Sistemas nanoestruturados condutores baseados em nanocompósitos poliméricos condutores e mantas eletrofiadas condutoras
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/710 |
Resumo: | In this work its was investigated the influence of the processing on the electrical and dielectric properties of nanostructured polymeric systems obtained by differents techniques. The morphology and structure of the materials were correlated to their percolation threshold by applying the percolation theory. The systems studied were: i) conductive blends of poly(vinylidene fluoride) (PVDF) with polypyrrole (PPy), PVDF/ multiwall carbon nanotube (MWCNT) composites and PVDF/PPy/MWCNT hybrid systems, produced by melt mixing; ii) PVDF/ copper nanowires (CuNW) and MWCNT/PVDF nanocomposites produced by miscible solvent mixing and precipitation methods (MSMP); iii) nanofibers of nanocomposites of PA6/MWCNT, PVDF/MWCNT and PVDF/CuNW and from blends of PA6/ poly(aniline) (PAni) doped with p-toluene sulfonic acid (TSA), by electrospinning. For the systems produced by melt mixing the percolation thresholds were 10 and 0.3 wt %, for PVDF/PPy and PVDF/MWCNT, respectively, while the hybrid systems showed lower percolation thresholds and much higher electrical conductivities at all concentrations than the binary systems. For the systems produced by MSMP method the percolation thresholds were 0.13 and 0.29 v%, for the MWCNT/PVDF and CuNW/PVDF nanocomposites, respectively. It was observed also that the CuNW/PVDF nanocomposites had the highest real permittivity combined with a low dissipation factor (tan ). The non woven mats obtained by electrospinning presented insulating behavior. However, to take advantage of the high surface area and porosity of the mats the surface of the nanofibers were recovered with MWCNT by dipping the mats in an aqueous solution with MWCNT. A strong interaction between the MWNTs and the nanofibers was observed: even after ultrasonication, the adsorbed MWCNT remained attached to the surface of the nanofibers´ mats. After the treatment the mats displayed conductivities between 10-5 and 10-2 S/m. |
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Silva, Aline Bruna daBretas, Rosario Elida Sumanhttp://lattes.cnpq.br/2805349172281345http://lattes.cnpq.br/6539169612758835f40efe57-bff7-4d52-8a5c-f7c52282fe742016-06-02T19:10:18Z2013-09-202016-06-02T19:10:18Z2013-05-10SILVA, Aline Bruna da. Nanostructured polymeric systems based on conductive nanocomposites and conductive electrospun mats. 2013. 261 f. Tese (Doutorado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2013.https://repositorio.ufscar.br/handle/ufscar/710In this work its was investigated the influence of the processing on the electrical and dielectric properties of nanostructured polymeric systems obtained by differents techniques. The morphology and structure of the materials were correlated to their percolation threshold by applying the percolation theory. The systems studied were: i) conductive blends of poly(vinylidene fluoride) (PVDF) with polypyrrole (PPy), PVDF/ multiwall carbon nanotube (MWCNT) composites and PVDF/PPy/MWCNT hybrid systems, produced by melt mixing; ii) PVDF/ copper nanowires (CuNW) and MWCNT/PVDF nanocomposites produced by miscible solvent mixing and precipitation methods (MSMP); iii) nanofibers of nanocomposites of PA6/MWCNT, PVDF/MWCNT and PVDF/CuNW and from blends of PA6/ poly(aniline) (PAni) doped with p-toluene sulfonic acid (TSA), by electrospinning. For the systems produced by melt mixing the percolation thresholds were 10 and 0.3 wt %, for PVDF/PPy and PVDF/MWCNT, respectively, while the hybrid systems showed lower percolation thresholds and much higher electrical conductivities at all concentrations than the binary systems. For the systems produced by MSMP method the percolation thresholds were 0.13 and 0.29 v%, for the MWCNT/PVDF and CuNW/PVDF nanocomposites, respectively. It was observed also that the CuNW/PVDF nanocomposites had the highest real permittivity combined with a low dissipation factor (tan ). The non woven mats obtained by electrospinning presented insulating behavior. However, to take advantage of the high surface area and porosity of the mats the surface of the nanofibers were recovered with MWCNT by dipping the mats in an aqueous solution with MWCNT. A strong interaction between the MWNTs and the nanofibers was observed: even after ultrasonication, the adsorbed MWCNT remained attached to the surface of the nanofibers´ mats. After the treatment the mats displayed conductivities between 10-5 and 10-2 S/m.Neste trabalho foi investigada a influência do processamento nas propriedades elétricas e dielétricas de sistemas poliméricos nanoestruturados obtidos por diferentes técnicas. As morfologias e estruturas dos materiais produzidos foram correlacionadas à percolação elétrica dos mesmos, utilizando a teoria de percolação. Os sistemas estudados foram: i) Blendas de poli(fluoreto de vinilideno) (PVDF) e polipirrol (PPy), nanocompósitos de PVDF com nanotubos de carbono de paredes múltiplas (MWCNT) e do híbrido PVDF/PPy/MWCNT, todos obtidos a partir do estado fundido; ii) Nanocompósitos de PVDF com nanofibras de cobre (CuNW) e nanocompósitos de PVDF/MWCNT, obtidos pelo método de solubilização e posterior precipitação; iii) Nanofibras de nanocompósitos de Poliamida 6 (PA6) com MWCNT, PVDF/MWCNT, PVDF/CuNW e a partir da blenda de PA6/PAni, dopada com o ácido p-tolueno sulfônico (p-TSA), todas obtidas por eletrofiação. Para os compósitos PVDF/PPy e PVDF/MWCNT, produzidos a partir da mistura no estado fundido, o valor de percolação obtido foi de 10%m (ou 16,5 %vol) e 0,3 %m (ou 0,29 %vol), respectivamente. Enquanto, para o híbrido PVDF/PPy/MWCNT o valor de percolação elétrica para as cargas, individualmente, foi menor, e a condutividade elétrica obtida foi maior, comparado ao sistema binário. Para nanocompósitos PVDF/MWCNT e PVDF/CuNW, obtidos por solubilização e precipitação, o valor de percolação foi de 0,14%m (ou 0,13 % vol) e 1,36 %m (ou 0,27 % vol), respectivamente. E os nanocompósitos PVDF/CuNW apresentaram elevada permissividade elétrica combinada com baixos valores de dissipação elétrica, tan . Os resultados para condutividade elétrica das mantas não tecidas, obtidas por eletrofiação, mostraram que as mesmas têm comportamento isolante. Contudo, aproveitando as características singulares das mantas eletrofiadas (elevada área superficial e porosidade), foi realizado um tratamento para recobrir a superfície das nanofibras com MWCNT, mergulhando as mantas em uma dispersão aquosa de MWCNT. Foi observada uma forte interação entre os MWCNT e as nanofibras; mesmo com a utilização de intensa ultrasonicação os MWCNT continuaram bem aderidos a superfície das nanofibras. As mantas submetidas ao tratamento apresentaram condutividade elétrica entre 10-5 e 10-2 S/m.Financiadora de Estudos e Projetosapplication/pdfporUniversidade Federal de São CarlosPrograma de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEMUFSCarBRPolímerosNanocompósitosCondutividade elétricaEletrofiaçãoENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICASistemas nanoestruturados condutores baseados em nanocompósitos poliméricos condutores e mantas eletrofiadas condutorasNanostructured polymeric systems based on conductive nanocomposites and conductive electrospun matsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesis-1-1e983e14c-124c-422a-a96e-24e26346a86binfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINAL5427.pdfapplication/pdf36473708https://repositorio.ufscar.br/bitstream/ufscar/710/1/5427.pdf2eb5c1217fdc17b27dab041fc104ec3cMD51TEXT5427.pdf.txt5427.pdf.txtExtracted texttext/plain0https://repositorio.ufscar.br/bitstream/ufscar/710/2/5427.pdf.txtd41d8cd98f00b204e9800998ecf8427eMD52THUMBNAIL5427.pdf.jpg5427.pdf.jpgIM Thumbnailimage/jpeg7317https://repositorio.ufscar.br/bitstream/ufscar/710/3/5427.pdf.jpg28da1e4fb0110809c25eb93bf6a9eba5MD53ufscar/7102023-09-18 18:31:54.691oai:repositorio.ufscar.br:ufscar/710Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222023-09-18T18:31:54Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.por.fl_str_mv |
Sistemas nanoestruturados condutores baseados em nanocompósitos poliméricos condutores e mantas eletrofiadas condutoras |
dc.title.alternative.eng.fl_str_mv |
Nanostructured polymeric systems based on conductive nanocomposites and conductive electrospun mats |
title |
Sistemas nanoestruturados condutores baseados em nanocompósitos poliméricos condutores e mantas eletrofiadas condutoras |
spellingShingle |
Sistemas nanoestruturados condutores baseados em nanocompósitos poliméricos condutores e mantas eletrofiadas condutoras Silva, Aline Bruna da Polímeros Nanocompósitos Condutividade elétrica Eletrofiação ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
title_short |
Sistemas nanoestruturados condutores baseados em nanocompósitos poliméricos condutores e mantas eletrofiadas condutoras |
title_full |
Sistemas nanoestruturados condutores baseados em nanocompósitos poliméricos condutores e mantas eletrofiadas condutoras |
title_fullStr |
Sistemas nanoestruturados condutores baseados em nanocompósitos poliméricos condutores e mantas eletrofiadas condutoras |
title_full_unstemmed |
Sistemas nanoestruturados condutores baseados em nanocompósitos poliméricos condutores e mantas eletrofiadas condutoras |
title_sort |
Sistemas nanoestruturados condutores baseados em nanocompósitos poliméricos condutores e mantas eletrofiadas condutoras |
author |
Silva, Aline Bruna da |
author_facet |
Silva, Aline Bruna da |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://lattes.cnpq.br/6539169612758835 |
dc.contributor.author.fl_str_mv |
Silva, Aline Bruna da |
dc.contributor.advisor1.fl_str_mv |
Bretas, Rosario Elida Suman |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/2805349172281345 |
dc.contributor.authorID.fl_str_mv |
f40efe57-bff7-4d52-8a5c-f7c52282fe74 |
contributor_str_mv |
Bretas, Rosario Elida Suman |
dc.subject.por.fl_str_mv |
Polímeros Nanocompósitos Condutividade elétrica Eletrofiação |
topic |
Polímeros Nanocompósitos Condutividade elétrica Eletrofiação ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
description |
In this work its was investigated the influence of the processing on the electrical and dielectric properties of nanostructured polymeric systems obtained by differents techniques. The morphology and structure of the materials were correlated to their percolation threshold by applying the percolation theory. The systems studied were: i) conductive blends of poly(vinylidene fluoride) (PVDF) with polypyrrole (PPy), PVDF/ multiwall carbon nanotube (MWCNT) composites and PVDF/PPy/MWCNT hybrid systems, produced by melt mixing; ii) PVDF/ copper nanowires (CuNW) and MWCNT/PVDF nanocomposites produced by miscible solvent mixing and precipitation methods (MSMP); iii) nanofibers of nanocomposites of PA6/MWCNT, PVDF/MWCNT and PVDF/CuNW and from blends of PA6/ poly(aniline) (PAni) doped with p-toluene sulfonic acid (TSA), by electrospinning. For the systems produced by melt mixing the percolation thresholds were 10 and 0.3 wt %, for PVDF/PPy and PVDF/MWCNT, respectively, while the hybrid systems showed lower percolation thresholds and much higher electrical conductivities at all concentrations than the binary systems. For the systems produced by MSMP method the percolation thresholds were 0.13 and 0.29 v%, for the MWCNT/PVDF and CuNW/PVDF nanocomposites, respectively. It was observed also that the CuNW/PVDF nanocomposites had the highest real permittivity combined with a low dissipation factor (tan ). The non woven mats obtained by electrospinning presented insulating behavior. However, to take advantage of the high surface area and porosity of the mats the surface of the nanofibers were recovered with MWCNT by dipping the mats in an aqueous solution with MWCNT. A strong interaction between the MWNTs and the nanofibers was observed: even after ultrasonication, the adsorbed MWCNT remained attached to the surface of the nanofibers´ mats. After the treatment the mats displayed conductivities between 10-5 and 10-2 S/m. |
publishDate |
2013 |
dc.date.available.fl_str_mv |
2013-09-20 2016-06-02T19:10:18Z |
dc.date.issued.fl_str_mv |
2013-05-10 |
dc.date.accessioned.fl_str_mv |
2016-06-02T19:10:18Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
SILVA, Aline Bruna da. Nanostructured polymeric systems based on conductive nanocomposites and conductive electrospun mats. 2013. 261 f. Tese (Doutorado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2013. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/710 |
identifier_str_mv |
SILVA, Aline Bruna da. Nanostructured polymeric systems based on conductive nanocomposites and conductive electrospun mats. 2013. 261 f. Tese (Doutorado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2013. |
url |
https://repositorio.ufscar.br/handle/ufscar/710 |
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por |
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por |
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e983e14c-124c-422a-a96e-24e26346a86b |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
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Universidade Federal de São Carlos |
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Programa de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEM |
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UFSCar |
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BR |
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Universidade Federal de São Carlos |
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