Title: polymer blend
Long Title: IUPAC Gold Book - polymer blend
DOI: 10.1351/goldbook.P04736
Status: current

Definition
Macroscopically homogeneous mixture of two or more different species of polymer.

Notes
1) In most cases, blends are homogeneous on scales larger than several times the wavelengths of visible light.
2) In principle, the constituents of a blend are separable by physical means.
3) No account is taken of the miscibility or immiscibility of the constituent macromolecules, i.e., no assumption is made regarding the number of phase domains present.
4) The use of the term polymer alloy for a polymer blend is discouraged, as the former term includes multiphase copolymers but excludes incompatible polymer blends.
5) The number of polymeric components which comprise a blend is often designated by an adjective, viz. binary, ternary, quaternary, etc.

Related Terms
- constituent: https://goldbook.iupac.org//terms/view/C01281
- immiscibility: https://goldbook.iupac.org//terms/view/IT07239
- miscibility: https://goldbook.iupac.org//terms/view/MT07230
- polymer alloy: https://goldbook.iupac.org//terms/view/PT07264
- polymeric: https://goldbook.iupac.org//terms/view/M03667
- visible: https://goldbook.iupac.org//terms/view/VT07496

Source
- PAC, 2007, 79, 1801. 'Definitions of terms relating to the structure and processing of sols, gels, networks, and inorganic-organic hybrid materials (IUPAC Recommendations 2007)' on page 1817 (https://doi.org/10.1351/pac200779101801)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/P04736/html
- json: https://goldbook.iupac.org/terms/view/P04736/json
- xml: https://goldbook.iupac.org/terms/view/P04736/xml

Citation: Citation: 'polymer blend' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.P04736
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Accessed: 2026-04-19T07:37:03+00:00