PAAm/CMC/nanoclay nanocomposite hydrogel: understanding the influence of initiators on the chain-growth mechanisms

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dc.contributor.authorda Silva Fernandes, Renan [UNESP]
dc.contributor.authorTanaka, Fabrício Cerizza [UNESP]
dc.contributor.authorJunior, Carlos Roberto Ferreira [UNESP]
dc.contributor.authorYonezawa, Uilian Gabaldi [UNESP]
dc.contributor.authorde Moura, Márcia Regina [UNESP]
dc.contributor.authorAouada, Fauze Ahmad [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.date.accessioned2023-07-29T15:15:05Z
dc.date.available2023-07-29T15:15:05Z
dc.date.issued2022-12-01
dc.description.abstractIn this study, heat measurements were used to investigate the influence of three initiators on the chain-growth mechanisms of polyacrylamide/carboxymethylcellulose/nanoclay nanocomposite hydrogels. All the matrices had highly interconnected porous surfaces with intercalated configurations. Swelling degree measurements were conducted to investigate the effect of the various formed chains on the physicochemical properties of these matrices. According to the findings, hydrogels synthesized using a potassium persulfate initiator had the highest water absorbency (around 40.8 ± 0.8 g.g^−1), followed by those synthesized using sodium persulfate (38.1 ± 1.0 g.g^−1) and ammonium persulfate initiators (34.8 ± 0.7 g.g^−1). The nanoclay-containing nanocomposite had a similar water absorption tendency. Additionally, all the nanocomposites had a lower swelling degree than pure hydrogel because nanoclay acted as a physical crosslinker in the polymeric matrix, decreasing the chain elasticity and water sorption ability. Different physicochemical properties were then generated due to the difference in polymerization mechanisms. Chain combination was the preferred termination mechanism for the polymerization of the hydrogel with the highest water absorbency. It was also plausible to assume that chain transfer reactions favored the termination mechanisms of the polymerization of the nanocomposites synthesized using NaPS and APS initiators, generating polymeric chains with low molecular weight and reducing the water absorption capacity. The insertion of nanoclay inhibited the start of the polymerization initiation step by preventing the initiator from attacking the monomer. Thus, a better understanding of the interaction between the initiators and hydrogel components can aid in the synthesis of hybrid nanocomposites with desirable characteristics and properties.en
dc.description.affiliationGrupo de Compósitos e Nanocompósitos Híbridos (GCNH) Programa de Pós-Graduação em Ciência dos Materiais São Paulo State University (Unesp) School of Engineering Ilha Solteira, SP
dc.description.affiliationUnespGrupo de Compósitos e Nanocompósitos Híbridos (GCNH) Programa de Pós-Graduação em Ciência dos Materiais São Paulo State University (Unesp) School of Engineering Ilha Solteira, SP
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipIdFAPESP: 2013/03643-0
dc.description.sponsorshipIdFAPESP: 2013/07296-2
dc.description.sponsorshipIdFAPESP: 2018/18697-1
dc.description.sponsorshipIdCNPq: 312414/2018-8
dc.description.sponsorshipIdCNPq: 312530/2018-8
dc.description.sponsorshipIdCNPq: 316174/2021-1
dc.description.sponsorshipIdCNPq: 405680/2016-3
dc.description.sponsorshipIdCAPES: 88887.310309/2018-00
dc.description.sponsorshipIdCAPES: 88887.310463/2018-00
dc.identifierhttp://dx.doi.org/10.1007/s10965-022-03373-z
dc.identifier.citationJournal of Polymer Research, v. 29, n. 12, 2022.
dc.identifier.doi10.1007/s10965-022-03373-z
dc.identifier.issn1572-8935
dc.identifier.issn1022-9760
dc.identifier.scopus2-s2.0-85142448696
dc.identifier.urihttp://hdl.handle.net/11449/249401
dc.language.isoeng
dc.relation.ispartofJournal of Polymer Research
dc.sourceScopus
dc.subjectCarboxymethylcellulose
dc.subjectChain-growth mechanisms
dc.subjectClosite-Na+ nanoclay
dc.subjectHeat investigation
dc.subjectInitiators
dc.titlePAAm/CMC/nanoclay nanocomposite hydrogel: understanding the influence of initiators on the chain-growth mechanismsen
dc.typeArtigo
unesp.author.orcid0000-0002-6870-6961[6]
unesp.departmentFísica e Química - FEISpt

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Ilha Solteira - FEIS - Faculdade de Engenharia