Term: ionomer cluster
https://doi.org/10.1351/goldbook.IT07215

Definition:
Ionic aggregate, in a polymer matrix of low polarity, formed through interactions of ionomer multiplets.

Notes:
0) The @M03955@ of the polymer segments surrounding the multiplets is reduced relative to that of bulk material. With increasing ion content, the @N04262@ of the @I03229@ multiplets increases, leading to overlapping of the restricted @M03955@ regions around the multiplets and the formation of clusters.
1) Typically, an @I03229@ exhibits two @G02640@ temperatures (Tg), one for the non-polar matrix and the other for clusters.

Related Terms:
1) mobility (http://doi.org/10.1351/goldbook.M03955).
2) number density (http://doi.org/10.1351/goldbook.N04262).
3) ionomer (http://doi.org/10.1351/goldbook.I03229).
4) glass transition (http://doi.org/10.1351/goldbook.G02640).
5) polarity (http://doi.org/10.1351/goldbook.P04710).

Source: PAC, 2006, 78, 2067. 'Terminology of polymers containing ionizable or ionic groups and of polymers containing ions (IUPAC Recommendations 2006)' on page 2072 (https://doi.org/10.1351/pac200678112067)

Citation: 'ionomer cluster' 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.IT07215

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