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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
22/12/1999 |
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Data da última atualização: |
01/03/2010 |
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Autoria: |
MATTOSO, L. H. C.; MACDIARMID, A. G. |
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Afiliação: |
EMBRAPA-CNPDIA; University of Pennsylvania-Chemistry Department. |
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Título: |
Polyanilines, oxidation states. |
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Ano de publicação: |
1996 |
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Fonte/Imprenta: |
In: SALAMONE, J.C. (Ed.). Polymeric materials encyclopedia. Boca Raton: CRC, 1996. |
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Páginas: |
p. 5505-5513. |
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Idioma: |
Inglês |
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Conteúdo: |
First reports on the synthesis of aniline-based compounds are from the last century. Later polyaniline (PAni) was described as existing in four different oxidation states, each of which was an octamer. A few scattered papers appeared in the 1950s and 1960s on Pani oligomers and the electrochemical and FeCl3 oxidation of aniline. Until relatively, Pani, probably the oldest know synthetic organic polymer, consisted of an ill-defined class of materials obtained by the chemical or electrochemical oxidative polymerization of aniline. Early studies were fraught with problems of uncertain composition, and it was not until the mid-1980s the advent of better characterized materials that significant physical studies became possible. Polyanilines started to be extensively studies as conducting polymer after 1980, with several groups following suit during the following decade. The fascination of the conducting polymer community with this complex, challenging and potentially tecnologically important polymer system is due to its unique properties, in particular, ease of doping by protonic acids, stability in the doped and conductive state, solubility, and processability in the form of flexible high-strength films and fibers. Such characteristics have made PAni an outstanding conducting polymer with commercial viability in technological application such as rechargeable batteries, conductive coating on textiles, cable shielding, chemical sensors, electromagnetic shielding, electrical and electrochemical devices, and electrochromic displays. The term "polyaniline" as commonly employed, refers to a class of polymers of which the base form has the generalized composition and consists of alternating reduced (y), and oxidized (1-y), repeat units. (Structure !) In principle y can be varied continuosly from one, the completely reduced polymer, to zero to give the completely oxidized polymer (Structure 2 and 3). The terms leucoemeraldine, protoemeraldine, nigraniline, and pernigraniline, used in the following discussion will refer to the different oxidation states of the polymer where y=1, 0.75, 0.5, 0.25 and 0 respectively. These names apply to polymers either in the base form, such as emeraldine base or in the protonated salt form, such as emeraldine hydrochloride. Although, in principle, the oxidation staates can vary continuously, it will be shown that PAnis can exist in only three discrete oxidation states: leucoemeraldine, emeraldine and pernigraniline, the order oxidation states being a mixture of these. The imine nitrogen atoms in any of the species can be protonated in whole or in part to give the corresponding salts (doped form), the degree of protonation of the polymeric base depending on its oxidation state and on the pH of the aqueous acid. In this paper we present a brief review on the synthesis and doping of Panis in the various oxidation states and on the intercon version between the different oxidation states. MenosFirst reports on the synthesis of aniline-based compounds are from the last century. Later polyaniline (PAni) was described as existing in four different oxidation states, each of which was an octamer. A few scattered papers appeared in the 1950s and 1960s on Pani oligomers and the electrochemical and FeCl3 oxidation of aniline. Until relatively, Pani, probably the oldest know synthetic organic polymer, consisted of an ill-defined class of materials obtained by the chemical or electrochemical oxidative polymerization of aniline. Early studies were fraught with problems of uncertain composition, and it was not until the mid-1980s the advent of better characterized materials that significant physical studies became possible. Polyanilines started to be extensively studies as conducting polymer after 1980, with several groups following suit during the following decade. The fascination of the conducting polymer community with this complex, challenging and potentially tecnologically important polymer system is due to its unique properties, in particular, ease of doping by protonic acids, stability in the doped and conductive state, solubility, and processability in the form of flexible high-strength films and fibers. Such characteristics have made PAni an outstanding conducting polymer with commercial viability in technological application such as rechargeable batteries, conductive coating on textiles, cable shielding, chemical sensors, electromagnetic shielding, electrical and el... Mostrar Tudo |
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Palavras-Chave: |
Polianilinas. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03390naa a2200157 a 4500
001 1027106
005 2010-03-01
008 1996 bl --- 0-- u #d
100 1 $aMATTOSO, L. H. C.
245 $aPolyanilines, oxidation states.
260 $c1996
300 $ap. 5505-5513.
520 $aFirst reports on the synthesis of aniline-based compounds are from the last century. Later polyaniline (PAni) was described as existing in four different oxidation states, each of which was an octamer. A few scattered papers appeared in the 1950s and 1960s on Pani oligomers and the electrochemical and FeCl3 oxidation of aniline. Until relatively, Pani, probably the oldest know synthetic organic polymer, consisted of an ill-defined class of materials obtained by the chemical or electrochemical oxidative polymerization of aniline. Early studies were fraught with problems of uncertain composition, and it was not until the mid-1980s the advent of better characterized materials that significant physical studies became possible. Polyanilines started to be extensively studies as conducting polymer after 1980, with several groups following suit during the following decade. The fascination of the conducting polymer community with this complex, challenging and potentially tecnologically important polymer system is due to its unique properties, in particular, ease of doping by protonic acids, stability in the doped and conductive state, solubility, and processability in the form of flexible high-strength films and fibers. Such characteristics have made PAni an outstanding conducting polymer with commercial viability in technological application such as rechargeable batteries, conductive coating on textiles, cable shielding, chemical sensors, electromagnetic shielding, electrical and electrochemical devices, and electrochromic displays. The term "polyaniline" as commonly employed, refers to a class of polymers of which the base form has the generalized composition and consists of alternating reduced (y), and oxidized (1-y), repeat units. (Structure !) In principle y can be varied continuosly from one, the completely reduced polymer, to zero to give the completely oxidized polymer (Structure 2 and 3). The terms leucoemeraldine, protoemeraldine, nigraniline, and pernigraniline, used in the following discussion will refer to the different oxidation states of the polymer where y=1, 0.75, 0.5, 0.25 and 0 respectively. These names apply to polymers either in the base form, such as emeraldine base or in the protonated salt form, such as emeraldine hydrochloride. Although, in principle, the oxidation staates can vary continuously, it will be shown that PAnis can exist in only three discrete oxidation states: leucoemeraldine, emeraldine and pernigraniline, the order oxidation states being a mixture of these. The imine nitrogen atoms in any of the species can be protonated in whole or in part to give the corresponding salts (doped form), the degree of protonation of the polymeric base depending on its oxidation state and on the pH of the aqueous acid. In this paper we present a brief review on the synthesis and doping of Panis in the various oxidation states and on the intercon version between the different oxidation states.
653 $aPolianilinas
700 1 $aMACDIARMID, A. G.
773 $tIn: SALAMONE, J.C. (Ed.). Polymeric materials encyclopedia. Boca Raton: CRC, 1996.
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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Soja. Para informações adicionais entre em contato com valeria.cardoso@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
01/12/2020 |
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Data da última atualização: |
18/12/2020 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
BARROS, V. de A.; FONTESA, P. P.; SOUZA, G. B. de; GONÇALVES, A. B.; CARVALHO, K. de; RINCÃO, M. P.; LOPES, I. de O. N.; COSTA, M. D. L.; ALVES, M. S.; MARCELINO-GUIMARÃES, F. C.; FIETTO, L. G. |
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Afiliação: |
Vanessa de Almeida Barros, Universidade Federal de Viçosa, Viçosa, MG.; Patrícia Pereira Fontesa, Universidade Federal de Viçosa, Viçosa, MG.; Gilza Barcelos de Souza, Universidade Federal de Viçosa, Viçosa, MG.; Amanda Bonoto Gonçalves, Universidade Federal de Viçosa, Viçosa, MG.; Kenia de Carvalho, Universidade Estadual de Londrina, UEL, Londrina, PR.; Michelle Pires Rincão, Universidade Estadual de Londrina, UEL, Londrina, PR.; IVANI DE OLIVEIRA NEGRAO LOPES, CNPSO; Maximiller Dal-Bianco Lamas Costa, Universidade Federal de Viçosa, Viçosa, MG.; Murilo Siqueira Alves, Universidade Federal do Ceará, Fortaleza, CE.; FRANCISMAR CORREA MARCELINO GUIMARA, CNPSO; Luciano Gomes Fietto, Universidade Federal de Viçosa, Viçosa, MG. |
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Título: |
Phakopsora pachyrhizi triggers the jasmonate signaling pathway during compatible interaction in soybean and GmbZIP89 plays a role of major component in the pathway. |
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Ano de publicação: |
2020 |
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Fonte/Imprenta: |
Plant physiology and biochemistry, v. 151, p. 526-534, 2020. |
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Idioma: |
Inglês |
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Palavras-Chave: |
GmbZIP89. |
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Thesagro: |
Phakopsora Pachyrhizi; Soja. |
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Thesaurus NAL: |
Soybeans. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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Marc: |
LEADER 00896naa a2200277 a 4500
001 2127387
005 2020-12-18
008 2020 bl uuuu u00u1 u #d
100 1 $aBARROS, V. de A.
245 $aPhakopsora pachyrhizi triggers the jasmonate signaling pathway during compatible interaction in soybean and GmbZIP89 plays a role of major component in the pathway.$h[electronic resource]
260 $c2020
650 $aSoybeans
650 $aPhakopsora Pachyrhizi
650 $aSoja
653 $aGmbZIP89
700 1 $aFONTESA, P. P.
700 1 $aSOUZA, G. B. de
700 1 $aGONÇALVES, A. B.
700 1 $aCARVALHO, K. de
700 1 $aRINCÃO, M. P.
700 1 $aLOPES, I. de O. N.
700 1 $aCOSTA, M. D. L.
700 1 $aALVES, M. S.
700 1 $aMARCELINO-GUIMARÃES, F. C.
700 1 $aFIETTO, L. G.
773 $tPlant physiology and biochemistry$gv. 151, p. 526-534, 2020.
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