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Showing 1 to 20 of 44 for “"polymer blend"”.
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Determining the role of charges in ionic polymer blend systems
… about the effect of charge in ionic multi-polymeric systems. Theory has shown that many charged systems have unusual phase diagrams that are asymmetric. Such a phenomenon would be ideal for tuning domain sizes or obtaining nontraditional structures in materials. One of the two studies …
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Structure Formation and Crystallization in Two-Phase Polymer Blend Flows (Fibers, Polyethylene, Polypropylene)
… phenomenon of flow induced crystallization in polymer melts.
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Effect of Processing Techniques and Blend Compositions on Electrical Properties of Immiscible Polymer Blend/MWCNT Nanocomposites
… efficiency of electronic devices. Conductive polymer blend nanocomposite is a potential option to mitigate the challenges associated with commercially-used metal shields. This work aims to attain improved electrical conductivity, electromagnetic interference shielding effectiveness (EMI SE) …
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Electromechanical Characterization of Poly(Dimethyl Siloxane) Based Electroactive Polymers
… properties of the resulting CN-PDMS blend as an electroactive actuator. Materials responding to an external stimulus are referred to as electroactive materials. There are several phenomena, which govern the mechanism in these materials, such as piezoelectricity, Maxwell's effect, …
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Chemical analysis of polymer blends via synchrotron X-ray tomography
Material properties of industrial polymer blends are of great importance. X-ray tomography has been used to obtain spatial chemical information about various polymer blends. The spatial images are acquired with synchrotron X-ray tomography because of its rapidity, good spatial resolution, large …
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Cost-effective processing of immiscible polymer blends into value-added fiber-based products
… a motivation to study how to process immiscible polymer blends into value-added fiber-based products without using compatibilizers, which, on the other hand, are also helpful for the development of new polymer blend products. In this thesis study, we adopt a “nearly co-continuous structure” and …
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POLYMER ORGANIC SEMICONDUCTORS AND THEIR DEVICES
Organic semiconducting (OSC) polymers has been used in wide range of applications, such as light-emitting diodes, solar cells, and transistors. Here, different aspects regarding the optimization of this layer are discussed in their respective devices. Firstly, synthetic methodology based on Suzuki …
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Fabrication and characterization of co-continuous elastomer-hydrogel composites
The increasing demand of applications in polymer industry requires new or improved combinations of material properties, which cannot be satisfied by few polymers alone. There has therefore been scientific and industrial interest in mixing two different polymers together to make polymer blends. Of …
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High Performance Electrode Materials From Carbon Nanofibers with Tunable Pore Architectures
… and tested for electrochemical performance. The polymers were electrospun to obtain polymer fibers to yield carbon nanofibers (CNFs) upon pyrolysis. The effect of in-situ porogen was analyzed and utilized for preparation of high surface area CNFs. PI with the best performance (6FDA-DABA) was …
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Toughening mechanisms in composites of miscible polymer blends with rigid filler particles
Fillers are often added to polymers improve stiffness at the cost of reduced toughness, but this tradeoff is not universal. Well-dispersed microscopic particles have been shown to improve toughness and stiffness simultaneously in some cases. The effect depends on interparticle distance as well as …
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Hybrids Based on Layered Silicates
… silicates as inorganic core and well-defined polymer chains as a shell. In all cases positively charged 2-(dimethylamino)ethyl methacrylate (DMAEMA) was incorporated into the polymeric structure to serve as a firm anchor onto the negatively charged clay surface via electrostatic adsorption. …
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Increased Functionality Porous Optical Fiber Structures
… sulfonate) (PEDOT:PSS) and photoactive polymer blend poly(3- hexylthiophene) and 1-(3-methoxycarbonyl)-propyl-1-phenyl-)6,6)C61 (P3HT: PCBM) were deposited on the fibers using dip coating techniques. Quantum dots of Cadmium Selenide (CdSe) with particle sizes of ranging from 2- 10 nm …
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Polymeric and Polymer/Inorganic Composite Membranes for Proton Exchange Membrane Fuel Cells
… Nafion, the current perfluorosulfonic acid copolymer benchmark membrane for both DMFCs and hydrogen/air fuel cells, shows very high methanol crossover. Directly copolymerized disulfonated poly(arylene ether sulfone)s copolymers doped with zirconium phosphates and phenyl phosphonates were …
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Hybrid light emitting diodes based on solution processed polymers, colloidal quantum dots, and colloidal metal nanoparticles
… light-emitting devices based on polymer, polymer/PbS quantum dot, and polymer/silver nanoparticle hybrid materials. Solution based materials and organic/inorganic hybrid light emitting diodes attracted significant interest recently due to many of their advantages over conventional …
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Unexplored Dimensions of Processing Phase Inversion during Polymer Melt Blending
Blending of multiple polymers is a commonly utilized strategy to achieve a balance of a variety of critical properties of polymeric materials, such as strength, toughness, thermal stability, ductility, etc. Although exhaustive studies have helped understand the thermodynamic basis for the phase …
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Tribological behavior of unfilled and carbon fiber reinforced polyether ether ketone/polyether imide composites
… (PEEK) and Poly(ether imide) (PEI), PEEK/PEI blends with the weight compositions of 50/50 %, 70/30 %, and 85/15 %, with and without short carbon fibers were measured in a pin(52100 steel ball)-on-disk(polymer blend) configuration under dry friction. 50/50, 70/30, and 85/15 compositions were …
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Extrusion foaming of bioplastics for lightweight structure in food packaging
… for formulation development. The influence of blending with other biopolymers, inclusion of filler, and chain extender additives in terms of mechanical properties, rheology, thermal decomposition and crystallization kinetics were then followed. Creating lightweight structures by foaming is …
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Nano-structured materials for optoelectronic devices
… power conversion efficiency. We use diblock copolymer lithography combined with solvent-vapour-assisted imprinting to fabricate nano-structures with 20-80 nm feature sizes. We demonstrate nanostructured solar cell incorporating the high-performance polymer PBDTTT-CT. Furthermore, we …
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The preparation of high performance polymers for composites and blends: A) thermally stable ion containing polymers B) epoxy and hydroxy functional polyolefin macromers
… or soluble high performance ion containing polymers to be used as composite system interfacial modifiers and processing aids. In the first approach, thermally stable pyridine containing poly(ary/ene ether)s were designed which could be ionized by protonation in acidic aqueous media. A novel …
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Synthesis and Characterization of CdSe/ZnS Core/Shell Quantum Dot Sensitized PCPDTBT-P3HT:PCBM Organic Photovoltaics
<p>Durable, cheap, and lightweight polymer based solar cells are needed, if simply to meet the demand for decentralized electrical power production in traditionally “off-grid” areas. Using a blend of Poly(3-hexylthiophene-2,5-diyl) (P3HT), Phenyl-C61-butyric acid methyl ester (PCBM), and the low …
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