Gotowe bibliografie tematyczne / Silsesquioxane

Gotowa bibliografia na temat „Silsesquioxane”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 10 marca 2023

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Artykuły w czasopismach na temat "Silsesquioxane"

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Mori, Hideharu. "Design and Synthesis of Functional Silsesquioxane-Based Hybrids by Hydrolytic Condensation of Bulky Triethoxysilanes". International Journal of Polymer Science 2012 (2012): 1–17. http://dx.doi.org/10.1155/2012/173624.

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This paper presents a short overview of recent advances in the design and synthesis of organic-inorganic hybrids using silsesquioxane-based nanoparticles having nanometer size, relatively narrow size distribution, high functionalities, and various characteristic features, mainly focusing on our recent researches related to the subject. A highlight of this paper is the water-soluble silsesquioxane-based nanoparticles, including hydroxyl-functionalized and cationic silsesquioxanes, which were synthesized via the one-step condensation of the bulky triethoxysilane precursors. The design and synthesis of R-SiO1.5/SiO2and R-SiO1.5/TiO2hybrids by hydrolytic cocondensation of a triethoxysilane precursor and metal alkoxides are briefly introduced. This paper also deals with recent results in stimuli-responsive hybrids based on the water-soluble silsesquioxane nanoparticles and fluorinated and amphiphilic silsesquioxane hybrids.
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Lichtenhan, Joseph D., Ngo Q. Vu, Jason A. Carter, Jeffrey W. Gilman i Frank J. Feher. "Silsesquioxane-siloxane copolymers from polyhedral silsesquioxanes". Macromolecules 26, nr 8 (kwiecień 1993): 2141–42. http://dx.doi.org/10.1021/ma00060a053.

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Brząkalski, Dariusz, Robert E. Przekop, Bogna Sztorch, Paulina Jakubowska, Marek Jałbrzykowski i Bogdan Marciniec. "Silsesquioxane Derivatives as Functional Additives for Preparation of Polyethylene-Based Composites: A Case of Trisilanol Melt-Condensation". Polymers 12, nr 10 (2.10.2020): 2269. http://dx.doi.org/10.3390/polym12102269.

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In this work, polyethylene (PE) composites were prepared with a series of completely condensed silsesquioxanes (SSQ), as well as with open-cage hepta(isobutyl)trisilanol silsesquioxane. The effect of the additives on the thermal, mechanical, rheological, and crystalline properties of the composites obtained was determined. The dispersion of trisilanol derivative within polymer matrix was slightly better than that of the other isobutyl compounds, suggesting condensation of the additive to less polar products of different structure, which was confirmed by thermogravimetry (TG) and matrix-assisted laser desorption-ionization time-of-flight (MALDI-TOF) mass spectrometry analysis. The additives improved the thermal stability of polyethylene and formed composites of higher rigidity than the neat polyolefin. The results were compared to the literature data, with aminopropylhepta(isobutyl)silsesquioxane and vinylhepta(isobutyl)silsesquioxane being used partially as references, as PE composites thereof were reported earlier, but lacked some analytical results and required further investigation. It was proven that the practical upper loading limit for such silsesquioxane compounds as processing and functional additives for polyethylene should be fixed at around 1%.
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Szołyga, Mariusz, Michał Dutkiewicz, Marek Nowicki, Kamila Sałasińska, Maciej Celiński i Bogdan Marciniec. "Phosphorus-Containing Silsesquioxane Derivatives as Additive or Reactive Components of Epoxy Resins". Materials 13, nr 23 (26.11.2020): 5373. http://dx.doi.org/10.3390/ma13235373.

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Two phosphorus-containing cage-like silsesquioxane derivatives were synthesized as reactive or additive flame retardants for epoxy resin. The silsesquioxanes were obtained via an epoxide ring-opening reaction using a 10-hydroxy-9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPA). In one derivative containing in its structure 4 glycidoxypropyl and 4 phosphate groups, denoted as 4P4GS, only half of the epoxy rings was reacted with phosphate to obtain a reactive additive, while in the second derivative containing 8 phosphate groups, denoted as 8PS, all epoxy groups were converted, thus an additive modifier was obtained. The silsesquioxanes containing phosphorus atoms and the reactive phosphorus-free silsesquioxane derivative (octakis[(3-glycidoxypropyl)dimethylsiloxy]octasilsesquioxane (8GS)) were used to prepare hybrid materials based on epoxy resin. To compare the impact of the structure of silsesquioxane derivatives on the properties of hybrid materials, a number of samples containing 1, 5, and 10% of the modifiers making a series of epoxy materials containing additive or reactive modifiers, were obtained. The modified epoxies were studied using scanning electron microscopy and energy-dispersive X-ray spectroscopy (SEM-EDS), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), nanoindentation, water contact angle, and cone calorimetry tests to assess the effects of the modifier structure on the physicochemical properties of the investigated materials.
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Duszczak, Julia, Katarzyna Mituła, Monika Rzonsowska, Paweł Ławniczak, Rafał Januszewski, Bartłomiej Szarłan i Beata Dudziec. "Slick Synthetic Approach to Various Fluoroalkyl Silsesquioxanes—Assessment of their Dielectric Properties". Materials 15, nr 24 (16.12.2022): 8997. http://dx.doi.org/10.3390/ma15248997.

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We present a smart and efficient methodology for the synthesis of a variety of fluorinated silsesquioxanes (SQs) with diverse Si-O-Si core architecture. The protocol is based on an easy-to-handle and selective hydrosilylation reaction. An investigation on the placement of the reactive Si-HC=CH2 vs. Si-H in the silsesquioxane, as well as silane vs. olefin structure, respectively, on the progress and selectivity of the hydrosilylation process, was studied. Two alternative synthetic pathways for obtaining a variety of fluorine-functionalized silsesquioxanes were developed. As a result, a series of mono- and octa- T8 SQs, tri- ‘open-cage’ T7 SQs, in addition to di- and tetrafunctionalized double-decker silsesquioxane (DDSQ) derivatives, were obtained selectively with high yields. All products were characterized by spectroscopic (NMR, FTIR) techniques. Selected samples were subjected to the measurements revealing their dielectric permittivity in a wide range of temperatures (from −100 °C to 100 °C) and electric field frequencies (100–106 Hz).
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Dudziec, Beata, Patrycja Żak i Bogdan Marciniec. "Synthetic Routes to Silsesquioxane-Based Systems as Photoactive Materials and Their Precursors". Polymers 11, nr 3 (16.03.2019): 504. http://dx.doi.org/10.3390/polym11030504.

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Over the past two decades, organic optoelectronic materials have been considered very promising. The attractiveness of this group of compounds, regardless of their undisputable application potential, lies in the possibility of their use in the construction of organic–inorganic hybrid materials. This class of frameworks also considers nanostructural polyhedral oligomeric silsesquioxanes (POSSs) with “organic coronae” and precisely defined organic architectures between dispersed rigid silica cores. A significant number of papers on the design and development of POSS-based organic optoelectronic as well as photoluminescent (PL) materials have been published recently. In view of the scientific literature abounding with numerous examples of their application (i.e., as OLEDs), the aim of this review is to present efficient synthetic pathways leading to the formation of nanocomposite materials based on silsesquioxane systems that contain organic chromophores of complex nature. A summary of stoichiometric and predominantly catalytic methods for these silsesquioxane-based systems to be applied in the construction of photoactive materials or their precursors is given.
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D’Arienzo, Massimiliano, Sandra Dirè, Elkid Cobani, Sara Orsini, Barbara Di Credico, Carlo Antonini, Emanuela Callone i in. "SiO2/Ladder-Like Polysilsesquioxanes Nanocomposite Coatings: Playing with the Hybrid Interface for Tuning Thermal Properties and Wettability". Coatings 10, nr 10 (23.09.2020): 913. http://dx.doi.org/10.3390/coatings10100913.

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The present study explores the exploitation of ladder-like polysilsesquioxanes (PSQs) bearing reactive functional groups in conjunction with SiO2 nanoparticles (NPs) to produce UV-curable nanocomposite coatings with increased hydrophobicity and good thermal resistance. In detail, a medium degree regular ladder-like structured poly (methacryloxypropyl) silsesquioxane (LPMASQ) and silica NPs, either naked or functionalized with a methacrylsilane (SiO2@TMMS), were blended and then irradiated in the form of a film. Material characterization evidenced significant modifications of the structural organization of the LPMASQ backbone and, in particular, a rearrangement of the silsesquioxane chains at the interface upon introduction of the functionalized silica NPs. This leads to remarkable thermal resistance and enhanced hydrophobic features in the final nanocomposite. The results suggest that the adopted strategy, in comparison with mostly difficult and expensive surface modification and structuring protocols, may provide tailored functional properties without modifying the surface roughness or the functionalities of silsesquioxanes, but simply tuning their interactions at the hybrid interface with silica fillers.
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Gushikem, Yoshitaka, Edilson V. Benvenutti i Yuriy V. Kholin. "Synthesis and applications of functionalized silsesquioxane polymers attached to organic and inorganic matrices". Pure and Applied Chemistry 80, nr 7 (1.01.2008): 1593–611. http://dx.doi.org/10.1351/pac200880071593.

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Organofunctionalized silsesquioxane polymers obtained in a water-soluble form can be used to coat various substrates such as SiO2, SiO2/Al2O3, Al2O3, cellulose/Al2O3, and graphite or, when obtained in a water-insoluble form, can be used directly. These organofunctionalized silsesquioxanes can also be attached to poly(dimethylsiloxane) (PDMS) polymers. The functional groups constituted by neutral amine groups or cationic groups (pyridinium, 3- and 4-picolinium, or 1,4-diazabicyclo[2.2.2]octane (DABCO), mono- or -dicationic) have relatively high affinity for metal ion in ethanol solutions, as shown by their stability constants. Materials containing attached cationic functional groups have also been efficiently used to immobilize various electroactive species and to construct electrochemical sensors for analytical applications. This work discusses the preparation of silsesquioxane derivatives, their characterization as prepared and when dispersed on several substrates, and comments on some applications of these materials, with an emphasis on the metal adsorption process and manufacture of electrochemical sensors.
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Wangatia, Lodrick Makokha, Bin Sun, Ting Zeng i Meifang Zhu. "Reactive bay functionalized perylene monoimide-polyhedral oligomeric silsesquioxane organic electronic dye". Materials Science-Poland 33, nr 1 (1.03.2015): 113–21. http://dx.doi.org/10.1515/msp-2015-0016.

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AbstractAggregation-induced quenching is particularly detrimental in perylene diimides, which are characterized by a near-unity fluorescence quantum yield in solution but are far less emissive in the solid state. Previously, perylene diimide has been improved by linking it to the inorganic cage of polyhedral oligomeric silsesquioxanes. As a further study on perylene diimidepolyhedral oligomeric silsesquioxanes, we report on a double functionalized molecular structure, which can be used for substitution at the bay area and as a side group in other materials. Typical solution absorption and emission features of the perylene diimide fragment have been observed in this new reactive perylene diimide-polyhedral oligomeric silsesquioxane. Moreover, reduced stacking during aggregation and spherical particles exhibiting solid fluorescence have been obtained. Organic semiconducting material with enhanced solid state photophysical properties, like solid fluorescence is a subject of great interest owing to its possible high-tech applications in optoelectronic devices.
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Li, Qi Fang, Bo Dao Shi i Hai Ping Geng. "A New Completely Condensed Silsesquioxane: Diphenyl-Silsesquioxane". Advanced Materials Research 11-12 (luty 2006): 327–30. http://dx.doi.org/10.4028/www.scientific.net/amr.11-12.327.

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In this paper, diphenyl-silsesquioxane was synthesized and characterized. Firstly, octa-isobutyl silsesquioxane endo-disilanol (OIBS-EDN) containing two Si-OH functions was formed by base-catalyzed cleavage of octa-isobutyl silsesquioxane (OIBS). Then, oligomeric silsesquioxane containing two phenyl functions (DPS) was prepared by adding diphenyldichlorosilane to the solution of OIBS-EDN in right proportion with the presence of trithylamine in THF. The products were characterized by FTIR, 1HNMR, 13CNMR, 29SiNMR, X-ray diffraction, EA, DSC and GPC respectively. The results show that difunctional POSS with clear structure and high yield can be prepared by this process. And a new simple and feasible approach to design and synthesize difunctional POSS was put forward.
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Rozprawy doktorskie na temat "Silsesquioxane"

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König, Heinrich Josef. "Silsesquioxane mit oligomeren Käfigstrukturen". [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=967650496.

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Xu, Lan. "Synthesis of Perylenediimide-Functionalized Silsesquioxane Nanostructures". TopSCHOLAR®, 2014. http://digitalcommons.wku.edu/theses/1371.

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Organic semiconductors functionalized nanostructures are becoming as promising materials for electronic device applications including organic photovoltaics (OPVs). Perylenediimide (PDI) derivatives have also been known as one of the best n-type organic semiconductors. PDI derivatives can form bulk materials, which are both photochemically and thermally stable and have been widely used in various optoelectronic devices. Due to the formation of high electron mobility of crystalline domains, they prefer to incorporate into a silsesquioxane network. Here, we describe the potential applicability of perylenediimide functionalized silsesquioxane nanoribbons (PDI-dimethyl nanoribbons) as an acceptor for optoelectronic devices. We have developed synthetic procedures to make the PDI-dimethyl nanoribbons by the substitution reaction and the modified Stöber method. The PDI-dimethylethoxy silane precursor was produced in high yield by substituting 3-aminopropyldimethylethoxysilane on perylene-3,4,9,10-tetracarboxylicdianhydride as side chains. The optically active PDI-dimethyl nanoribbons were then formed upon hydrolysis with the certain concentration of ammonium hydroxide as a base. These nanoribbons were characterized using transmission electron microscopy (TEM), elemental analysis, and polarized optical microscopy. The photophysical properties in solution phase were also studied. The synthesis procedure developed here will have a great promise in large-scale manufacturing. Different shapes of PDI-dimethyl nanostructures, such as nanorods, nanochains, and nanoparticles, were discovered while varying the base concentrations. Also the morphologies of these PDI nanostructures were studied using TEM. Future studies will focus on optimizing procedures of PDI-dimethyl nanostructures and exploring new derivatives like perylenediimide dimer functionalized silsesquioxane polymers.
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Yang, Yuxing. "Synthesis and rearrangement of silsesquioxane cages". Thesis, Open University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393194.

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Soares, Isaac Vaz. "Síntese e caracterização de suportes a base de óxidos de silício modificados". Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/152609.

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Este trabalho descreve as sínteses e caracterizações de materiais à base de silício organofuncionalizados com 2-amino-5-(4-piridil)-1,3,4-tiadiazol (T8-Pr-APT e SG-Pr-APT) e 4 -amino-5-(4-piridil)-4H-1,2,4-triazol-3-tiol (T8-Pr-APTT e SG-Pr-APTT). Os materiais foram caracterizados por: espectroscopia na região do infravermelho (FTIR), ressonância magnética nuclear 29Si e 13C no estado sólido (RMN) e Microscopia eletrônica de varredura com Espectroscopia de energia dispersiva de raios-X (MEV-EDS). Nos estudos de batelada para os materiais, foram utilizados os íons metálicos de V(III), Fe(III), Cr(III), Cu(II), Pb(II) e os solventes foram água e etanol. Determinou-se a dose de adsorvente na solução e o tempo de equilíbrio, na qual, para o material T8-Pr-APT em todos os meios para os metais Cu, Pb e Cr, a capacidade máxima de adsorção ocorreu em 60 mg de adsorvente e para os metais restantes de 100 mg de adsorvente, o equilíbrio de adsorção em ambos os meios foi de aproximadamente 20 minutos para os metais Cu, Pb e Cr e 30 minutos para os demais, enquanto que, para o SGPr- APT em todos os meios para os metais Cu e Cr, a capacidade máxima de adsorção ocorreu em 60 mg de adsorvente e para os metais restantes de 100 mg de adsorvente, o equilíbrio de adsorção em ambos os meios foi de aproximadamente 40 minutos para todos os metais estudados. Estudou-se ainda a capacidade máxima de adsorção (Nf) para os solventes, na qual a capacidade máxima se deu em meio etanólico > aquoso. Em seguida, as isotermas de adsorção foram ajustadas pelos modelos Langmuir, Freundlich, Temkin e Dubinin-Radushkevich (D-R). Para cinética de adsorção dos metais, foram usados três modelos cinéticos como pseudoprimeira- ordem, pseudo-segunda-ordem e Elovich. Os modelos de Langmuir e Elovich foram os mais apropriados para descrever os dados de adsorção e cinética, respectivamente, de todos materiais. Os parâmetros termodinâmicos ΔGº, ΔHº e ΔSº foram avaliados para os materiais e observou-se que a adsorção de todos os metais, independentemente do adsorvente utilizado, foi um processo endotérmico e espontâneo, devido aos valores positivos de entalpia e negativo de energia livre de Gibbs, respectivamente. Os valores positivos da entropia indicam que o processo de adsorção é favorável e ocorre um aumento da desordem na interface sólido-solução. Estes resultados mostraram que os materiais possuem o mesmo comportamento termodinâmico. A atividade catalítica dos materiais suportados foram testados e comparados, utilizando complexo de molibdênio e tungstênio para epoxidação do 1-octeno, cicloocteno, cis-3-hexen- 1-ol, trans-3-hexen-1-ol e estireno, utilizando como oxidante o hidroperóxido de terc-butil (TBHP), onde ambos os materiais possuem semelhantes conversões e uma boa seletividade.
This work describes how syntheses and characterizations of silicon-based materials organofunctionalized with 2-amino-5- (4-pyridyl) -1,3,4-thiadiazole (T8-Pr-APT and SG-Pr- APT) and 4- Amino-5- (4-pyridyl) -4H-1,2,4-triazol-3-thiol (T8-Pr-APTT and SG-Pr-APTT). The materials were characterized by: infrared spectroscopy (FTIR), 29Si and 13C solid state nuclear magnetic resonance (NMR) and scanning electron microscopy with X-ray dispersive energy spectroscopy (SEM-EDS) V (III), Fe (III), Cr (III), Cu (II), Pb (II) and the solvents for ethanol and water. Determination of a adsorption dose in the solution and the equilibration time in quality for the T8-Pr-APT material in all media for the Cu, Pb and Cr metals, a maximum adsorption capacity occurred in 60 mg of adsorbent and for the remaining 100 mg adsorbent, the adsorption equilibrium in both media for approximately 20 minutes for the Cu, Pb and Cr metals and 30 minutes for the others, whereas for the SG-Pr-APT at all means for Cu and Cr metals, a maximum adsorption capacity occurred at 60 mg adsorbent and for other 100 mg adsorbent, the adsorption equilibrium in both media was about 40 minutes for all metals studied. A maximum adsorption capacity (Nf) was also studied for the solvents, in which a maximum capacity is given in ethanolic> aqueous medium. Then, as adsorption isotherms were adjusted by the Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (D-R) models. For kinetics of adsorption of metals, three kinetic models were used as pseudo-first-order, pseudo-second order and Elovich. The Langmuir and Elovich models were more adequate to describe the adsorption and kinetic data, respectively, of all materials. The thermodynamic parameters ΔGº, ΔHº and ΔSº were evaluated for the materials and it was observed that an adsorption of all metals, independently of the adsorbent used, for an endothermic and spontaneous process, for the enthalpy and negative positive values of Gibbs free energy , respectively. The positive entropy values indicate that the adsorption process is favorable and an increase in the disorder occurs at the solid-solution interface. These results show that the materials have the same thermodynamic behavior. The catalytic activity of the supported materials was tested and compared using a molybdenum and tungsten complex for the epoxidation of 1-octene, cyclooctene, cis-3-hexen-1-ol, trans-3-hexen-1-ol and styrene, Oxidant Or tert-butyl hydroperoxide (TBHP), where both materials have conversions and good selectivity
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Cai, Jun. "Photoluminescence studies of silsesquioxanes (SiO1.5)nRn and some selected organosilicon compounds". [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=965479447.

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Luvison, Caroline. "Preparação e caracterização de novos materiais híbridos a partir de (3-aminopropil) trimetoxisilano". reponame:Repositório Institucional da UCS, 2016. https://repositorio.ucs.br/handle/11338/1349.

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Nesse trabalho, foi investigada a obtenção de novos materiais a partir de reações de hidrólise e condensação ácida do (3-aminopropil)trimetoxisilano, que resultaram na formação de nanoestruturas híbridas com grupos amônios e contraíons cloreto (POSS-NH3Cl). As nanoestruturas posteriormente foram submetidas a trocas iônicas durante 0,5, 2, 12 e 48 h, para remoção dos íons cloreto. As análises titulométricas mostraram que a troca iônica ocorreu parcialmente. As partículas de POSS-NH2 formadas apresentam predominância de estruturas em forma de gaiola (T8) octafuncionalizadas. Após a troca iônica, as nanoestruturas possuem capacidade de se autoassociar por meio de interações eletrostáticas formando estruturas do tipo blackberry com aproximadamente 100 nm. Os aglomerados de POSS-NH2 são formados por partículas primárias com tamanho de 1,4 nm em forma de fractal de massa e tamanho de correlação () dependente da quantidade do tempo de troca iônica. Devido à característica eletrostática das partículas foi possível obter filmes híbridos opticamente transparentes com elevado grau de hidrofilicidade. As nanopartículas de POSS-NH2 foram utilizadas como aditivo de lubrificantes de fontes renováveis (ácidos graxos) por meio de reações de amidação direta assistida por micro-ondas, sem o uso de catalisadores. A formação das ligações amidas foi constatada por meio das técnicas FTIR e RMN de 1H, onde observaram-se bandas de deformação angular do NH em 1550 cm-1 e 1120 cm-1 e o aparecimento de um singleto alargado em 6,50 ppm (N-H). Em termos estruturais, para o biolubrificante foi constatado que uma molécula de ácido graxo liga com uma molécula de POSS-NH2, entretanto foi notada ainda a existência de aglomerados após a amidação, conforme resultados de MET dos lubrificantes. O uso de POSS-NH2 reduziu a taxa de oxidação dos biolubrificantes com dependência do tempo de troca iônica das partículas. Todos os biolubrificantes apresentaram comportamento reológico newtoniano, e a viscosidade a 25ºC mostrou-se dependente da quantidade de partículas e não do tempo de troca iônica. A adição de nanopartículas de POSS-NH2 melhorou o desempenho dos biolubrificantes aplicados em superfícies metálicas, visto que tribossistema estudado apresentou valores inferiores e mais estáveis de coeficiente de atrito em comparação com o óleo base. Além disso, os biolubrificantes apresentaram uma elevada capacidade do suporte de carga, que representa a carga crítica para a ocorrência de engripamento (scuffing) do sistema. A resistência ao desgaste das superfícies metálicas variou com a adição de partículas no óleo lubrificante e com os tempos de troca iônica adotados para a síntese das partículas.
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In this work, was investigated the obtaining of new materials from the hydrolysis and acid condensation reactions of (3-aminopropyl) trimethoxysilane, which resulted in the formation of hybrid nanostructures with ammoniums groups and counter ions chloride (POSS-NH3Cl). The nanostructures were subjected to ion exchange procedures for 0.5, 2, 12 and 48 h for the removal of chloride ions. The titrimetric and volumetric results showed that the ion exchange occurred partially. The synthesized particles are predominantly POSS-NH2 cage-shaped structures (T8). After the ion exchange, the nanostructures have ability to selfassembly through electrostatic interactions forming the blackberry-like structures with approximately 100 nm. The POSS-NH2 cluster are formed by primary particles with a size of 1.4nm structured in form of a mass fractal with correlation length () dependent on the ion exchange time. Due to the electrostatic characteristic of the particles was possible obtained hybrid films optically transparent with a high degree of hydrophilicity. POSS-NH2 nanoparticles were used as additive of lubricants of renewable sources (fatty acids) by means of microwave-assisted direct reactions of amidation, without the use of catalysts. The formation of amide bonds were confirmed through the FTIR and 1H NMR techniques, where angular deformation bands in NH in 1550 cm-1 and 1120 cm-1 and the appearance of an enlarged singlet in 6.50 ppm (NH) were observed. The biolubricants was found that an alloy fatty acid molecule with a POSS, but has not yet noticed the existence of agglomerates after amidation, as TEM results of biolubricants. The POSS-NH2 are bonded individually to only one fatty acid molecule, however it was noted the existence of cluster after amidation reactions, as observed in TEM results of the biolubricants. The addition of POSS-NH2 nanoparticles reduced the oxidation rate of the biolubricants and has dependence on the ion exchange time. All the biolubricants showed a Newtonian rheological behavior and the viscosity at 25°C dependent on the amount of particles and not the exchange time. The addition of POSS-NH2, improved the performance of the biolubricants applied on metallic surfaces, since the studied sliding pair showed lower and more stable values of coefficient of friction, as compared to the base oil. Moreover, the biolubricants showed a high load support capacity, which represents the critical load for the scuffing occurrence of the system. The wear resistance of the metallic surfaces changed with the addition of POSS particles in the lubricant oil and with the ionic exchange time adopted for the synthesis of the particles.
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Liu, Zhihua. "Synthesis and reactions of novel silsesquioxane cages". Thesis, Open University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397913.

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Gentle, Theresa Eileen. "Octopus and dendrimer molecules with silsesquioxane cores". Thesis, Open University, 1995. http://oro.open.ac.uk/57544/.

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The interest in materials with designed physical properties and controlled molecular formula is increasing. Octopus molecules, or materials with pendent groups from a core, and dendrimer molecules, or materials with a defined pattern of branching from a core are means of obtaining molecules of designed architecture. The work presented here involves the synthesis and characterization of octopus and dendrimer molecules of defined shape with molecular weights well into the thousands. These designed molecular materials have been synthesized by placing pendant groups symmetrically about a silsesquioxane [(SiO3/2)8] core. A facile, one-step route to hydrocarbon and siloxane functional octopus molecules via H2PtC16 catalyzed hydrosilylation of 1-alkenes and vinyl-functional siloxanes by T8 hydrogen silsesquioxane, (HSiO3/2)8, has been demonstrated. The chemistry of addition was studied, and it was found that while the addition of the I-alkenes to T8 was, regioprecise with only a-addition being observed, both a- and ß-addition occurred with vinyl siloxanes. In addition, H/vinyl exchange on silicon was observed to occur with addition of vinyl-siloxane to T8. The effect of the hydrosilylation catalyst, homogeneous and heterogeneous, on the regioselectivity of addition and on the extent of exchange on silicon has been evaluated via GPC and 13C and 29Si NMR. Investigations into the feasibility of placing a number of other moieties on the silsesquioxane core to show the almost limitless types of functional octopus molecules that can be made and to expand into dendritic molecules were also accomplished. For example polyether functional and mixed polyether/siloxane functional octopus molecules were synthesized and found to have interesting surface activity. The synthesis of an acrylate functional octopus molecule was accomplished and the product used to produce an ultra-violet curable coating. Finally, routes other than hydrosilylation to produce octopus and dendrimer molecules with silsesquioxane cores, for instance, the reaction of ROH with SiH of (SiO3/2)8, were developed and used to increase the types of functional octopus possible and to produce dendrimer molecules with silsesquioxane cores. The synthesis, characterization, and possible applications of silsesquioxane-based octopus and dendrimer molecules will be discussed.
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Schumacher, Manuela. "Smart organic-inorganic nanohybrids of functionalized silsesquioxane nanoparticles". kostenfrei, 2008. http://opus.ub.uni-bayreuth.de/volltexte/2009/549/.

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Neerudu, Sreeramulu Niharika. "Colloidal Self-Assembly of Multi-fluorescent Silsesquioxane Microparticles". TopSCHOLAR®, 2016. http://digitalcommons.wku.edu/theses/1607.

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Self-assembly of colloidal microparticles is one of the strategies for making characteristic patterns. These versatile self-assemblies provide a route to elevate the efficiency of an electronic device. Silsesquioxane particles with various functionalities were synthesized by a modified Stöber condensation method. This thesis describes the synthesis of benzylchloride silsesquioxanes, benzylchloride-amine silsesquioxanes and amine-functionalized silsesquioxane particles with multi-fluorescent tags. The size and morphology of the particles were controlled by varying the concentration of base and anhydrous ethanol (solvent). The size distribution of particles was controlled by adjusting the molar ratios of organotrialkoxy silane, base, and ethanol concentrations. Through selective post-functionalization with fused arenes of anthracene and rhodamine, multifluorescent particles were obtained. Morphologies and optical properties of particles were characterized by TEM, SEM, fluorescence optical microscopy, and absorption and fluorescence spectroscopies. The composition of silsesquioxanes was confirmed by FTIR, thermogravimetric analysis, and elemental analysis. A versatile technique was developed for the self-assembly of particles on different polymer substrates by changing the colloidal suspension concentration and the polymer substrate.
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Książki na temat "Silsesquioxane"

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Hartmann-Thompson, Claire, red. Applications of Polyhedral Oligomeric Silsesquioxanes. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-90-481-3787-9.

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Hartmann-Thompson, Claire. Applications of Polyhedral Oligomeric Silsesquioxanes. Dordrecht: Springer Science+Business Media B.V., 2011.

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Polyhedral Oligomeric Silsesquioxane (POSS) Polymer Nanocomposites. Elsevier, 2021. http://dx.doi.org/10.1016/c2019-0-02011-0.

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Thomas, Sabu, i Lakshmipriya Somasekharan. Polyhedral Oligomeric Silsesquioxane Polymer Nanocomposites: From Synthesis to Applications. Elsevier, 2021.

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Thomas, Sabu, i Lakshmipriya Somasekharan. Polyhedral Oligomeric Silsesquioxane Polymer Nanocomposites: From Synthesis to Applications. Elsevier, 2021.

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Hartmann-Thompson, Claire. Applications of Polyhedral Oligomeric Silsesquioxanes. Springer, 2013.

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Części książek na temat "Silsesquioxane"

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Bährle-Rapp, Marina. "Dimethiconol/Silsesquioxane Copolymer". W Springer Lexikon Kosmetik und Körperpflege, 161. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_3105.

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Pan, Guirong. "Polyhedral Oligomeric Silsesquioxane (POSS)". W Physical Properties of Polymers Handbook, 577–84. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-69002-5_34.

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Gun’ko, Yurii K., László Nagy, Wolfgang Brüser, Volker Lorenz, Axel Fischer, Stephan Gießmann, Frank T. Edelmann, Klaus Jacob i Attila Vértes. "Silsesquioxane Chemistry II. Tin(IV) and Hafnium(IV) Compounds of Silsesquioxanes". W Silicon Chemistry, 45–54. Vienna: Springer Vienna, 1999. http://dx.doi.org/10.1007/978-3-7091-6357-3_4.

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Pionteck, J., i M. Pyda. "pVT Data of Octaphenylethyl Silsesquioxane". W Part 2: Thermodynamic Properties – pVT-Data and Thermal Properties, 172–73. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41542-5_29.

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Matĕjka, Libor. "Epoxy-silica/silsesquioxane Polymer Nanocomposites". W Hybrid Nanocomposites for Nanotechnology, 1–84. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-0-387-30428-1_1.

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Wahab, Mohammad A., Il Kim i Chang-Sik Ha. "Silica- and Silsesquioxane-Containing Polymer Nanohybrids". W Macromolecules Containing Metal and Metal-Like Elements, 133–60. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2005. http://dx.doi.org/10.1002/0471712566.ch6.

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Mabry, Joseph M., Ashwani Vij, Brent D. Viers, Wade W. Grabow, Darrell Marchant, Scott T. Iacono, Patrick N. Ruth i Isha Vij. "Hydrophobic Silsesquioxane Nanoparticles and Nanocomposite Surfaces". W ACS Symposium Series, 290–300. Washington, DC: American Chemical Society, 2007. http://dx.doi.org/10.1021/bk-2007-0964.ch018.

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Iyer, Subramanian, Amjad Abu-Ali, Andrew Detwiler i David A. Schiraldi. "Transparent Polymer-Polyhedral Oligomeric Silsesquioxane Composites". W ACS Symposium Series, 313–25. Washington, DC: American Chemical Society, 2007. http://dx.doi.org/10.1021/bk-2007-0964.ch020.

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Dong, Fuping, i Chang-Sik Ha. "Silsesquioxane-Based Hierarchical and Hybrid Materials". W New Polymeric Materials Based on Element-Blocks, 95–120. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2889-3_6.

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Ghanbari, Hossein, Sayed Mahdi Marashi, Yasmin Rafiei, Karla Chaloupka i Alexander M. Seifalian. "Biomedical Application of Polyhedral Oligomeric Silsesquioxane Nanoparticles". W Advances in Silicon Science, 363–99. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-3787-9_9.

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Streszczenia konferencji na temat "Silsesquioxane"

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Tashiro, Yuji, Takeshi Sekito, Takafumi Iwata, Daishi Yokoyama i Toshiaki Nonaka. "Development of photosensitive silsesquioxane". W SPIE Lithography Asia - Taiwan, redaktorzy Alek C. Chen, Burn Lin i Anthony Yen. SPIE, 2008. http://dx.doi.org/10.1117/12.804669.

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LEE, ANDRE, DAVID VOGELSANG, JONATHAN DANNATT i ROBERT MALECZKA. "Hybrid Structured Phenylethynyl Silsesquioxane Resin Composites". W American Society for Composites 2018. Lancaster, PA: DEStech Publications, Inc., 2018. http://dx.doi.org/10.12783/asc33/26107.

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Konda, Ravinder, Priyanka Tavhare, Nilesh Ingale i Ajay Chaudhari. "Tetrahedral silsesquioxane-C2H2Ti complex for hydrogen storage". W DAE SOLID STATE PHYSICS SYMPOSIUM 2017. Author(s), 2018. http://dx.doi.org/10.1063/1.5029142.

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Olaru, Mihaela, Bogdana Simionescu, Cristian Ursu i Corneliu Cotofana. "Versatility of Silsesquioxane-Based Materials for Antimicrobial Coatings". W 1st International Electronic Conference on Materials. Basel, Switzerland: MDPI, 2014. http://dx.doi.org/10.3390/ecm-1-c001.

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Dinse, K. P. "EPR investigation of Hydrogen atoms in Silsesquioxane cages". W ELECTRONIC PROPERTIES OF MOLECULAR NANOSTRUCTURES: XV International Winterschool/Euroconference. AIP, 2001. http://dx.doi.org/10.1063/1.1426926.

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Lee, Andre. "Separation and Phase Behavior of Double-Decker Silsesquioxane Isomers". W The 3rd World Congress on Recent Advances in Nanotechnology. Avestia Publishing, 2018. http://dx.doi.org/10.11159/icnnfc18.1.

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Jeyakumar, Augustin, i Clifford L. Henderson. "Enhancing the electron beam sensitivity of hydrogen silsesquioxane (HSQ)". W Microlithography 2004, redaktor John L. Sturtevant. SPIE, 2004. http://dx.doi.org/10.1117/12.536245.

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Safarikova, B., A. Kalendova, V. Habrova, S. Zatloukalova i M. Machovsky. "Synergistic effect between polyhedral oligomeric silsesquioxane and flame retardants". W TIMES OF POLYMERS (TOP) AND COMPOSITES 2014: Proceedings of the 7th International Conference on Times of Polymers (TOP) and Composites. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4876789.

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Olewine, Michael, Ralph N. Wall i Gus J. Colovos. "Integration of hydrogen silsesquioxane into an advanced BiCMOS process". W Microelectronic Manufacturing, redaktorzy Mart Graef i Divyesh N. Patel. SPIE, 1998. http://dx.doi.org/10.1117/12.324032.

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Ito, Hiroshi, Hoa D. Truong, Sean D. Burns, Dirk Pfeiffer, Wu-Song Huang, Mahmoud M. Khojasteh, P. Rao Varanasi i Mike Lercel. "Silsesquioxane-based 193 nm bilayer resists: characterization and lithographic evaluation". W Microlithography 2005, redaktor John L. Sturtevant. SPIE, 2005. http://dx.doi.org/10.1117/12.598847.

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Raporty organizacyjne na temat "Silsesquioxane"

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Haddad, Timothy S., Brent D. Viers i Shawn H. Phillips. Polyhedral Oligomeric Silsesquioxane (POSS) Styrene Macromers. Fort Belvoir, VA: Defense Technical Information Center, listopad 2001. http://dx.doi.org/10.21236/ada410398.

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Haddad, Tim, i Shawn Phillips. Nanostructured Hybrid Organic/Inorganic Materials. Silsesquioxane Modified Plastics. Fort Belvoir, VA: Defense Technical Information Center, grudzień 1998. http://dx.doi.org/10.21236/ada409298.

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Phillips, Shawn H., Timothy S. Haddad i Sandra J. Tomczak. Developments in Nanoscience: Polyhedral Oligomeric Silsesquioxane (POSS) - Polymers. Fort Belvoir, VA: Defense Technical Information Center, marzec 2004. http://dx.doi.org/10.21236/ada422636.

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Haddad, Timothy S., Russell Stapleton, Hong G. Jeon, Patrick T. Mather i Joseph D. Lichtenhan. Nanostructured Hybrid Organic/Inorganic Materials, Silsesquioxane Modified Plastics. Fort Belvoir, VA: Defense Technical Information Center, styczeń 1996. http://dx.doi.org/10.21236/ada386916.

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Viers, Brent, Shawn Phillips, Timothy Haddad, Alan Esker i Joe Polidan. Model Polyhedral Oligomeric Silsesquioxane Thin Films for Coating Applications. Fort Belvoir, VA: Defense Technical Information Center, luty 2002. http://dx.doi.org/10.21236/ada410044.

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Viers, Brent D., Tim Haddad, Michael T. Bowers, Rusty Blanski i Rene Gonzalez. A Reanalysis of Polyhedral Oligomeric Silsesquioxane Ions and Salts. Fort Belvoir, VA: Defense Technical Information Center, marzec 2003. http://dx.doi.org/10.21236/ada416535.

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Stone, Rebecca L., Joseph M. Mabry i Timothy S. Haddad. Synthesis and Characterization of Long-Chain Fluorinated Polyhedral Oligomeric Silsesquioxane (F-POSS). Fort Belvoir, VA: Defense Technical Information Center, październik 2010. http://dx.doi.org/10.21236/ada533419.

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Mabry, Joseph M., Yvonne Diaz, Sean M. Ramirez i Timothy S. Haddad. Functional Perfluoroalkyl Polyhedral Oligomeric Silsesquioxane (F-POSS): Building Blocks for Low Surface Energy Materials. Fort Belvoir, VA: Defense Technical Information Center, październik 2010. http://dx.doi.org/10.21236/ada533422.

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Chaffee, Kevin P., i Patrick T. Mather. A Preliminary Investigation of the Interfacial and Dielectric Properties of Polyhedral Oligomeric Silsesquioxane Polymer Blends. Fort Belvoir, VA: Defense Technical Information Center, listopad 1998. http://dx.doi.org/10.21236/ada362369.

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Viers, Brent D., Alan Esker i Katie Farmer. Polyhedral Oligomeric Silsesquioxanes Surfactants. Fort Belvoir, VA: Defense Technical Information Center, styczeń 2001. http://dx.doi.org/10.21236/ada410399.

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