Oligomer
Mostrando 1-12 de 729 artigos, teses e dissertações.
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1. SPECTROSCOPIC CHARACTERIZATION OF PEDOT:PSS CONDUCTING POLYMER BY RESONANCE RAMAN AND SERRS SPECTROSCOPIES
Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) synthesis was monitored by resonance Raman (RR) and surface-enhanced resonance Raman scattering (SERRS) spectroscopies and both the oxidation of the polymer and the effects of chain length were assessed by vibrational analysis. It was supported by theoretical models of oligomers, with charge
Quím. Nova. Publicado em: 05/12/2019
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2. Investigation on Structural, Morphological and Relaxometric Properties of Lamellar Zrp Modified with Long Chain Amine
In order to search nanofiller for controlling release of drugs lamellar α-zirconium phosphate (α-ZrP) was modified with ether-amine oligomer (E-A). Synthesis and chemical modification followed specific reaction conditions and different EA:ZrP ratios. Infrared spectra showed strong interaction between P-OH and NH2 groups. Thermogravimetric curves showed tha
Mat. Res.. Publicado em: 17/01/2019
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3. Crystallization, thermal and mechanical behavior of oligosebacate plasticized poly(lactic acid) films
Abstract The biodegradable aliphatic oligoester oligo(trimethylene separate) (OTS) was synthesized by polycondensation and used to plasticize poly(lactic acid) (PLA). Casting films of PLA and PLA/OTS with concentrations of 1, 5 and 10 wt.% were prepared, and these films were characterized by thermal analyses, crystallinity, rheology and mechanical tests. DS
Polímeros. Publicado em: 29/11/2018
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4. Chrysosplenetin, in the absence and presence of artemsininin, alters breast cancer resistance protein-mediated transport activity in Caco-2 cell monolayers using aristolochic acid I as a specific probe substrate
ABSTRACT The present study describes the impact of chrysosplenetin, in the absence and presence of artemisinin, on in vitro breast cancer resistance protein-mediated transport activity in Caco-2 cell monolayers using aristolochic acid I as a specific probe substrate. We observed that novobiocin, a known breast cancer resistance protein active inhibitor, incr
Rev. bras. farmacogn.. Publicado em: 2017-12
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5. Unraveling the Role of Π - Conjugation in Thiophene Oligomers for Optoelectronic Properties by DFT/TDDFT Approach
ABSTRACT Thiophene oligomer has been investigated using DFT/TDDFT calculations with an aim to check its suitability for opto electronic applications and also to analyse the influence of π-bridge. Our results revealed that thiophene oligomers have excellent π-conjugation throughout. FMO analysis give an estimate of band gap of thiophene oligomer and further
Braz. arch. biol. technol.. Publicado em: 23/01/2017
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6. Synthesis and Characterization of a New Semiconductor Oligomer Having Quinoline and Fluorene Units
Um novo material contendo grupos fluoreno e quinolina foi obtido por síntese direta através da reação de Suzuki e mostrou-se ser facilmente solúvel em solventes orgânicos comuns. A estrutura química da macromolécula foi confirmada através da caracterização por medidas de ressonância magnética nuclear
J. Braz. Chem. Soc.. Publicado em: 2015-01
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7. Study of the effects of lanthanum and the iron ion on the acidic properties of Al-pillared vermiculite
The synthesis of porous materials has attracted interest for decades due to their applications in catalysis and gas adsorption. Clay obtained by insertion of mesoporous oligomer [La xAl13-xO4 (OH)24 (H2O)12]7 + (where x equals the molar amount of lanthanum), followed by calcination, may cause variation in the acidic properties. The analyzes showed that incre
Mat. Res.. Publicado em: 05/07/2013
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8. Estrutura eletrÃnica e propriedades espectroscÃpicas de compÃsitos polianilina/ouro: uma investigaÃÃo ab initio
In this dissertation we use ab initio quantum chemistry theoretical methods to examine possible effects that the presence of a small number of attached gold atoms could have upon the spectra of polyaniline (PANI) oligomers. We have investigated in special the theoretical fluorescence spectra of the gold-polyaniline composites, by using the Hartree-Fock appro
Publicado em: 2009
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9. Electrosynthesis and characterizations of polypyrrole-2-carboxylic acid for application as amperometric biosensor constructed in microelectrodes / Eletrossíntese e caracterização de filmes de polipirrol-2-ácido carboxílico para uso em biossensores amperométricos construídos em eletrodos miniaturizados
In this work, we present the electrochemical synthesis of a new conducting polymer derived of polypyrrole (PPI) functionalized by carboxylic group, the polypyrrole-2-carboxylic acid, and its application as amperometric transducer in biosensor by use of polyphenol oxidase (PFO). All the steps of syntheses and characterization of the polymer film in microelect
Publicado em: 2009
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10. Estudo da fotopolimerização e degradação de um oligomero uretano acrilado alifatico para aplicação em revestimentos para madeira / Study of the photopolimerization and degradation of an aliphatic acrilate urethane oligomer for application in coatings for wood
Vernizes obtidos por tecnologia de cura ultravioleta têm um grande campo de aplicação em revestimentos para madeira, sendo por isto bastante usada na Indústria Moveleira. Além disto, esta tecnologia é hoje importante do ponto de vista ambiental por ser considerada uma tecnologia limpa, já que sua formulação é livre de solvente, sendo considerada ze
Publicado em: 2008
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11. Leucil-aminopeptidase recombinante de L. interrogans
Screening proteolytic activities in non-pathogenic and as well in pathogenic bacteria of the genus Leptospira, we identified the presence of aminopeptydolitic activity in the latter only. Aiming at clarification of this finding, this work led to the biochemical characterization of the enzyme which appears to be responsible for the leucyl-aminopeptydase activ
Publicado em: 2008
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12. Polissiloxanos polissilazanos como precursores de materiais ceramicos e suas aplicacões na obtenção de compositos de matriz ceramica
In this work different preceramic polymers, as polysiloxane and polysilazane were prepared, and their conversions by controlled pyrolysis to silicon oxycarbide (SiOC) and silicon carbonitride (SiCN) glasses, respectively, were studied. The polysiloxane was prepared from 1,3,5,7-tetravinyl-1,3,5,7-tetramethylciclotetrasiloxane and 1,3,5,7-tetramethyl-1,3,5,7-
Publicado em: 2002