Superabsorbent hydrogels made from bio-sourced butyrolactone monomer in aqueous solution

dc.contributor.authorLuk, Sharmaine B.en
dc.contributor.authorKollár, Jozefen
dc.contributor.authorChovancová, Annaen
dc.contributor.authorMrlík, Miroslaven
dc.contributor.authorLacík, Igoren
dc.contributor.authorMosnáček, Jaroslaven
dc.contributor.authorHutchinson, Robin Aen
dc.descriptionFinal publication available at:
dc.description.abstractA new water-soluble monomer, sodium 4-hydroxy-4-methyl-2-methylene butanoate (SHMeMB), formed by saponification of the bio-derived monomer γ-methyl-α-methylene-γ-butyrolactone (MeMBL), was copolymerized with acrylamide (AM) in aqueous solution to make superabsorbent hydrogels with equilibrium degree of swelling in the range of 6700–59 000%, depending on monomer ratio and crosslink density. Mechanical strength and storage and loss moduli of the hydrogels were tunable over a wide range through adjustment of the comonomer composition and the crosslinker content. Monomer reactivity ratios of rSHMeMB = 0.12–0.17 and rAM = 0.95–1.10 were determined using copolymer compositions measured at low monomer conversion as well as by applying the integrated form of the Mayo-Lewis equation to fit the drift in comonomer composition with conversion. The reactivity of the SHMeMB : AM system was lower than that of the previously-studied SHMB : AM system, with sodium 4-hydroxy-2-methylene butanoate (SHMB) derived from a similar renewable monomer, α-methylene-γ-butyrolactone (MBL). The differences in reactivity were studied by pulsed laser polymerization coupled with size exclusion chromatography; the comonomer-averaged propagation rate coefficient of the SHMB : AM system was found to be more than double that of SHMeMB : AM, with first estimates for the SHMeMB and SHMB homopropagation rate coefficients of 25 and 165 L mol−1 s−1, respectively, at 60 °C. Despite its lower reactivity, SHMeMB offers advantages over SHMB due to its availability and as superior overall properties of the final hydrogels were achieved.en
dc.identifier.citationLuk, S. B., Kollár, J., Chovancová, A., Mrlík, M., Lacík, I., Mosnáček, J., & Hutchinson, R. A. (2017). Superabsorbent hydrogels made from bio-sourced butyrolactone monomer in aqueous solution. Polym. Chem., 8(39), 6039–6049. doi:10.1039/c7py01397cen
dc.publisherRoyal Society of Chemistry (RSC)en
dc.titleSuperabsorbent hydrogels made from bio-sourced butyrolactone monomer in aqueous solutionen
dc.typejournal articleen
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