 Radical Copolymerization Reactivity Ratios by IUPAC

Official IUPAC recommendation announcement; Recommendations published in Pure and Applied Chemistry, advance online 26 September 2025, DOI 10.1515/pac-2024-0235. Indexed primary announcement: determine terminal-model reactivity ratios from conversion and copolymer composition in three or more reactions with different initial monomer compositions; integrated composition modelling, joint confidence regions and measurement errors. Full technical record: www.degruyterbrill.com/document/doi/10.1515/pac-2024-0235/html . The announcement reader returned 403; the indexed institutional text and published technical introduction were readable. No individual recommendation byline is inferred from the institutional announcement.