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Showing 1 to 20 of 28 for “"Polyetherimide"”.
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Synthesis and characterization of phenylethynyl endcapped polyetherimide oligomers
… used for the synthesis of high molecular weight polyetherimides. Both thermoplastic materials and thermosetting systems endcapped with either phthalic or phenylethynylphthalic anhydride, respectively, have been produced. Major emphasis has been placed on polyimides derived from 2,2’- …
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Modification and Upcycling of Polyetherimide, Polystyrene, Polyethylene, and Polypropylene
… In this dissertation, enhancing the property of polyetherimide (PEI) is first discussed, and two methods are introduced. Later, a new recycling strategy, the degradation-upcycling (Deg-Up) strategy, is presented. The potential of Deg-Up is evaluated on three plastics: polystyrene (PS), …
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Polymeric Melodies: Polyetherimide Modification-Based Acoustic Membranes and Sonochemical Degradation of Polystyrene
… In this dissertation, we have modified polyetherimide (PEI) using a crosslinking approach to enable the reinforcement of a thin film membrane via carbon nanotube embedding. In addition to the generation of nanocomposites, effective chemical recycling of waste plastics has become …
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The Effects of Electron Radiation on the Glass Transition Temperature of a Polyetherimide
<p>The effects of electron radiation on a polyetherimide (PEI), Ultem*, were investigated. In particular, the changes in the glass transition temperature (T<sub>g</sub>) with absorbed radiation dose were studied. The polymer was exposed to mono-energetic beams of 100-keV electrons and 1.0-MeV …
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Using Branching and Endgroups to Control the Physical Properties of Macromolecules: Systematic Studies of Etherimide Polymers
… properties, end-group modified hyperbranched polyetherimides were prepared by a one-pot, two-step reaction sequence. General synthetic techniques were developed to prepare both mono-functional terminating segments and the corresponding modified polyetherimide hyperbranched polymers. …
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Chromic acid anodized Ti-6Al-4V: its characterization and its single lap bond strength to heat resistant adhesives
… eolyethersulfone; polyphenylquinoxaline; polyetherimide, both unfilled and 20% glass filled; and 50% calcium carbonate filled polyimide. Hydrofluoric acid (HF) added to the CA anodization solution was necessary to produce structural bonds. CA/HF oxide was more porous, and thicker than the …
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The investigation of acid/base interactions in the adhesion of carbon fibers to thermoplastic matrices
… matrices (polysulfone, polycarbonate, and polyetherimide) exhibited basic properties. Single fiber fracture tests showed that increased acidity in the fiber surfaces (as a result of surface pretreatment) resulted in a significant improvement in the interfacial adhesion to the basic …
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Modification of Fused Filament Fabrication Printer to Print High Temperature Thermoplastics to Improve Z-Strength
… (PEEK), polyetherketoneketone (PEKK) and polyetherimide (PEI) were evaluated. The goal of developing the desktop 3D printer to print high temperature materials equivalent to high end printers was achieved. The testing concluded that the printer modifications were successful in improving …
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Free-Space Measurements of Dielectrics and Three-Dimensional Periodic Metamaterials
… intersecting at 90 degrees. The dielectric is a polyetherimide-based material 0.001” thick. Each sheet has a copper capacitively-loaded loop (CLL) structure on the front and a cut-wire structure on the back. Foam material is used to support the unit cells. The unit cell repeats 40 times in the …
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Fabrication of Graphene-Based Composites via High-Pressure Homogenisation and Their Characterisation
… different properties, polyamide 12 (PA12) and polyetherimide (PEI), are used to create polymer graphene masterbatches with graphene contents up to 50 wt%, subsequently mixed into raw polymer at graphene contents ranging from 0.1 to 10 wt%. The work demonstrates that the incorporation of …
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Molecular Modeling Studies of Dendrimers and Hyperbranched Polymers
… imine (Astramol) dendrimers and the AB/AB2 polyetherimide (PEI) hyperbranched copolymers, in the dilute and entangled states.
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Fundamental aspects of the tribological behavior of poly(ether-ether-ketone)-based in-situ composites at elevated temperatures
… TLCP, as well as on ternary blends of PEEK, Polyetherimide (PEI) and HX -1000. The specific tribological phenomenon investigated is unlubricated sliding. Friction and wear measurements are performed at selected temperatures in the range from 20°C to 250 °C using a pin-on-disk tribometer. …
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Spatially-Directed Interfacial Polymerization
… as a mean to produce nanotextured thermoformable polyetherimide films. While the ISIP technique facilitates composite formation within nanoporous materials, Interfacial Photopolymerization (IPP) enables photopolymerization printing of linear chain polymers without requiring a scaffold substrate. A …
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An investigation of the effects of shearfree deformation and the role of miscibility on the structure and properties of in situ thermoplastic composites
… liquid crystalline polymer (TLCP) with a polyetherimide (PEI) were used in the investigations. The blends were injection molded into mini-tensile bars and rectangular plaques, and their mechanical properties were evaluated. Interfacial, rheological, and morphological properties along with …
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Carbon fiber surface treatments for improved adhesion to thermoplastic polymers
… carbon fibers to polysulfone, polycarbonate, and polyetherimide was studied using the fiber critical length test. Oxygen and nitrogen were added to the fiber surfaces by anodization in amine salts. Analysis of the plasmon peak in the carbon 1s signal indicated that H₂SO₄ anodization affected the …
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Synthesis and Characterization of High Performance Polymers for Gas Separation and Water Purification Membranes and as Interfacial Agents for Thermplastic Carbon Fiber Composites
… agents for the fabrication of coated sub-micron polyetherimide (PEI) particles. Sub-micron particles were obtained using 1 wt% PAAS and 4 wt% sPI to coat the PEI. The PEI particles were coupled onto ozone treated carbon fibers using a silane coupling agent. SEM images showed a significant amount …
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All-atom and Coarse-grained Molecular Dynamics Modeling of Various Polymeric and Composite Materials
… methacrylate) (PAN-b-PMMA) copolymers, polyetherimide (PEI)-graphene composites, and epoxy network polymers, by bridging molecular-level behaviors and macroscopic thermomechanical properties. First, all-atom MD simulations are used to improve the design of porous carbon fibers derived …
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Processing Behavior of Thermoplastics Reinforced with Melt Processable Glasses
… consisting of polyphenylene sulfide (PPS), polyetherimide (PEI) and polyetheretherketone (PEEK) were combined with phosphate glasses having glass transition temperatures (Tg) that ranged from 230-290°C to form composite systems where both the matrix and reinforcing phase were deformable …
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COOLING THEORY FOR THERMOPLASTIC MATERIALS USED IN SCREW EXTRUSION ADDITIVE MANUFACTURING
… (ABS), polycarbonate (PC), and polyetherimide (PEI) play a strategic role in most applications. In addition, the research offers a physical, mechanical and thermal characterization of the printed workpiece providing a comprehensive guideline for part design, arrangement, and …
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Telechelic Polyetherimides with Functionalized End Groups for Enhancement of Mechanical Strength, Flame Retardancy, and Optical Properties
… the factors that affect the properties of polyetherimide (PEI) and improving the properties. As a high-performance thermoplastic resin, the first challenge in PEI application is its high processing temperature and viscosity. Therefore, two supramolecular strategies were applied to not only …
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