View source for Pendant group

{{short description|Group of atoms attached to a long molecule's backbone chain}}
{{Quote box
 |title =[[International Union of Pure and Applied Chemistry| IUPAC]] 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]]|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 of chemistry|IUPAC nomenclature]] of [[chemistry]], a '''pendant group''' (sometimes spelled '''pendent''') or '''side group''' is a group of [[atom]]s attached to a [[backbone chain]] of a long [[molecule]], usually a [[polymer]]. Pendant groups are different from [[side chain|pendant chains]], as they are neither [[oligomer]]ic nor polymeric.<ref>{{GoldBookRef|title=pendant group (side group)|file=P04472}}</ref>

[[Image:Polystyrene formation.PNG|center]]

For example, the [[phenyl group]]s are the pendant groups on a [[polystyrene]] chain.

Large, bulky pendant groups such as [[adamantyl]] usually raise the [[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==
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[[Category:Organic chemistry]]


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