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Showing 1 to 20 of 49 for “"POSS"”.
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Optimization Problems in Hilbert Space with POSS Complexes.
… polyhedral oligomeric silsesquioxane (POSS) cage molecules. Second-quantized methods motivate the derivations throughout.</p>
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Phase and Rheological Behavior of Langmuir Films at the Air/Water Interface: Polyhederal Oligomeric Silsesquioxanes (POSS), POSS/Polymer Blends, and Magnetic Nanoparticles
… films of polyhedral oligomeric silsesquioxane (POSS), polymer blends, and magnetic nanoparticles (MNPs). In a first time, SLS is employed to study POSS molecules. The interfacial rheological properties of trisilanolisobutyl-POSS (TiBuP) indicate that TiBuP forms a viscoelastic Langmuir film that …
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The Effect of POSS Modified Montmorillonite On Elastomer Nanocomposites
… when polyhedral oligomeric silsesquioxane (POSS) is used as a dispersant. POSS has been shown previously to enhance clay, metal oxides, and carbon nanotube dispersion in thermoplastics matrices, but their performance in rubber systems has not yet been explored. There is little fundamental …
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Synthesis and Characterization of Polyhedral Oligomeric Silsesquioxane (POSS) Based Amphiphiles
Polyhedral oligomeric silsesquioxanes (POSS) have attracted substantial academic interest for many years as hybrid materials and nanofillers for controlling thermal and mechanical properties, and providing thermal and chemical resistance while retaining ease of processing. A natural extension of …
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Synthesis and Characterization of Polyhedral Oligomeric Silsesquioxane (POSS) Based Amphiphiles
Polyhedral oligomeric silsesquioxanes (POSS) have attracted substantial academic interest for many years as hybrid materials and nanofillers for controlling thermal and mechanical properties, and for providing thermal and chemical resistance while retaining ease of processing. A natural extension …
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Structure/Property/Processing Relationships in Poss-Modified High Temperature Thermoplastic Composites
… such as polyhedral oligomeric silsesquioxane (POSS) can significantly improve the processability of said thermoplastics at low percent loadings. However, as with any additive, maintaining molecular dispersion of the additives throughout the polymer matrix is crucial to achieving the desired …
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Rate-dependent deformation behavior of poss-filled and plasticized poly(vinyl chloride)
… on polyhedral oligomeric silsesquioxanes (POSS) enhanced polymeric systems. POSS are hybrid organic-inorganic nano-scale molecules which consist of a silica cage with functional groups attached to the cage comers. Various binary and ternary polymer blends were produced by incorporating …
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Quartz Crystal Microbalance Studies of Dimethyl Methylphosphonate Sorption Into Trisilanolphenyl-Poss Films
… (DMMP), a CWA simulant, into trisilanolphenyl-POSS (TPP) films has previously been characterized with reflection absorption infrared spectroscopy, x-ray photoelectron spectroscopy, and uptake coefficient determinations [1]. In our study, the quartz crystal microbalance (QCM) is used to study …
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Optical and thermal characteristics of thin polymer and polhedral oligomeric silsesquioxane (POSS) filled polymer films
… of a film's thickness and refractive index are possible. Poly(tert-butyl acrylate) (PtBA) films serve as a model system for the simultaneous determination of thickness and refractive index (1.45 at 632 nm). Thickness measurements on films of variable thickness agree with X-ray reflectivity …
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Interfacial Characterization of Polyhedral Oligomeric Silsesquioxane (POSS) Amphiphiles and Polymer Blends: Thermodynamics, Morphology, and Rheology
… polyhedral oligomeric silsesquioxanes (POSS), has attracted considerable attention because of their unique hybrid organic/inorganic molecular structures and nanoscopic sizes. While surface and interfacial properties may play a key role in many potential POSS applications, relatively …
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Structure and Dynamics of Polyhedral Oligomeric Silsesquioxane (POSS) and Poly(Ethylene Glycol) (PEG) Based Amphiphiles as Langmuir Monolayers at the Air/Water Interface
… of novel polymeric surfactants, telechelic (POSS-PEG-POSS) and hemi-telechelic (POSS-PEG) polyhedral oligomeric silsesquioxane (POSS) derivatives of PEG. PEO with number average molar mass, Mn > ~ 18 kg·mol-1 form stable spread Langmuir films at the A/W interface, while oligomeric PEG have ï …
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Thermomechanical properties of polyhedral oligomeric silsequioxane- poly(methyl methacrylate) nanocomposites
… containing polyhedral oligomeric silsesquioxane (POSS) nanoparticles (d [approx.] 1.5 nm) were subjected to heological, mechanical, and morphological tests to determine the effects that POSS has on the melt-state and solid-state properties of this commercially important amorphous polymer. The …
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Role of surface chemistry in sub-Einstein rheology of nano-composites
… of polyhedral oligomeric silisequioxane (POSS) particles of approximately 1.6-2.5 nm diameters as a function of polymer molecular weight. These nanoparticles consist of cubes of 8-corner silicon atoms edge bridged with oxygen atoms. A variety of functional groups are attached to the corner …
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MULTI-IONIC LITHIUM SALTS FOR USE IN SOLID POLYMER ELECTROLYTES FOR LITHIUM BATTERIES
… can self-assemble in polar media. Further, it is possible that these salts may not form non-conductive ion pairs and less conductive ion triplets. First, we have prepared nanocomposite electrolytes from mixtures of two polyoctahedral silsesquioxanes (POSS) nanomaterials, each with a SiO1.5 core …
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Atomistic simulations of octacyclopentyl polyhedral oligomeric silsesquioxane polyethylene nanocomposites
… nanotubes, polyhedral oligomeric silsesquioxane (POSS), and layered silicates have already been successfully used to improve the thermal and mechanical properties of polymers. On this length scale, details describing particle organization, interaction between particles, and interactions between …
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Design and Characterisation of Hybrid Organic-Inorganic Materials for Luminescence Downshifting Devices
… polyhedral oligomeric silsesquioxane (POSS) nanoparticles are investigated. POSS nanoparticles consist of a silica-based nanocage with highly tunable organic substituents on each Si vertex, and their organic polymer composites have previously exhibited reinforced mechanical and thermal …
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Deformation induced molecular behavior of Cis 1,4-polyisoprene and its nanocomposites monitored by solid-state NMR
… and polyhedral oligomeric silsesquioxane (POSS) nanofillers. The high frequency relaxations monitored by NMR are sensitivity to changes in the environment of polyisoprene chains as a function of compressive strain. These are the first experiments to use magic angle spinning nuclear magnetic …
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Surface Characterization of Siloxane, Silsesquioxane, and Maleic Anhydride Containing Polymers at Air/Liquid Interfaces
… of polyhedral oligomeric silsesquioxanes (POSS) was examined using a combination of LB and Brewster angle microscopy (BAM).Polymer fillers have been shown to reduce the cost and often improve the properties of high performance polymer composites. The utility of POSS as a potential …
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