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Static light scattering monitoring and kinetic modeling of polyacrylamide hydrogel synthesis

2019Artigo científico Acesso aberto
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dc.contributor.authorGomes, Catarina
dc.contributor.authorDias, Rolando
dc.contributor.authorCosta, Mário Rui
dc.date.accessioned2019-12-09T16:18:26Z
dc.date.available2019-12-09T16:18:26Z
dc.date.issued2019
dc.description.abstractA kinetic model describing aqueous acrylamide homopolymerization and copolymerization of acrylamide with methylene bisacrylamide, leading to hydrogel formation, is presented and applied in the simulation of these reaction processes. This modeling approach is based on population balances of generating functions and, besides the crosslinking mechanisms inherent to network formation, other specific kinetic steps important in acrylamide polymerization (e.g., branching due to backbiting) are considered in the simulation tool developed. The synthesis of acrylamide polymers and hydrogels was performed at 26 C and at 40 C using two di erent initiation systems. The formation of such materials was monitored using in-line static light scattering (SLS), and the spatial inhomogeneity of the final hydrogels was also measured using this experimental technique. It is shown that the simulations are helpful in describing information provided by SLS in-line monitoring, namely in the early stages of polymerization with the transition from dilute to semi-dilute regime. Indeed, it finds a plausible match between the critical overlap polymer concentration and gelation, this later leading to the observed spatial heterogeneity of the hydrogels. Usefulness of the kinetic model for defining operation conditions (initial composition, semi-batch feed policies, chain transfer, etc.) in making the shift from gelation to the semi-dilute regime is discussed, and the extension of this approach to processes enabling a higher control of gelation (e.g., controlled radical polymerization) is also prospected.pt_PT
dc.description.sponsorshipThis research was funded by project AIProcMat@N2020 (NORTE-01-0145-FEDER-000006) and project POCI-01-0145-FEDER-006984—Associate Laboratory LSRE-LCM.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationGomes, Catarina P.; Dias, Rolando; Costa, Mário Rui (2019). Static light scattering monitoring and kinetic modeling of polyacrylamide hydrogel synthesis. Processes. ISSN 2227-9717. 7:4, p. 1-24pt_PT
dc.identifier.doi10.3390/pr7040237pt_PT
dc.identifier.eissn2227-9717
dc.identifier.urihttp://hdl.handle.net/10198/19907
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/pt_PT
dc.subjectWater-soluble polymerspt_PT
dc.subjectHydrogelspt_PT
dc.subjectSpatial inhomogeneitypt_PT
dc.subjectLight scatteringpt_PT
dc.subjectKinetic modelingpt_PT
dc.titleStatic light scattering monitoring and kinetic modeling of polyacrylamide hydrogel synthesispt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.issue4pt_PT
oaire.citation.startPage237pt_PT
oaire.citation.titleProcessespt_PT
oaire.citation.volume7pt_PT
person.familyNameGomes
person.familyNameDias
person.givenNameCatarina P.
person.givenNameRolando
person.identifier.ciencia-id2B12-75A1-B8FB
person.identifier.ciencia-id8417-4D84-973B
person.identifier.orcid0000-0003-3396-3615
person.identifier.orcid0000-0001-7369-382X
person.identifier.ridM-8552-2013
person.identifier.scopus-author-id57190981477
person.identifier.scopus-author-id7102885104
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationeeffa916-1197-416e-a4fd-22281823df55
relation.isAuthorOfPublicationd7109687-6adf-4268-a462-8d1a2e2c01cb
relation.isAuthorOfPublication.latestForDiscoveryeeffa916-1197-416e-a4fd-22281823df55

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