Dielectric Polymers
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Anionic Aliphatic Polyesteramide Copolymers: Evaluation of Dielectric Properties
This study looks at the effects on the dielectric behavior as result of the incorporation of ester sequences along the nylon 6 chains. The aliphatic polyesteramide copolymers and nylon 6 homopolymer were synthesized via anionic ring-opening copolymerization using the rotational molding technique by varying the ratio of the ε-caprolactam (CLA) and ε-caprola
J. Braz. Chem. Soc.. Publicado em: 2015-02
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2. Propagação não linear de pulsos em estruturas 1D com band gap fotonico / Nonlinear pulse propagation in one-dimensional photonic band gap structures
The interaction of ultrashort optical pulses with photonic band gap materials has been studied by considering light propagation through one-dimensional photonic band gap structures, composed of a periodic multilayer stack of dielectric materials whose unitary cell consists of a pair of layers with different refractive indices n1and n2, respectively. One of t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/08/2009
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3. Polyphosphate hybrid materials: photochemistry, (di)electric characterization and its application in electrochemical capacitors / Materiais hÃbridos de polifosfatos: fotoquÃmica, caracterizaÃÃo (di)elÃtrica e sua utilizaÃÃo em capacitores eletroquÃmicos
The synergy between the properties of two substances, an organic and another inorganic, can be obtained in a single material by the sol-gel process. The low temperature processing allow the incorporation of organic substances in inorganic matrices. These hybrid materials can have covalent interactions between host and guest (C1), or weak interactions, like v
Publicado em: 2008
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4. Thermodynamic modeling of aqueous two phase systems containing salts and polymers. / Modelagem termodinâmica de sistemas aquosos bifásicos contendo sais e polímeros.
The thermodynamic modeling of phase equilibrium in aqueous two phase systems containing the neutral polymer poly(ethylene glycol) and a salt was studied in this work. The implemented model is based on the Pitzer equation for electrolytes solutions, modified in order to account for the influence of polymer properties in both the medium dielectric constant and
Publicado em: 2008
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5. CARACTERIZAÇÃO DE ATUADORES BASEADOS EM MÚSCULOS ARTIFICIAIS POLIMÉRICOS POR EFEITO CAPACITIVO / CHARACTERIZATION OF ACTUATORS BASED ON POLYMERIC ARTIFICIAL MUSCLES WITH CAPACITIVE EFFECT
It is well known the needs of finding new technologies for robotic systems actuations, with the same efficiency of the natural muscles. The common actuators have better agility and force when compared to natural muscles, but the dimensions and weight are bigger and for that the demand of energy necessary for the actuation is higher. Smaller and cheaper robot
Publicado em: 2007
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6. Relationship between the dielectric and mechanical properties and the ratio of epoxy resin to hardener of the hybrid thermosetting polymers
Foi investigada a relação entre as propriedades dielétricas (constante dielétrica, épsilon'; fator de perda, épsilon"; energia de ativação, Ea) e a proporção de resina epóxi (OG) para endurecedor em polímeros termorrígidos de resina epóxi (OG). A amplitude do pico de épsilon" decresce com o aumento da porcentagem em massa de OG até aproximada
Journal of the Brazilian Chemical Society. Publicado em: 2006-06
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7. Natural rubber modified clay nanocomposite pressure sensitive adhesive / Adesivos sensiveis a pressão a base de nanocompositos de borracha e argila
Pressure sensitive adhesives (PSA) are polymeric adhesives used for mainly in tapes and labels. Usually, there are 3 types of PSA: solvent based, water based and hot melt. Solvent based adhesives have few limitations, like flammability and toxicity, but they are still often used, due to their properties as good adhesion to polar substrates and good bonding w
Publicado em: 2006
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8. Aplicação da ressonancia de plasmon de superficie e da microbalança de cristal de quartzo na investigação de processos interfaciais visando o desenvolvimento de sensores / Applications of surface plasmon resonance and quartz crystal microbalance in the investigation of interface processes intending the sensors development
The present work describes the applications of surface plasmon resonance (SPR) and quartz crystal microbalance (QCM) in the investigation of interface processes in the attempt to improve the understanding and application of the investigated systems as well as the establishment of the applications of the SPR allied with electrochemical techniques. In this sen
Publicado em: 2006
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9. A new method for the study of charged transport in electric insulators. Application on polymers. / Corona com corrente constante: um novo método para o estudo de transporte de carga em isolantes. Aplicação em polímeros.
É apresentado neste trabalho um novo método de carga de filmes dielétricos com descarga corona, no qual a corrente de carga da amostra é mantida constante durante a deposição dos íons, enquanto o potencial de superfície é medido pela técnica do capacitor vibrante. O método foi aplicado no estudo de transporte e armazenamento de portadores em polí
Publicado em: 1982
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10. Soluble macromolecular complexes involving bacterial teichoic acids.
Cell wall and membrane teichoic acids from several bacteria formed soluble complexes with polysaccharides and bovine plasma in alkyl alcohol solutions. Polysaccharides which contain different monomeric units and anomeric configurations complexed with the teichoic acids, suggesting that the interaction is relatively nonspecific. Teichoic acids complexed glyco