Conductive Polymers
Mostrando 13-24 de 26 artigos, teses e dissertações.
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13. Blendas de polianilina e poliestireno obtidas por processamento reativo : preparação e caracterização
One of the major current objectives in the research of intrinsically conducting polymers (PIC) is the production of blends, which combine the processing properties of common thermoplastic polymers with the conductivity of conducting polymers. The main problem in applying PIC in large scale in the plastic industry has been the infusibility of these polymers,
Publicado em: 2002
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14. Síntese de polímeros condutores em matrizes sólidas hospedeiras
This review discusses the methods used to prepare conductive polymers in confined environments. This spatial restriction causes formation of defect-free polymer chains in the interlayer as porous cavities of inorganic hosts. The properties of the different composites obtained are a synergist combination of the characteristics of the inorganic host and the po
Química Nova. Publicado em: 2000-04
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15. Dispositivo de armazenamento de energia utilizando polianilina e eletrolito polimerico
Recently, supercapacitors or electrochemical capacitors have brought renewed interest in the area of energy storage because of possible application in electric vehicles and electronic devices. The developments in this area require energy storage with a high density and short charge discharge times. Conductive polymers have advantages over metal oxides as ele
Publicado em: 2000
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16. Sintese da polianilina em escala piloto e seu processamento
The interest in polyaniline (PAni) comes from the fact that polymers obtained from aromatic derivatives containing nitrogen linked to the ring can be easily synthesized and each derivative may exist jn several distinct oxidation states, also they can be "doped" by different dopants by non redox, as well as by partial chemical or electrochemical oxidation. Th
Publicado em: 2000
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17. Simulação de condutividade alternada em sistemas poliméricos e aplicações em poliméricos condutivos / Simulation of alternated conductivity, in polymeric systems and applications in conductive polymers
Os processos envolvidos em condução eletrônica de polímeros condutores são muito complicados devido à intricada morfologia estrutural de tais materiais. Realizamos medidas de condutividade alternada em filmes de polianilina em uma grande faixa de freqüência, variando o grau de dopagem dos filmes e temperatura. Ao mesmo tempo, desenvolvemos um modelo
Publicado em: 2000
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18. Preparação e caracterização da poli(o-metoxianilina) dopada com acidos funcionalizados e sua utilização em aplicaçõesde interesse tecnologico
Organic conducting polymers present several characteristics, such as: electroactivity, electrochromism and electrical conductivity, which qualify them for using in technological applications. Among these polymers, polyaniline and its derivatives have attracted great interest due to their environmental stability and low cost of preparation. However, the lack
Publicado em: 1998
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19. Studies in films of Poly(terephtalate of ethylene) re-covered with conducting Polyaniline. / Estudos em filmes de Poli (tereftalato de etileno) recoberto com polianilina condutora.
Composites with conductive properties have been proposed as materiais in which different physical properties of polymers are combined. In this work a composite consisting of surface layers of polyaniline, PANI, deposited on films of poly(ethylene terephtalate), PET, were prepared. In order to deposit the PANI the PET film were immersed in the solution in whi
Publicado em: 1998
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20. Propriedades elétricas e físico-químicos de blendas de poli (sulfeto de p-fenileno) - pps com um cristal líquido polimérico (LCP) / Electrical and physical chemistry properties of poli (p-phenylene sulfide) with a liquid crystal polymer
Poly (p-phenylene sulphide) (PPS) is an engineering thermoplastic, with high thermal and chemical resistance, and. with a growing industrial importance, due to its easy processability in the form of films, fiaments and injection molded articles. It also can be chemically doped and. therefore be a conductive polymer (σ = 10 S/cm, by doping with AsF5); ho
Publicado em: 1997
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21. Blendas de polipirrol e poli(cloreto de vinila) : propriedades termicas, mecanicas e eletroquimicas
Blends including an intrinsically conductive polymer, polypyrrole or polythiophene, and an insulating polymer, PVC, were prepared. The method used was the oxidative chemical polymerization of the heterocyclic monomers, in the vapor phase, in PVC films impregnated with an oxidant agent (FeCl3). This procedure was efficient for the preparation of blends compos
Publicado em: 1995
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22. Sintese, propriedades e aplicações do poli-pirrol dopado com anions anfifilicos
Research on intrinsically conducting polymers has grown in the last years due their potential technological applications. They can be reversively driven to their conductive or insulator states by a redox process. This involves the introduction or ions into the material in order to maintain the charge eletroneutrality and, generally, occurs during polymer syn
Publicado em: 1992
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23. Propriedades eletroquimicas e eletrocromicas de poli(anilina) preparada quimicamente
Poly(aniline), PANI, is known since the last century. It is one of the most stable and attractive conducting polymers. PANI is generally prepared by oxidation of aniline in acid medium, using a chemical oxidant or by electrochemical oxidation. For technological purposes and large scale synthesis the chemical method is more adequate. As a consequence, in this
Publicado em: 1991
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24. Conductive polymers derived from iron, ruthenium, and osmium metalloporphyrins: The shish-kebab approach
The synthesis and characterization of pyrazine-bridged polymers of iron(II/III), ruthenium(II/III), and osmium(II/III) octaethylporphyrin (dubbed “shish-kebab” polymers) are presented. Optical and dc conductivity measurements reveal that the ruthenium and osmium polymers, when partially oxidized, are highly conductive. Electrochemical and ESR results are