Pendant group
Group of atoms attached to a long molecule's backbone chain
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Through IUPAC nomenclature of chemistry, Chemistry and Atom
For example, the phenyl groups are the pendant groups on a polystyrene chain.
Large, bulky pendant groups such as adamantyl usually raise the glass transition temperature (Tg) of a polymer by preventing the chains from sliding past each other easily. Short alkyl pendant groups may lower the Tg by a lubricant effect.