Preparação e caracterização de nanocompósitos poliméricos baseados em quitosana e argilo minerais

Fiori, Ana Paula Santos de Melo; Gabiraba, Victor Parizio; Praxedes, Ana Paula Perdigão; Nunes, Marcelo Ramon da Silva; Balliano, Tatiane Luciano; Silva, Rosanny Christhinny da; Tonholo, Josealdo; Ribeiro, Adriana S.

doi:10.1590/0104-1428.1572

Cited by 13 publications

(9 citation statements)

References 32 publications

(45 reference statements)

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“…Fiori et al [35] também observaram que a adição de plastificantes melhorou a flexibilidade do filmes de quitosana e que a adição de argila bentonita na matriz polimérica resultou em um filme mais resistente. Na Tabela 2 são apresentadas os valores para a taxa de permeação ao vapor de água (TPVA) e a permeação ao vapor de água (PVA) dos filmes de quitosana.…”

Section: Resultsunclassified

Desenvolvimento e caracterização de filmes compósitos de quitosana e zeólitas com prata

et al. 2015

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ResumoZeólitas foram submetidas à troca iônica ou impregnação com prata e posteriormente adicionadas em filmes de quitosana para a confecção de curativos para queimaduras. As zeólitas foram avaliadas por Ressonância magnética nuclear (RMN), Fluorescência de raios X por reflexão total (TXRF), Microscopia eletrônica de varredura (MEV). Os filmes poliméricos foram analisados com relação às suas propriedades mecânicas, permeabilidade ao vapor d'água (PVA) e liberação de prata. Observou-se que o procedimento de troca iônica não alterou a morfologia das zeólitas de partida. Grumos de zeólita foram observados nas micrografias dos filmes e estes influenciaram nas propriedades mecânicas devido à desorganizaçao local no empacotamento das cadeiras poliméricas da quitosana. A metodologia de troca iônica ou impregnação influenciou diretamente na quantidade de prata presente superficialmente na zeólita e consequentemente alterou o perfil de liberação de prata em uma solução simulada de exudato de ferida. Os modelos cinéticos sugeriram que a liberação da prata não foi essencialmente regulada pela lei de difusão de Fick. Palavras-chave: impregnação, troca-iônica, curativos para queimados, zeólita Y. AbstractZeolites were subjected to ion exchange or impregnation with silver and added to chitosan films for producing burns dressings. Zeolites were characterized by nuclear magnetic resonance (NMR), total reflection X-ray fluorescence (TXRF), scanning electron microscopy (SEM). The polymer films were analyzed with respect to their mechanical properties, water vapor permeability (WVP), and release of silver. It was observed that the ion exchange did not modify the morphology of the starting zeolite. Clusters of zeolite were observed in the micrographs of the films and they influenced the mechanical properties due to local disruption in the packing of the polymer chains of chitosan. The methodology of ion exchange or impregnation directly influenced the amount of silver present in the zeolite surface and consequently changed the silver release profile in an of simulated exudate fluid. The kinetic models suggested that the release of the silver was not primarily governed by Fick's law of diffusion.

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Section: Resultsunclassified

Desenvolvimento e caracterização de filmes compósitos de quitosana e zeólitas com prata

et al. 2015

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“…The technological adaption of biomaterials, particularly polymers, for the development of flexible films has been widely studied in recent years [4][5][6] . Several biopolymers such as polysaccharides, proteins, and lipids have been utilized as polymeric matrixes for the development of alternative biodegradable packaging, owing to their availability, renewability, low cost, environmental friendliness, and biodegradability [7][8][9] .…”

Section: Introductionmentioning

confidence: 99%

Production of biodegradable starch nanocomposites using cellulose nanocrystals extracted from coconut fibers

et al. 2017

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“…In this temperature range, the highest depolymerization rate for chitosan was recorded. Other authors reported the peak depolymerization temperature for chitosan in the range of 305–320 °C [ 34 , 49 , 50 ]. Besides depolymerization, the cracking and dehydration reactions of the saccharide ring and decomposition of the acetyl groups may also have taken place [ 34 , 50 ].…”

Section: Resultsmentioning

confidence: 99%

Non-Supported and PET-Supported Chitosan Membranes for Pervaporation: Production, Characterization, and Performance

et al. 2022

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The objective of this study was to develop non-supported and PET-supported chitosan membranes that were cross-linked with glutaraldehyde, then evaluate their physical–chemical, morphological, and mechanical properties, and evaluate their performance in the separation of ethanol/water and limonene/linalool synthetic mixtures by hydrophilic and target-organophilic pervaporation, respectively. The presence of a PET layer did not affect most of the physical-chemical parameters of the membranes, but the mechanical properties were enhanced, especially the Young modulus (76 MPa to 398 MPa), tensile strength (16 MPa to 27 MPa), and elongation at break (7% to 26%), rendering the supported membrane more resistant. Regarding the pervaporation tests, no permeate was obtained in target-organophilic pervaporation tests, regardless of membrane type. The support layer influenced the hydrophilic pervaporation parameters of the supported membrane, especially in reducing transmembrane flux (0.397 kg∙m−2∙h−1 to 0.121 kg∙m−2∙h−1) and increasing membrane selectivity (611 to 1974). However, the pervaporation separation index has not differed between membranes (228 for the non-supported and 218 for the PET-supported membrane), indicating that, overall, both membranes had a similar performance. Thus, the applicability of each membrane is linked to specific applications that require a more resistant membrane, greater transmembrane fluxes, and higher selectivity.

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Preparação e caracterização de nanocompósitos poliméricos baseados em quitosana e argilo minerais

Cited by 13 publications

References 32 publications

Desenvolvimento e caracterização de filmes compósitos de quitosana e zeólitas com prata

Desenvolvimento e caracterização de filmes compósitos de quitosana e zeólitas com prata

Production of biodegradable starch nanocomposites using cellulose nanocrystals extracted from coconut fibers

Non-Supported and PET-Supported Chitosan Membranes for Pervaporation: Production, Characterization, and Performance

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