polysilsesquioxane

https://doi.org/10.1351/goldbook.15301
Polymer composed of macromolecules containing silicon and oxygen atoms in the ratio \(1{:}1.5\) (ideal ratio for infinite macromolecule), which alternate in a hyperbranched or ladder structure such as:
polysilsesquioxane
where \(\ce{R}\) is alkyl, aryl, or heteroaryl.
polysilsesquioxane
Notes:
  1. The ideal value of the \(\ce{O{:}Si}\) ratio of \(1.5{:}1\) is achieved only in the case of a ladder polymer. For hyperbranched polysilsesquioxanes, the value of the \(\ce{O{:}Si}\) ratio is higher.
  2. Polysilsesquioxanes are a subclass of polysiloxanes.
Source:
PAC, 2009, 81, 1131. (Glossary of class names of polymers based on chemical structure and molecular architecture (IUPAC Recommendations 2009)) on page 1167 [Terms] [Paper]
Citation: 'polysilsesquioxane' 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.15301 RIS BibTex EndNote
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