syndiotactic poly-α-olefins, and Nylon 6,6.
Source:
PAC, 2011, 83, 1831. (Definitions of terms relating to crystalline polymers (IUPAC Recommendations 2011)) on page 1839 [Terms] [Paper]
Citation: 'directional chain' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.14207 RIS BibTex EndNote
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