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Showing 1 to 17 of 17 for “"Ultem"”.
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Quasi-Static Tensile and Fatigue Behavior of Extrusion Additive Manufactured ULTEM 9085
… and cyclic fatigue tests were performed on ULTEM 9085 samples fabricated by fused deposition modeling (FDM). First, tensile tests were conducted following ASTM D638 on three different build orientations with default build parameters to determine the mechanical strength of FDM ULTEM 9085 with …
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An Investigation of the Structure-Property Relationships for High Performance Thermoplastic Matrix, Carbon Fiber Composites with a Tailored Polyimide Interphase
… The structure-property relationships of Ultem-type polyimide and BisP-BTDA polyimide which were made from various water soluble polyamic acid salts were studied. The molecular weight of the polyimides was shown to be dependant upon the selection of the base used for making the polyamic …
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Using 3D Printing to Improve the Impact Resistance of Sandwich Panels
… A uniform-density honeycomb core made from ULTEM-1010 was designed. It was then tested in quasi-static compression, bending and indentation, low-velocity impact and high-velocity impact regimes and then compared against two typical reference designs. The 3D printed ULTEM-1010 panel design …
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Studies of Radiation Effects in Three High Polymers
<p>Three high polymers, Mylar®, Ultem®, and Kapton®, were irradiated to total doses of 1, 5, and 9.5 gigarad using 1-MeV electrons. The glass transition temperatures (T<sub>g</sub>) of the materials before and after irradiation were measured using an AC electrical dissipation factor technique. From …
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Characterization of the Integration of Additively Manufactured All-Aromatic Polyimide and Conductive Direct-Write Silver Inks
… and relative to existing AM substrates, such as ULTEM 1010. The temperature stability of UV-DIW PI enabled higher-temperature post-processing for the printed silver traces, which decreased DIW trace resistivity from 14.94±0.55 times the value of bulk silver at 160 °C to 2.16±0.028 times the …
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Electrospinning as a Processing Method for Electroactive Polymers and Composites
… carbon nanotubes within the fibers. Ultem®/aligned single-walled carbon nanotube fiber nanocomposites were also fabricated; these showed evidence of enhanced piezoelectric strain response relative to fibers composed of the matrix alone. Thermal and static mechanical testing of all …
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Stereoscopic Particle Image Velocimetry Measurements of Swirl Distortion on a Full-Scale Turbofan Engine Inlet
… hybrid wing body applications and was made of Ultem*9085 using additive manufacturing. Additional improvements to the StreamVane method are also described. Data reduction algorithms are put forth to reduce spurious velocity vectors. Uncertainty estimations specific to the inlet distortion test …
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The Effects of Electron Radiation on the Glass Transition Temperature of a Polyetherimide
… 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 electrons for doses …
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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
… the same monomers used for the synthesis of Ultem® were utilized as suspending 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 …
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High performance polymeric networks and thermoplastic blends: microwave versus thermal processing
… electromagnetic processing was applied to PEEK™/Ultem™ blends to demonstrate the principles of "microwave calorimetry".
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Process and Material Modifications to Enable New Material for Material Extrusion Additive Manufacturing
… of thermal processing conditions for printing ULTEM® 1010 were studied by independently varying the i) nozzle temperature, ii) environment temperature, and iii) post-processing conditions. The nozzle temperature primarily enables flow through the nozzle and needs to be set to at least 360 °C to …
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Engineering nanoporous materials for application in gas separation membranes
… without sacrificing CO₂/CH₄ selectivity when Ultem® and Matrimd® were used as the polymer matrix. In contrast, mixed matrix membranes with the highly permeable polymer 6FDA-DAM showed substantial enhancement in both permeability and selectivity, as the transport properties of the two phases …
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Durability of Polyimide Adhesives and Their Bonded Joints for High Temperature Applications
… joints were compared and contrasted with VT Ultem and REGULUS polyimide adhesives. The FM-5 adhesive showed the best performance among the three adhesive systems. The effect of mode-mixity on the fracture toughness of the Ti-6Al-4V/FM-5 adhesive bonded system was also evaluated. DCB tests in …
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Synthesis and Characterization of Poly(siloxane imide) Block Copolymers and End-Functional Polyimides for Interphase Applications
… polyimide (amine end-functional and commercial Ultem™) and poly(siloxane imide) multiblock copolymers were prepared to evaluate the polymer-matrix interphase region. Atomic force microscopy (AFM) analysis of the bilayer films showed diffusion at the interphase for the bilayers prepared with the …
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Novel Monomer Design for Next-Generation Step-Growth Polymers
… comparison between a commercially relevant PEI (Ultem® 1000) and a regioisomer infrequently found in the literature. Thermal stability remained consistent for each regioisomer, and Tgs for the 3,3'- and 4,4'-LCB-PEIs agreed well with prior literature. Rheological analysis demonstrated typical …
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A Nacreous Self-Assembled Nanolaminate for Corrosion Resistance on 2024-Al Alloy
Nanometer thick layers of clay and polymer were formed on mica, silicon, and aluminum 2024-T3 alloy using alternating solutions of positively and negatively charged polymer and clay, respectively. Atomic force microscopy was used to observe the morphology of the composite films on mica and silicon. …
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Physics Based Modeling and Characterization of Filament Extrusion Additive Manufacturing
… polymer polyetherimide, specifically Ultem™ 1010, which had not been studied in prior modeling analyses but presents significant challenges in terms of large thermal gradients and challenging AM machine requirements. Through this analysis, it was discovered that convective cooling …