Rotation per helix residue

{
  "id": "MLC-T-CHM-010418",
  "term": "Rotation per helix residue",
  "field": "Chemistry",
  "definition": "The angle of rotation about the helix axis that relates the position of one constitutional repeating unit to the next identical unit along the helix of a crystalline polymer. This value quantifies the helical twist between successive repeating units. It is expressed in degrees and is a key parameter, along with the axial translation, in defining the helical symmetry of the polymer chain.",
  "synonyms": [
    "unit twist"
  ],
  "subject": "Polymer",
  "references": [
    "PAC, 2011, 83, 1831. 'Definitions of terms relating to crystalline polymers (IUPAC Recommendations 2011)' on page 1843 (https://doi.org/10.1351/PAC-REC-10-11-13)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/rotation-per-helix-residue/"
}