biostudies-literatureKawamoto MJST, PRESTOToshiaki Ogasawara Memorial Foundatione70572https://www.ebi.ac.uk/biostudies/studies/S-EPMC12817154biostudies-literatureUnknown21(2)Conjugated diene polymers cross-linked with boronic acid functionalities were synthesized via free-radical copolymerization of styrylboronic acid and isoprene or myrcene. The polymerization proceeded with an identical boron incorporation to the comonomer feed in a 1,4-specific manner. The molecular weight (M_n) of the copolymer reached 46,000-110,000 g/mol, guaranteeing an adequate number of boronic acids in one polymer chain for cross-linking. To obtain a soluble copolymer, the concentration of styrylboronic acid monomer in THF/H₂O mixture solvent is important to prevent dehydrative boroxine formation during polymerization. The cross-linking driven by thermal dehydration-condensation of boronic acid moieties was confirmed by the increase in tensile modulus of the moldChemistry, an Asian journalSynthesis of Boronic Acid-Cross-Linked Diene-Based Polymers via Free-Radical Copolymerization.PMC12817154JPMJPR22N8Dolui SNakayama YTanaka RShiono TKawamoto MKihara SINishizono MfalseSynthesis of Boronic Acid-Cross-Linked Diene-Based Polymers via Free-Radical Copolymerization.Conjugated diene polymers cross-linked with boronic acid functionalities were synthesized via free-radical copolymerization of styrylboronic acid and isoprene or myrcene. The polymerization proceeded with an identical boron incorporation to the comonomer feed in a 1,4-specific manner. The molecular weight (M_n) of the copolymer reached 46,000-110,000 g/mol, guaranteeing an adequate number of boronic acids in one polymer chain for cross-linking. To obtain a soluble copolymer, the concentration of styrylboronic acid monomer in THF/H₂O mixture solvent is important to prevent dehydrative boroxine formation during polymerization. The cross-linking driven by thermal dehydration-condensation of boronic acid moieties was confirmed by the increase in tensile modulus of the mold2026-01-01T00:00:00Z2026 Jan2026-06-06T19:41:33.009Z2026-06-04T03:11:48.014ZS-EPMC128171544155615710.1002/asia.70572