axial advancement per constitutional repeating unit

symbol: $h$; unit: $\pu{m}$
synonym: unit height
https://doi.org/10.1351/goldbook.14206
Projected length of a constitutional repeating unit (CRU) on the chain axis.
Notes:
  1. The axial advancement per CRU is characteristic of the conformation of a polymer chain. A large axial advancement per CRU is said to define a more extended conformation and a small axial advancement per CRU is said to define a more contracted conformation.
  2. The value of \(h\) is obtained from the equation \[h = \frac{c}{M_{\rm{R}}}\] where \(c\) is the chain identity period and \(M_{\rm{R}}\) is the number of CRUs in \(c\). In cases where the equivalence postulate does not apply, \(h\) is an average value.
Source:
PAC, 2011, 83, 1831. (Definitions of terms relating to crystalline polymers (IUPAC Recommendations 2011)) on page 1836 [Terms] [Paper]
Citation: 'axial advancement per constitutional repeating unit' 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.14206 RIS BibTex EndNote
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