PAAm/CMC/nanoclay nanocomposite hydrogel: understanding the influence of initiators on the chain-growth mechanisms
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1007/s10965-022-03373-z http://hdl.handle.net/11449/249401 |
Resumo: | In 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. |
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PAAm/CMC/nanoclay nanocomposite hydrogel: understanding the influence of initiators on the chain-growth mechanismsCarboxymethylcelluloseChain-growth mechanismsClosite-Na+ nanoclayHeat investigationInitiatorsIn 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.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Grupo de Compósitos e Nanocompósitos Híbridos (GCNH) Programa de Pós-Graduação em Ciência dos Materiais São Paulo State University (Unesp) School of Engineering Ilha Solteira, SPGrupo de Compósitos e Nanocompósitos Híbridos (GCNH) Programa de Pós-Graduação em Ciência dos Materiais São Paulo State University (Unesp) School of Engineering Ilha Solteira, SPFAPESP: 2013/03643-0FAPESP: 2013/07296-2FAPESP: 2018/18697-1CNPq: 312414/2018-8CNPq: 312530/2018-8CNPq: 316174/2021-1CNPq: 405680/2016-3CAPES: 88887.310309/2018-00CAPES: 88887.310463/2018-00Universidade Estadual Paulista (UNESP)da Silva Fernandes, Renan [UNESP]Tanaka, Fabrício Cerizza [UNESP]Junior, Carlos Roberto Ferreira [UNESP]Yonezawa, Uilian Gabaldi [UNESP]de Moura, Márcia Regina [UNESP]Aouada, Fauze Ahmad [UNESP]2023-07-29T15:15:05Z2023-07-29T15:15:05Z2022-12-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1007/s10965-022-03373-zJournal of Polymer Research, v. 29, n. 12, 2022.1572-89351022-9760http://hdl.handle.net/11449/24940110.1007/s10965-022-03373-z2-s2.0-85142448696Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Polymer Researchinfo:eu-repo/semantics/openAccess2023-07-29T15:15:05Zoai:repositorio.unesp.br:11449/249401Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-05-23T11:53:31.414627Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
PAAm/CMC/nanoclay nanocomposite hydrogel: understanding the influence of initiators on the chain-growth mechanisms |
title |
PAAm/CMC/nanoclay nanocomposite hydrogel: understanding the influence of initiators on the chain-growth mechanisms |
spellingShingle |
PAAm/CMC/nanoclay nanocomposite hydrogel: understanding the influence of initiators on the chain-growth mechanisms da Silva Fernandes, Renan [UNESP] Carboxymethylcellulose Chain-growth mechanisms Closite-Na+ nanoclay Heat investigation Initiators |
title_short |
PAAm/CMC/nanoclay nanocomposite hydrogel: understanding the influence of initiators on the chain-growth mechanisms |
title_full |
PAAm/CMC/nanoclay nanocomposite hydrogel: understanding the influence of initiators on the chain-growth mechanisms |
title_fullStr |
PAAm/CMC/nanoclay nanocomposite hydrogel: understanding the influence of initiators on the chain-growth mechanisms |
title_full_unstemmed |
PAAm/CMC/nanoclay nanocomposite hydrogel: understanding the influence of initiators on the chain-growth mechanisms |
title_sort |
PAAm/CMC/nanoclay nanocomposite hydrogel: understanding the influence of initiators on the chain-growth mechanisms |
author |
da Silva Fernandes, Renan [UNESP] |
author_facet |
da Silva Fernandes, Renan [UNESP] Tanaka, Fabrício Cerizza [UNESP] Junior, Carlos Roberto Ferreira [UNESP] Yonezawa, Uilian Gabaldi [UNESP] de Moura, Márcia Regina [UNESP] Aouada, Fauze Ahmad [UNESP] |
author_role |
author |
author2 |
Tanaka, Fabrício Cerizza [UNESP] Junior, Carlos Roberto Ferreira [UNESP] Yonezawa, Uilian Gabaldi [UNESP] de Moura, Márcia Regina [UNESP] Aouada, Fauze Ahmad [UNESP] |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (UNESP) |
dc.contributor.author.fl_str_mv |
da Silva Fernandes, Renan [UNESP] Tanaka, Fabrício Cerizza [UNESP] Junior, Carlos Roberto Ferreira [UNESP] Yonezawa, Uilian Gabaldi [UNESP] de Moura, Márcia Regina [UNESP] Aouada, Fauze Ahmad [UNESP] |
dc.subject.por.fl_str_mv |
Carboxymethylcellulose Chain-growth mechanisms Closite-Na+ nanoclay Heat investigation Initiators |
topic |
Carboxymethylcellulose Chain-growth mechanisms Closite-Na+ nanoclay Heat investigation Initiators |
description |
In 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. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-12-01 2023-07-29T15:15:05Z 2023-07-29T15:15:05Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1007/s10965-022-03373-z Journal of Polymer Research, v. 29, n. 12, 2022. 1572-8935 1022-9760 http://hdl.handle.net/11449/249401 10.1007/s10965-022-03373-z 2-s2.0-85142448696 |
url |
http://dx.doi.org/10.1007/s10965-022-03373-z http://hdl.handle.net/11449/249401 |
identifier_str_mv |
Journal of Polymer Research, v. 29, n. 12, 2022. 1572-8935 1022-9760 10.1007/s10965-022-03373-z 2-s2.0-85142448696 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Polymer Research |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1803045898596384768 |