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Artículos de revistas sobre el tema "Silsesquioxane"

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Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 10 de marzo de 2023

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1

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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2

Lichtenhan, Joseph D., Ngo Q. Vu, Jason A. Carter, Jeffrey W. Gilman y Frank J. Feher. "Silsesquioxane-siloxane copolymers from polyhedral silsesquioxanes". Macromolecules 26, n.º 8 (abril de 1993): 2141–42. http://dx.doi.org/10.1021/ma00060a053.

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3

Brząkalski, Dariusz, Robert E. Przekop, Bogna Sztorch, Paulina Jakubowska, Marek Jałbrzykowski y Bogdan Marciniec. "Silsesquioxane Derivatives as Functional Additives for Preparation of Polyethylene-Based Composites: A Case of Trisilanol Melt-Condensation". Polymers 12, n.º 10 (2 de octubre de 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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4

Szołyga, Mariusz, Michał Dutkiewicz, Marek Nowicki, Kamila Sałasińska, Maciej Celiński y Bogdan Marciniec. "Phosphorus-Containing Silsesquioxane Derivatives as Additive or Reactive Components of Epoxy Resins". Materials 13, n.º 23 (26 de noviembre de 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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5

Duszczak, Julia, Katarzyna Mituła, Monika Rzonsowska, Paweł Ławniczak, Rafał Januszewski, Bartłomiej Szarłan y Beata Dudziec. "Slick Synthetic Approach to Various Fluoroalkyl Silsesquioxanes—Assessment of their Dielectric Properties". Materials 15, n.º 24 (16 de diciembre de 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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6

Dudziec, Beata, Patrycja Żak y Bogdan Marciniec. "Synthetic Routes to Silsesquioxane-Based Systems as Photoactive Materials and Their Precursors". Polymers 11, n.º 3 (16 de marzo de 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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7

D’Arienzo, Massimiliano, Sandra Dirè, Elkid Cobani, Sara Orsini, Barbara Di Credico, Carlo Antonini, Emanuela Callone et al. "SiO2/Ladder-Like Polysilsesquioxanes Nanocomposite Coatings: Playing with the Hybrid Interface for Tuning Thermal Properties and Wettability". Coatings 10, n.º 10 (23 de septiembre de 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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8

Gushikem, Yoshitaka, Edilson V. Benvenutti y Yuriy V. Kholin. "Synthesis and applications of functionalized silsesquioxane polymers attached to organic and inorganic matrices". Pure and Applied Chemistry 80, n.º 7 (1 de enero de 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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9

Wangatia, Lodrick Makokha, Bin Sun, Ting Zeng y Meifang Zhu. "Reactive bay functionalized perylene monoimide-polyhedral oligomeric silsesquioxane organic electronic dye". Materials Science-Poland 33, n.º 1 (1 de marzo de 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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10

Li, Qi Fang, Bo Dao Shi y Hai Ping Geng. "A New Completely Condensed Silsesquioxane: Diphenyl-Silsesquioxane". Advanced Materials Research 11-12 (febrero de 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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11

Hu, Jian Kun, Qun Chao Zhang y Shu Ling Gong. "Bridged polyhedral oligomeric silsesquioxane (POSS): A potential member of silsesquioxanes". Chinese Chemical Letters 23, n.º 2 (febrero de 2012): 181–84. http://dx.doi.org/10.1016/j.cclet.2011.11.006.

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12

Oaten, Matthew y Namita Roy Choudhury. "Synthesis and Characterization of a POSS-Urethane Hybrid Coating for Use in the Corrosion Protection of Metal". Journal of Metastable and Nanocrystalline Materials 23 (enero de 2005): 231–34. http://dx.doi.org/10.4028/www.scientific.net/jmnm.23.231.

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The potential of cyclic silsesquioxanes as flexible coatings has been explored in this work for corrosion protection of metal. A polyurethane coating containing an inorganic polyhedral oligomeric silsesquioxane (POSS) was synthesized and characterized by means of photo-acoustic infrared spectroscopy, X-ray photoelectron spectroscopy (XPS), contact angle and modulated differential scanning calorimetry (MDSC). The coating has been applied to clean steel substrates via dip and spin coating. The POSS based hybrid coating is found to be uniform, dense and essentially defect free. XPS shows that the coating forms a lamellar layered structure on the substrate.
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13

Białek, Marzena y Krystyna Czaja. "Application of Silsesquioxanes in the Preparation of Polyolefin-Based Materials". Materials 16, n.º 5 (24 de febrero de 2023): 1876. http://dx.doi.org/10.3390/ma16051876.

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This paper is a review of studies on the use of the polyhedral oligomeric silsesquioxanes (POSS) of various structures in the synthesis of polyolefins and the modification of their properties, namely: (1) components of organometallic catalytic systems for the polymerization of olefins, (2) comonomers in the copolymerization with ethylene, and (3) fillers in composites based on polyolefins. In addition, studies on the use of new silicon compounds, i.e., siloxane–silsesquioxane resins, as fillers for composites based on polyolefins are presented. The authors dedicate this paper to Professor Bogdan Marciniec on the occasion of his jubilee.
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14

Lorenz, Volker, Marlies Spoida, Axel Fischer y Frank T. Edelmann. "Silsesquioxane chemistry". Journal of Organometallic Chemistry 625, n.º 1 (abril de 2001): 1–6. http://dx.doi.org/10.1016/s0022-328x(00)00853-6.

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15

Lorenz, Volker, Axel Fischer y Frank T. Edelmann. "Silsesquioxane chemistry." Journal of Organometallic Chemistry 647, n.º 1-2 (marzo de 2002): 245–49. http://dx.doi.org/10.1016/s0022-328x(01)01434-6.

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16

Gun’ko, Yurii K., László Nagy, Wolfgang Brüser, Volker Lorenz, Axel Fischer, Stephan Gießmann, Frank T. Edelmann, Klaus Jacob y Attila Vértes. "Silsesquioxane Chemistry II. Tin(IV) and Hafnium(IV) Compounds of Silsesquioxanes". Monatshefte für Chemie / Chemical Monthly 130, n.º 1 (enero de 1999): 45–54. http://dx.doi.org/10.1007/pl00010174.

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17

Gardella, Lorenza, Alberto Fina y Orietta Monticelli. "Preparation and Characterization of Novel Electrospinnable PBT/POSS Hybrid Systems Starting from c-PBT". Journal of Nanomaterials 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/101674.

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Novel hybrid systems based on poly(butyleneterephthalate) (PBT) and polyhedral oligomeric silsesquioxanes (POSS) have been prepared by applying the ring-opening polymerization of cyclic poly(butyleneterephthalate) oligomers. Two types of POSS have been used: one characterized by hydroxyl functionalities (named POSS-OH) and another without specific reactive groups (named oib-POSS). It was demonstrated that POSS-OH acts as an initiator for the polymerization reaction, leading to the direct insertion of the silsesquioxane into the polymer backbone. Among the possible applications of the PBT/POSS hybrid system, the possibility to obtain nanofibers has been assessed in this work.
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18

Rozga-Wijas, Krystyna, Irena Bak-Sypien, Katarzyna Turecka, Magdalena Narajczyk y Krzysztof Waleron. "Cationic Phenosafranin Photosensitizers Based on Polyhedral Oligomeric Silsesquioxanes for Inactivation of Gram-Positive and Gram-Negative Bacteria". International Journal of Molecular Sciences 22, n.º 24 (13 de diciembre de 2021): 13373. http://dx.doi.org/10.3390/ijms222413373.

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The high photodynamic effect of the Newman strain of the S. aureus and of clinical strains of S. aureus MRSA 12673 and E. coli 12519 are observed for new cationic light-activated phenosafranin polyhedral oligomeric silsesquioxane (POSS) conjugates in vitro. Killing of bacteria was achieved at low concentrations of silsesquioxanes (0.38 µM) after light irradiation (λem. max = 522 nm, 10.6 mW/cm2) for 5 min. Water-soluble POSS-photosensitizers are synthesized by chemically coupling a phenosafranin dye (PSF) (3,7-diamino-5-phenylphenazine chloride) to an inorganic silsesquioxane cage activated by attachment of succinic anhydride rings. The chemical structure of conjugates is confirmed by 1H, 13C NMR, HRMS, IR, fluorescence spectroscopy and UV-VIS analyzes. The APDI and daunorubicin (DAU) synergy is investigated for POSSPSFDAU conjugates. Confocal microscopy experiments indicate a site of intracellular accumulation of the POSSPSF, whereas iBuPOSSPSF and POSSPSFDAU accumulate in the cell wall or cell membrane. Results from the TEM study show ruptured S. aureus cells with leaking cytosolic mass and distorted cells of E. coli. Bacterial cells are eradicated by ROS produced upon irradiation of the covalent conjugates that can kill the bacteria by destruction of cellular membranes, intracellular proteins and DNA through the oxidative damage of bacteria.
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19

Fernández, Guzmán, Ramos y Fernández. "Effect of Alkyl Chain Length in POSS Nanocage on Non-Isothermal Crystallization Behavior of PCL/Amino-POSS Nanocomposites". Polymers 11, n.º 10 (19 de octubre de 2019): 1719. http://dx.doi.org/10.3390/polym11101719.

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The study of the non-isothermal crystallization behavior of polymers is of great importance due to the effect of degree of crystallinity and crystallization process on the polymer properties. The effect of aminopropylisobutyl polyhedral oligomeric silsesquioxane (APIBPOSS) and aminopropylisooctyl polyhedral oligomeric silsesquioxane (APIOPOSS) on poly(ε-caprolactone) (PCL) crystallization is studied by differential scanning calorimetry (DSC) under non-isothermal conditions and polarized optical microscopy (POM). The crystallization kinetics is analyzed using the Avrami and Mo models, and effective activation energies are evaluated by the Friedman isoconversional method. The results show that the compatibility between polyhedral oligomeric silsesquioxanes (POSS) and PCL and POSS loading affect the crystallization process. A higher crystallization temperature, a narrower size distribution of crystallite, and a faster crystallization rate are obtained in the presence of all the studied contents of APIBPOSS and at lower contents of APIOPOSS. At APIOPOSS contents higher than 2 wt %, the crystallization temperature is lowered, the size distribution of crystallite is broadened, and the crystallization process is retarded. The presence of POSS leads to an increase in the number of nucleation sites, and a reduction in the size of the crystallite and the overall degree of crystallinity, as a result of the confinement of PCL chains caused by POSS nanoparticles.
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20

Lichtenhan, Joseph D. "Polyhedral Oligomeric Silsesquioxanes: Building Blocks for Silsesquioxane-Based Polymers and Hybrid Materials". Comments on Inorganic Chemistry 17, n.º 2 (marzo de 1995): 115–30. http://dx.doi.org/10.1080/02603599508035785.

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21

Tang, Ping, Kai Xiang, Huijie Wei, Shuhong Li y Caihong Xu. "A high-emissive and stable luminescent silafluorene hybrid constructed by hydrosilylation". Journal of Chemical Research 43, n.º 3-4 (marzo de 2019): 144–48. http://dx.doi.org/10.1177/1747519819857504.

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Under Karstedt’s catalyst, an organic–inorganic hybrid fluorescent nano-molecular dendrimer has been synthesized by grafting silafluorene units onto the polyhedral oligomeric silsesquioxane core through hydrosilylation reaction. The new hybrid molecule exhibits high solid fluorescence quantum efficiency because of the nano-size and large steric hindrance of the polyhedral oligomeric silsesquioxane core. Thermogravimetric analysis shows that the thermal stability of the target compound is effectively improved by the presence of polyhedral oligomeric silsesquioxane.
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22

Knischka, Ralf, Frank Dietsche, Ralf Hanselmann, Holger Frey, Rolf Mülhaupt y Pierre J. Lutz. "Silsesquioxane-Based Amphiphiles". Langmuir 15, n.º 14 (julio de 1999): 4752–56. http://dx.doi.org/10.1021/la981594a.

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23

Edelmann, Frank T., Stephan Gießmann y Axel Fischer. "Silsesquioxane Chemistry, 4." Journal of Organometallic Chemistry 620, n.º 1-2 (febrero de 2001): 80–89. http://dx.doi.org/10.1016/s0022-328x(00)00867-6.

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24

Lorenz, Volker, Axel Fischer y Frank T. Edelmann. "Silsesquioxane chemistry, 6". Inorganic Chemistry Communications 3, n.º 6 (junio de 2000): 292–95. http://dx.doi.org/10.1016/s1387-7003(00)00071-x.

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25

Asuncion, Michael Z. y Richard M. Laine. "Silsesquioxane Barrier Materials". Macromolecules 40, n.º 3 (febrero de 2007): 555–62. http://dx.doi.org/10.1021/ma062305p.

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26

Sugita, Hikaru, Kei Tanaka, Kaori Shirato, Ryota Yamamoto y Kazuko Tateshima. "Styryl silsesquioxane photoresist". Journal of Applied Polymer Science 132, n.º 7 (24 de septiembre de 2014): n/a. http://dx.doi.org/10.1002/app.41459.

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27

Kostenko, Nataliya, Jochen Gottfriedsen, Liane Hilfert y Frank T. Edelmann. "A Synthetic Route to Quaternary Pyridinium Salt-Functionalized Silsesquioxanes". International Journal of Polymer Science 2012 (2012): 1–9. http://dx.doi.org/10.1155/2012/586594.

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A synthetic route to potentially biocidal silsesquioxanes functionalized by quaternary pyridinium functionalities has been developed.N-Alkylation reactions of the precursor compounds 4-(2-(trimethoxysilyl)ethyl)-pyridine (5) and 4-(2-trichloro-silylethyl)pyridine (6) with iodomethane,n-hexylbromide, andn-hexadecylbromide cleanly afforded the correspondingN-alkylpyridinium salts (7–10). The synthesis of a 4-(2-ethyl)pyridine POSS derivative (2) was achieved by capping of the silsesquioxane trisilanol Cy7Si7O9(OH)3(1) via two different preparative routes. Attempts to use compound2as precursor for quaternary pyridinium salt-functionalized POSS derivatives were met with only partial success. Only the reaction with iodomethane cleanly afforded the newN-methylpyridinium salt12in high yield, whereasn-hexylbromide andn-hexadecylbromide failed to react with2even under forcing conditions.
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28

Imoto, Hiroaki, Ryoichi Katoh y Kensuke Naka. "Open-cage silsesquioxane necklace polymers having closed-cage silsesquioxane pendants". Polymer Chemistry 9, n.º 30 (2018): 4108–12. http://dx.doi.org/10.1039/c8py00758f.

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A novel POSS monomer design has been proposed; a closed-cage POSS was tethered to an open-cage POSS, and the remaining two functional groups were employed for polymerization. The thermal and optical properties of the obtained main-chain type POSS polymers can be widely tuned by the substituents at the corners of the POSSs.
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29

Arenas, L. T., N. M. Simon, Y. Gushikem, T. M. H. Costa, E. C. Lima y E. V. Benvenutti. "A water soluble 3-n-propyl-1-azonia-4-azabicyclo[2.2.2]octanechloride silsesquioxane grafted onto Al/SiO2 surface: chromium adsorption study". Eclética Química 31, n.º 2 (2006): 53–58. http://dx.doi.org/10.1590/s0100-46702006000200008.

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The water soluble material, 3-n-propyl-1-azonia-4-azabicyclo[2.2.2]octanechloride silsesquioxane (dabcosil silsesquioxane) was obtained. The dabcosil silsesquioxane was grafted onto a silica surface, previously modified with aluminum oxide. The resulting solid, dabcosil-Al/SiO2, presents 0.15 mmol of dabco groups per gram of material. The product of the grafting reaction was analyzed by infrared spectroscopy and N2 adsorption-desorption isotherms. The dabcosil-Al/SiO2 material was used as sorbent for chromium (VI) adsorption in aqueous solution.
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30

Ramli, Mohamad Riduwan, Rafiza Ramli, Khairudin Mohamed y Zulkifli Ahmad. "Synthesis and fidelity study of ultraviolet-curable hydrogen silsesquioxane analogue as an elastomeric stamp". RSC Advances 6, n.º 84 (2016): 81364–71. http://dx.doi.org/10.1039/c6ra15947h.

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UV curable silsesquioxane and PDMS as the spacer was synthesised and its fidelity was studied. Synergistic effect of hard segment of silsesquioxane and soft segment of PDMS contributes to the flexibility and surface roughness of HSQ analogue.
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31

Gumenna, Mariana, Nina Klimenko, Alexandr Stryutsky, Alexandr Shevchuk, Viktor Kravchenko, Alexandr Kravchenko y Valery Shevchenko. "OLIGOMERIC SILSESQUIOXANES COMBINING AZO- AND FLUORESCENT DYES IN ORGANIC SHELL". Ukrainian Chemistry Journal 85, n.º 4 (7 de junio de 2019): 71–80. http://dx.doi.org/10.33609/0041-6045.85.4.2019.71-80.

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A method for the synthesis of reactive oligomeric silsesquioxanes, combining fragments of azo dye 4-(phenylazo)phenol and fluorescent dye Rhodamine B in various proportions in an organic shell was developed. These compounds were obtained by the reaction between the oligosilsesquioxane nanoparticles consisting of a mixture of linear, branched, ladder and polyhedral structures with epoxy groups in an organic frame (OSS–Ep) and the dyes. The structure of the synthesized substances was characterized by the methods of IR and 1H NMR spectroscopy. The UV-Vis spectra of OSS–Pp–Rh in DMF solution contain absorption bands characteristic of both acidic (560 and 350 nm) and lactone (in the range of 318–326 nm) forms of Rhodamine B. The absorption band of 4-(phenylazo) phenol fragments corresponding to π−π* transition is observed at 348 nm and overlaps the absorption band of Rhodamine B at 350 nm.The intensity of the absorption bands of fragments of various dyes depends on their content in organic frame of the silsesquioxane core. The intensity of the absorption bands at 348 nm and at 560 nm increases with an increase in the content of 4-(phenylazo)phenol and Rhodamine B correspondingly.It should be noted that when using DMF as a solvent the absorption band corresponding to acidic form of Rhodamine B at 560 nm in the UV-Vis spectra of the compounds obtained is more intense than similar band in the spectrum of the original Rhodamine B. Therefore, the attachment of Rhodamine B to the silsesquioxane core of oligomeric silsesquioxanes mixture does not have a significant effect on the position of absorption maxima in the UV-spectrum and prevents dye’s fragments from converting to the colorless lactone form. In the fluorescence spectra of OSS–Pp–Rh obtained using DMF as a solvent a peak at λ max = 592 nm (λex= 520 nm) is observed. The position of the fluorescence peak and its intensity in the spectra at the same optical density of the medium practically do not depend on the ratio of fragments of 4-(phenylazo)phenol and Rhodamine B in organic frame of OSS–Pp–Rh. The combination of two different chromophores in organic shell of the silsesquioxane core broadens the range of absorbed light and the change of their ratio allows to adjust the absorption intensity in a certain area. The presence of hydroxyl groups makes it possible to introduce the obtained compounds into the composition of polymeric organic-inorganic nanocomposites by covalent bonding.
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32

Mituła, Katarzyna, Michał Dutkiewicz, Julia Duszczak, Monika Rzonsowska y Beata Dudziec. "Preparation of Tri(alkenyl)functional Open-Cage Silsesquioxanes as Specific Polymer Modifiers". Polymers 12, n.º 5 (6 de mayo de 2020): 1063. http://dx.doi.org/10.3390/polym12051063.

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The scientific reports on polyhedral oligomeric silsesquioxanes are mostly focused on the formation of completely condensed T8 cubic type structures and recently so-called double-decker derivatives. Herein, we report on efficient synthetic routes leading to trifunctionalized, open-cage silsesquioxanes with alkenyl groups of varying chain lengths from -vinyl to -dec-9-enyl and two types of inert groups (iBu, Ph) at the silsesquioxane core. The presented methodology was focused on hydrolytic condensation reaction and it enabled obtaining titled compounds with high yields and purity. A parallel synthetic methodology that was based on the hydrosilylation reaction was also studied. Additionally, a thorough characterization of the obtained compounds was performed, also in terms of their thermal stability, melting and crystallization temperatures (TGA and DSC) in order to show the changes in the abovementioned parameters dependent on the type of reactive as well as inert groups at Si-O-Si core. The presence of unsaturated alkenyl groups has a profound impact on the application potential of these systems, i.e., as modifiers or comonomers for copolymerization reaction.
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33

Choi, Jiwon, Albert F. Yee y Richard M. Laine. "Organic/Inorganic Hybrid Composites from Cubic Silsesquioxanes. Epoxy Resins of Octa(dimethylsiloxyethylcyclohexylepoxide) Silsesquioxane". Macromolecules 36, n.º 15 (julio de 2003): 5666–82. http://dx.doi.org/10.1021/ma030172r.

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34

Nowacka, Maria, Tomasz Makowski y Anna Kowalewska. "Hybrid Fluorescent Poly(silsesquioxanes) with Amide- and Triazole-Containing Side Groups for Light Harvesting and Cation Sensing". Materials 13, n.º 20 (10 de octubre de 2020): 4491. http://dx.doi.org/10.3390/ma13204491.

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Hybrid polymers containing pyrene (Py) units bound to linear poly(silsesquioxane) (LPSQ) chains through flexible linkers containing heteroatoms (S, N, O) (LPSQ-triazole-Py and LPSQ-amide-Py) exhibit intense fluorescence emission, both in very diluted solutions (c = 10−8 mol/L) and in the solid state. The materials are thermally stable and exhibit good thin film forming abilities. Their optical and physicochemical properties were found to be strongly dependent on the structure of the side chains. Comparative studies with octahedral silsesquioxane (POSS) analogues (POSS-triazole-Py and POSS-amide-Py) emphasized the role of the specific double-strand architecture of the LPSQ backbone and distribution of side Py groups for their photo-luminescent properties. The new hybrid materials were tested as fluorescence energy donors to red-emitting dyes (Nile Red and Coumarine 6). All the silsesquioxanes studied were found to be able to transfer FL emission energy to Coumarin 6, irrespectively of their spatial structure. However, due to the differences in the wavelength range of FL emission, only LPSQ-triazole-Py were able to act as energy donors to Nile Red. The Py-grafted LPSQ may be also applied for development of soluble and highly emissive chemosensors. Their fluorescent nature was explored for the detection of Cu(II), Fe(III), Co(II), Ag(I), Hg(II), Mg(II), Ca(II), Pb(II) and Zn(II). The morphology of the side chains and hydrogen-bonding interactions influenced the sensing capacity of all the studied materials.
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35

Niemczyk, Arkadiusz, Katarzyna Dziubek, Beata Sacher-Majewska, Krystyna Czaja, Justyna Czech-Polak, Rafał Oliwa, Joanna Lenża y Mariusz Szołyga. "Thermal Stability and Flame Retardancy of Polypropylene Composites Containing Siloxane-Silsesquioxane Resins". Polymers 10, n.º 9 (13 de septiembre de 2018): 1019. http://dx.doi.org/10.3390/polym10091019.

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A novel group of silsesquioxane derivatives, which are siloxane-silsesquioxane resins (S4SQ), was for the first time examined as possible flame retardants in polypropylene (PP) materials. Thermal stability of the PP/S4SQ composites compared to the S4SQ resins and neat PP was estimated using thermogravimetric (TG) analysis under nitrogen and in air atmosphere. The effects of the non-functionalized and n-alkyl-functionalized siloxane-silsesquioxane resins on thermostability and flame retardancy of PP materials were also evaluated by thermogravimetry-Fourier transform infrared spectrometry (TG-FTIR) and by cone calorimeter tests. The results revealed that the functionalized S4SQ resins may form a continuous ceramic layer on the material surface during its combustion, which improves both thermal stability and flame retardancy of the PP materials. This beneficial effect was observed especially when small amounts of the S4SQ fillers were applied. The performed analyses allowed us to propose a possible mechanism for the degradation of the siloxane-silsesquioxane resins, as well as to explain their possible role during the combustion of the PP/S4SQ composites.
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36

Jug, Karl y Igor P. Gloriozov. "Mechanism of silsesquioxane growth". Physical Chemistry Chemical Physics 4, n.º 6 (6 de febrero de 2002): 1062–66. http://dx.doi.org/10.1039/b107803h.

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37

Annand, Judith, Helen C. Aspinall y Alexander Steiner. "Novel Heterometallic Lanthanide Silsesquioxane". Inorganic Chemistry 38, n.º 17 (agosto de 1999): 3941–43. http://dx.doi.org/10.1021/ic990208p.

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38

Ohde, Christian, Christian Limberg, Reinhard Stösser y Serhiy Demeshko. "Oxovanadium(IV) Silsesquioxane Complexes". Inorganic Chemistry 49, n.º 5 (marzo de 2010): 2479–85. http://dx.doi.org/10.1021/ic902392y.

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39

Fertier, Laurent, Christophe Théron, Carole Carcel, Philippe Trens y Michel Wong Chi Man. "pH-Responsive Bridged Silsesquioxane". Chemistry of Materials 23, n.º 8 (26 de abril de 2011): 2100–2106. http://dx.doi.org/10.1021/cm103327y.

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40

Punniyakoti, Sathyanarayanan, Ragavendran Sivakumarasamy, Francois Vaurette, Pierre Joseph, Katsuhiko Nishiguchi, Akira Fujiwara y Nicolas Clément. "Hydrogen Silsesquioxane-Based Nanofluidics". Advanced Materials Interfaces 4, n.º 7 (27 de enero de 2017): 1601155. http://dx.doi.org/10.1002/admi.201601155.

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41

Hurwitz, F. I., S. C. Farmer, F. M. Terepka y T. A. Leonhardt. "Silsesquioxane-derived ceramic fibres". Journal of Materials Science 26, n.º 5 (1 de enero de 1991): 1247–52. http://dx.doi.org/10.1007/bf00544462.

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42

Fei, Zhaofu, Reinhard Schmutzler y Frank T. Edelmann. "Silsesquioxane Chemistry. 12 [1] Preparation and Complexation of a Novel Silsesquioxanyl Phosphine Ligand". Zeitschrift für anorganische und allgemeine Chemie 629, n.º 2 (febrero de 2003): 353–56. http://dx.doi.org/10.1002/zaac.200390056.

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43

Iyoku, Yoshitake, Masa-aki Kakimoto y Yoshio Imai. "The preparation of new poly(phenylsilsesquioxane)-polyimide hybrid films by the sol-gel process and their properties". High Performance Polymers 6, n.º 1 (febrero de 1994): 53–62. http://dx.doi.org/10.1088/0954-0083/6/1/006.

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The preparation of poly(phenylsilsesquioxane)-polyimide hybrid films was successfully performed with phenyltriethoxysilane (PhTES) and the polyamic acid (polyimide precursor) prepared from 4.4'-oxydianiline (ODA) and pyromellitic dianhydride (PMDA). During the heating process at 300 C, the imidization of the polyamic acid and the sol-gel reaction, hydrolysis and condensation of PhTES, proceeded simultaneously. The IR spectrum and the t3C-NMR and 29Si-NmR spectra showed that the sol-gel reaction of PhTES proceeded in the polymer matrix with high conversion. The hybrid films with a silsesquioxane content up to 75 wt% were obtained as the self-standing form. The hybrid films having a silsesquioxane content of 45 wt% were yellow and transparent, and those having more silicone content were yellow and translucent. The therma] properties of the hybrid films were improved to some extent by the introduction of the silsesquioxane component into the polyimide matrix. With respect to the tensile properties. the tensile strength remained around 85 MPa up to a silicone content of 45 wt%. This value was twice that of the hybrid films based on methyltriethoxysilane. The tensile modulus decreased with increasing silsesquioxane content.
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44

Chanmungkalakul, Supphachok, Vuthichai Ervithayasuporn, Sasikarn Hanprasit, Manlika Masik, Nicha Prigyai y Suda Kiatkamjornwong. "Silsesquioxane cages as fluoride sensors". Chemical Communications 53, n.º 89 (2017): 12108–11. http://dx.doi.org/10.1039/c7cc06647c.

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45

Fang, Yanhong y Ping Wang. "Modification of Polyhedral Oligomeric Silsesquioxane (Epoxy Resin-Polyhedral Oligomeric Silsesquioxane) by Inorganic Nanoparticles". Journal of Nanoelectronics and Optoelectronics 16, n.º 6 (1 de junio de 2021): 874–78. http://dx.doi.org/10.1166/jno.2021.3031.

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As a kind of green and clean energy, solar energy has attracted more and more attention. Among them, the antifouling treatment on the surface of photovoltaic panels is the key to improve the photoelectric conversion efficiency. EP-POSS (epoxy resin-polyhedral oligomeric silsesquioxane) has good hydrophobicity and has potential application value in the field of protective coating of photovoltaic panels. UV-vis tests show EP-POSS light transmittance about 85%, have good pervious to light quality, through the ZnO and SiO2 inorganic nanoparticles to modification of EP-POSS, in order to improve the wearability of EP-POSS coating and bacteriostasis, the EP-POSS microstructure was tested by TEM, XRD characterization of nano particles and the compatibility of EP-POSS, again with TGA, adhesion and wear resistance test the performance of the EP-POSS found inorganic nanoparticles can better improve the use performance of EP-POSS.
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46

Su, Hung-Wen y Wen-Chang Chen. "Preparation of nanoporous poly(methyl silsesquioxane) films using core-shell silsesquioxane as porogen". Materials Chemistry and Physics 114, n.º 2-3 (abril de 2009): 736–41. http://dx.doi.org/10.1016/j.matchemphys.2008.10.035.

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47

Chen, Wen‐Chang, Shu‐Chun Lin, Bau‐Tong Dai y Ming‐Shih Tsai. "Chemical Mechanical Polishing of Low‐Dielectric‐Constant Polymers: Hydrogen Silsesquioxane and Methyl Silsesquioxane". Journal of The Electrochemical Society 146, n.º 8 (1 de agosto de 1999): 3004–8. http://dx.doi.org/10.1149/1.1392043.

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48

Chanmungkalakul, Supphachok, Vuthichai Ervithayasuporn, Patcharaporn Boonkitti, Alisa Phuekphong, Nicha Prigyai, Sumana Kladsomboon y Suda Kiatkamjornwong. "Anion identification using silsesquioxane cages". Chemical Science 9, n.º 40 (2018): 7753–65. http://dx.doi.org/10.1039/c8sc02959h.

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49

Shen, Rong, Shengyu Feng y Hongzhi Liu. "Silsesquioxane-based luminescent PMMA nanocomposites". RSC Advances 6, n.º 64 (2016): 59305–12. http://dx.doi.org/10.1039/c6ra10165h.

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50

MARSMANN, H. C., U. DITTMAR y E. RIKOWSKI. "ChemInform Abstract: New Functionalized Silsesquioxanes by Substitutions and Cage Rearrangement of Octa((3-chloropropyl)-silsesquioxane)". ChemInform 27, n.º 51 (4 de agosto de 2010): no. http://dx.doi.org/10.1002/chin.199651305.

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