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Showing 1 to 20 of 113 for “"Polymer nanocomposites"”.
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Biobased And Biodegradable Polymer Nanocomposites
… and crosslinked biobased and biodegradable polymer nanocomposites were fabricated and characterized. The properties of these polymer nanocomposites, and their relating mechanisms and corresponding applications were studied and discussed in depth. Chapter 1 introduces the research background …
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Synthesis and characterization of polymer nanocomposites
Polymer nanocomposites were produced by solution mixing of a commercial flexible acrylic polymer paint, with nanofillers of different size, shape, aspect ratio and purity such as hydrotalcite (HT), sodium montmorillonite (MMT), single wall carbon nanotubes (SWNT) and fullerenes (FUL), at 5 and 10 …
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Concurrently coupled multiscale modeling of polymer nanocomposites
… being implemented for amorphous materials like polymers, due to the fact that they lack specific ordered lattice structure and atoms may not be covalently bonded with each other, which are the requirements of common coupling schemes. Therefore, a new approach needs to be developed to resolve …
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Studies on semiconductor nanoparticles and polymer nanocomposites
… of semiconductor nanoparticles and semiconductor-polymer nanocomposites. The strategy for the synthesis of nanoparticles involves the use of various single-source precursors, which are thermolysed in a coordinating solvent, tri-w-octylphosphine oxide (TOPO). In the present study the focus has been …
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Carbon-based polymer nanocomposites for 3D-printing
In this PhD project, novel polymer nanocomposites are developed with the aim to increase the performances of 3D-printed parts obtained by fused deposition modeling (FDM). The attention is focused on carbon-based nanomaterials incorporated into an acrylonitrile–butadiene–styrene (ABS) polymer by a …
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Nano-Micromechanics: Modeling theEffective Response of Polymer Nanocomposites
… revolutionize the field of composite materials. Nanocomposites can exhibit strikingly different material properties than their macroscale counterparts; often at significantly lower volume fractions. A key mechanism contributing to these novel effects is the scale of the included phase itself. …
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Local and Effective Mechanical Properties of Polymer Nanocomposites
The study on the effect of nanospheres on the mechanical property improvement of epoxies pointed to the fact that nanostructured materials provide improvements mainly on the toughness of an epoxy. In this regard, local information of the interfacial properties of embedded nanoparticles can be the …
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Microscopic theory for dynamics in entangled polymer nanocomposites
… microscopic theories for describing dynamics in polymer nanocomposites are developed and applied. The problem is addressed from two distinct perspectives and using two different theoretical approaches. The first half of this dissertation studies the long-time and intermediate-time dynamics of …
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Mechanics of deformation of carbon nanotube-polymer nanocomposites
The goal is to develop finite element techniques to evaluate the mechanical behavior of carbon nanotube enabled composites and gain a thorough understanding of the parameters that affect the properties of the composite, both micro- and macroscopically. Micromechanical models of representative …
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Water vapor diffusion through glass fiber reinforced polymer nanocomposites
… delamination. The use of glass-fiber-reinforced nanocomposites made by addition of nanoclay, reduces the fiber damage and delamination because of its ability to enhance the barrier property of the matrix material. Clay not only acts as a barrier toward moisture diffusion, it also sequesters the …
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Bulk and Interfacial Effects on Density in Polymer Nanocomposites
The barrier properties of polymers are a significant factor in determining the shelf or device lifetime in polymer packaging. Nanocomposites developed from the dispersion of nanometer thick platelets into a host polymer matrix have shown much promise. The magnitude of the benefit on permeability …
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Polymer nanocomposites characterization by a stochastic finite elements representation
… for determining the mechanical properties of polymer nanocomposites (PNC) consisting of polymers reinforced with single-wall carbon nanotubes (SWCNT). Obviously, reliable characterization of the various properties of nanomaterials such as PNC is indispensable in engineering applications. In …
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From Nanoplates to Bottlebrushes: Engineering Thermodynamics in Polymer Nanocomposites
Polymer nanocomposites (PNCs) represent a diverse class of materials where manipulating design parameters is crucial for tailoring material properties. Of utmost importance for nanocomposites is nanoparticle dispersion, which is affected by the nanoparticle itself as well as the overall polymer …
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Molecular Dynamics Simulation Of Polymer Nanocomposites In Extreme Environments
… PEO system improves the thermal stability of the polymer in both decomposition modes. A delay in the temperature of the onset of decomposition in the non-isothermal mode and a nearly 60% increase in the activation energy of decomposition in the isothermal mode is observed for the PEO-PG system. …
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Use of Rheology to Assess Structures in Polymer Nanocomposites
… to improve physico-mechanical properties of polymeric matrices have been the major research interest in composite science area in recent years. In many cases the so-called improved properties are considered to be linked to the irreversible particle aggregation, leading to formation of fractal …
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Processing melt blended polymer nanocomposites using a novel laboratory mini-mixer. Development of polymer nanocomposites in the melt phase using a novel mini-mixer.
… into the processing conditions and parameters of polymeric nanocomposites has always been challenging to scientists and engineers alike. Many have developed tools and procedures to allow materials to be exploited and their properties improved with the addition of nanofillers to achieve the desired …
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Mechanical and interfacial properties of carbon nanofibers for polymer nanocomposites
… this work, the strength of the carbon nanofiber-polymer matrix interfaces was also quantified for the frrst time by means of novel nanoscale fiber pull-out experiments. The interfacial shear strength averaged 55 MPa revealing that the adhesion and bonding of the heat-treated, non-functionalized …
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Three-dimensional constitutive relations of aligned carbon nanotube polymer nanocomposites
We have created a set of decision support tools to streamline the surgical case scheduling process by allowing surgical wait list cases (elective cases that cannot be assigned a slot on the operating room schedule at the time of booking) to be confirmed onto the operating room schedule up to three …
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Innovative, Platy Nano-Additives as Efficient Flame Retardants for Polymer Nanocomposites
… as innovative flame retardants for polymer nanocomposites. In particular, polystyrene (PS) nanocomposites were prepared with a variety of nano-additives including layered double hydroxides (LDHs), hectorite (hect), graphite oxide (GO), or a combination of these. The maximum flame …
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Coarse-grained simulations to predict structure and properties of polymer nanocomposites
Polymer Nanocomposites (PNC) are a new class of materials characterized by their large interfacial areas between the host polymer and nanofiller. This unique feature, due to the size of the nanofiller, is understood to be the cause of enhanced mechanical, electrical, optical, and barrier properties …
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