Cardo polymer

{
  "id": "MLC-T-CHM-001674",
  "term": "Cardo polymer",
  "field": "Chemistry",
  "definition": "A polymer whose single-strand main chain carries many loop-like ring groups, each ring sharing exactly one atom with the backbone, typically a quaternary carbon such as C9 of fluorene. The bulky rings stiffen the chain and disrupt packing, giving a high glass-transition temperature together with good solubility and large free volume. Polyimides built from 9,9-bis(4-aminophenyl)fluorene are a common example and are studied for gas-separation membranes.",
  "subject": "Polymer",
  "references": [
    "PAC, 2009, 81, 1131. 'Glossary of class names of polymers based on chemical structure and molecular architecture (IUPAC Recommendations 2009)' on page 1175 (https://doi.org/10.1351/PAC-REC-08-01-30)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/cardo-polymer/"
}