Title: bulk mesophase
Long Title: IUPAC Gold Book - bulk mesophase
DOI: 10.1351/goldbook.B00754
Status: current

Definition
A continuous anisotropic phase formed by coalescence of mesophase spheres. Bulk mesophase retains fluidity and is deformable in the temperature range up to about \(770\ \rm{K}\), and transforms into green coke by further loss of hydrogen or low-molecular-weight species. This bulk mesophase can sometimes be formed directly from the isotropic pitch without observation of intermediate spheres.

Related Terms
- fluidity: https://goldbook.iupac.org//terms/view/F02450
- green coke: https://goldbook.iupac.org//terms/view/G02697
- isotropic: https://goldbook.iupac.org//terms/view/I03353
- mesophase: https://goldbook.iupac.org//terms/view/M03849
- pitch: https://goldbook.iupac.org//terms/view/P04677
- weight: https://goldbook.iupac.org//terms/view/W06668

Source
- PAC, 1995, 67, 473. 'Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)' on page 478 (https://doi.org/10.1351/pac199567030473)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/B00754/html
- json: https://goldbook.iupac.org/terms/view/B00754/json
- xml: https://goldbook.iupac.org/terms/view/B00754/xml

Citation: Citation: 'bulk mesophase' 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.B00754
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Accessed: 2026-07-14T19:57:06+00:00