# Pendant group

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Pendant_group
> Markdown URL: https://mediated.wiki/source/Pendant_group.md
> Source: https://en.wikipedia.org/wiki/Pendant_group
> Source revision: 1227019664
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

{{short description|Group of atoms attached to a long molecule's backbone chain}}
{{Quote box
 |title =[IUPAC](/source/International_Union_of_Pure_and_Applied_Chemistry) definition
 |quote = '''Pendant group'''<br/>'''Side-group'''<br/>An offshoot, neither oligomeric nor polymeric, from a chain.<ref>{{cite journal|title=Glossary of basic terms in polymer science (IUPAC Recommendations 1996)|journal=[Pure and Applied Chemistry](/source/Pure_and_Applied_Chemistry)|year=1996|volume=68|issue=12|pages=2287–2311|doi=10.1351/pac199668122287|doi-access=free| last1=Jenkins | first1=A. D. | last2=Kratochvíl | first2=P. | last3=Stepto | first3=R. F. T. | last4=Suter | first4=U. W. }}</ref> 
}}

In [IUPAC nomenclature](/source/IUPAC_nomenclature_of_chemistry) of [chemistry](/source/chemistry), a '''pendant group''' (sometimes spelled '''pendent''') or '''side group''' is a group of [atom](/source/atom)s attached to a [backbone chain](/source/backbone_chain) of a long [molecule](/source/molecule), usually a [polymer](/source/polymer). Pendant groups are different from [pendant chains](/source/side_chain), as they are neither [oligomer](/source/oligomer)ic nor polymeric.<ref>{{GoldBookRef|title=pendant group (side group)|file=P04472}}</ref>

center

For example, the [phenyl group](/source/phenyl_group)s are the pendant groups on a [polystyrene](/source/polystyrene) chain.

Large, bulky pendant groups such as [adamantyl](/source/adamantyl) usually raise the [glass transition temperature](/source/glass_transition_temperature) ({{mvar|T{{sub|g}}}}) of a polymer by preventing the chains from sliding past each other easily. Short alkyl pendant groups may lower the {{mvar|T{{sub|g}}}} by a lubricant effect.

==References==
{{reflist}}

Category:Organic chemistry

{{polymer-stub}}

---
Adapted from the Wikipedia article [Pendant group](https://en.wikipedia.org/wiki/Pendant_group) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Pendant_group?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.