scholarly journals Coalescence in fused filament fabrication process: Thermo-dependent characterization of high-performance polymer properties

2021 ◽  
pp. 107096
Author(s):  
Arthur Lepoivre ◽  
Arthur Levy ◽  
Nicolas Boyard ◽  
Vincent Gaudefroy ◽  
Vincent Sobotka
Keyword(s):  
High Performance ◽  
Fabrication Process ◽  
Fused Filament Fabrication ◽  
Polymer Properties ◽  
High Performance Polymer

Nonvolatile resistive memories utilizing functional PES-based supramolecular film

2017 ◽  
Vol 30 (9) ◽  
pp. 1056-1063 ◽  
Author(s):  
Hejing Sun ◽  
Haibo Zhang ◽  
Zheng Chen ◽  
Jinhui Pang ◽  
Cong Gao ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
High Performance ◽  
Memory Device ◽  
Memory Devices ◽  
Resistive Switching Memory ◽  
Threshold Voltages ◽  
High Performance Polymer ◽  
Fabrication And Characterization ◽  
First Time

This study reports the fabrication and characterization of polymer resistive switching memory devices fabricated from poly(ether sulfone)s (PESs), containing carboxylic functional groups for hydrogen bonding with disperse red 1. PES-based supramolecular memory devices exhibited write-once read-many-times-type memory effects, with low switching threshold voltages below −5.0 V and high ON/OFF current ratios of 105. It is the first time that the concept of azobenzene supramolecular PES based on hydrogen bonding for electrical memory device application was investigated. A possible switching mechanism based on the charge transfer interaction was proposed through molecular simulation, optical absorption, and cyclic voltammetry. These results render the PES-based supramolecular memory devices as promising components for high-performance polymer memory devices.

Synthesis and characterization of a thiazolo[5,4-d]thiazole-based copolymer for high performance polymer solar cells

2011 ◽  
Vol 47 (6) ◽  
pp. 1791-1793 ◽  
Author(s):  
Sang Kyu Lee ◽  
Jung Min Cho ◽  
Youngran Goo ◽  
Won Suk Shin ◽  
Jong-Cheol Lee ◽  
...  
Keyword(s):  
Solar Cells ◽  
High Performance ◽  
Polymer Solar Cells ◽  
Synthesis And Characterization ◽  
High Performance Polymer

scholarly journals Bonding between high-performance polymer processed by Fused Filament Fabrication and PEEK/carbon fiber laminate

2021 ◽  
Author(s):  
Isciane Caprais ◽  
Pierre Joyot ◽  
Emmanuel Duc ◽  
Simon Deseur
Keyword(s):  
Additive Manufacturing ◽  
Composite Structures ◽  
Composite Laminate ◽  
High Performance ◽  
Processing Conditions ◽  
Fused Filament Fabrication ◽  
Fiber Placement ◽  
High Performance Polymer ◽  
Automated Fiber Placement ◽  
The Impact

Automated fiber placement processes could be combined with additive manufacturing to produce more functionally complex composite structures with more flexibility. The challenge is to add functions or reinforcements to PEEK/carbon composite parts manufactured by automated fiber placement process, with additive manufacturing by fused filament fabrication. This consists of extruding a molten polymer through a nozzle to create a 3D part. Bonding between polymer filaments is a thermally driven phenomenon and determines the integrity and the final mechanical strength of the printed part. 3d-printing high performance polymers is still very challenging because they involve high thermal gradients during the process. The purpose of this work is to find a process window where the bonding strength is maximized between the composite laminate and the first layer of printed polymer, and inside the printed function as well. Experimental measurements of the temperature profiles at the interface between a composite substrate and 3d-printed PEI under different processing conditions were carried out. The interface was observed using microscopic sections. The methodology for studying the impact of printing parameters on the cohesion and adhesion of printed parts with a composite laminate is described. This work provides insights about the influence of processing conditions on the bond formation between high-performance polymer surfaces. It highlights the importance of controlling the thermal history of the materials all along the process.

High Performance, Light weight Thermoplastic/Rare Earth Alloy Magnets

1999 ◽  
Vol 577 ◽  
Author(s):  
Jun Xiao ◽  
Joshua U. Otaigbe
Keyword(s):  
Rare Earth ◽  
High Performance ◽  
Mechanical Performance ◽  
High Strength ◽  
Polyphenylene Sulfide ◽  
Exploratory Research ◽  
Rare Earth Alloy ◽  
Crystal Polymer ◽  
High Performance Polymer

ABSTRACTWe report progress on our exploratory research on surface modification of magnetic NdFeB fillers, characterization of suitable magnetic rare earth alloy powders and high-performance polymer matrices, processability, and properties of novel thermoplastic/NdFeB magnets. The results suggest that blending liquid crystal polymer (LCP) with a high-thermoplastic polymer such as polyphenylene sulfide (PPS) provides the required balance of properties. These properties include superior magneto-mechanical performance, minimal melt viscosity at optimal NdFeB volume loading, enhanced thermal stability, high stiffness, high strength, improved dimensional stability, and excellent chemical resistance; making the thermoplastics magnets suitable for use in high temperature and aggressive environments where commercial polymer-bonded magnets are not useable.

Preparation and characterization of a new high-performance polymer composite and its application as a lead-free polymer-based projectile

2019 ◽  
Vol 32 (5) ◽  
pp. 550-558 ◽  
Author(s):  
Mehdi Derradji ◽  
Abdelrazak Mouloud ◽  
Djalal Trache ◽  
Abdeldjalil Zegaoui ◽  
Aboubakr Medjahed ◽  
...  
Keyword(s):  
Carbon Fibers ◽  
High Performance ◽  
Cost Effective ◽  
Major Type ◽  
Self Defense ◽  
High Performance Polymer ◽  
Conventional Weapons ◽  
Bismuth Oxide Nanoparticles ◽  
Surface Modified

Lead-based bullets are the major type of ammunition used all over the world. The high toxicity of this heavy metal directly affects the personnel manufacturing the projectiles and causes the contamination of the shooting ranges. To provide remedy, this work proposes cost-effective and highly performant polymer-based bullets intended to replace the traditional lead-based ones in a multitude of conventional weapons. The proposed new projectiles were elaborated from a high-performance phthalonitrile resin and several amounts of silane surface-modified chopped carbon fibers and bismuth oxide nanoparticles. The newly developed bullets were manufactured and tested for their precisions at 50 m and their velocities at 2 m from the barrel. The obtained results showed exceptional precisions with high velocities. Furthermore, the mechanical, thermal, and morphological investigations further confirmed the superior performances of these exceptional materials. It can be inferred that the produced bullets are suitable for ammunitions intended to be used for close combat and self-defense situations.

Fabrication and Characterization of High-Performance Polymer-Based Magnetoelectric DC Magnetic Field Sensors Devices

2017 ◽  
Vol 64 (6) ◽  
pp. 4928-4934 ◽  
Author(s):  
Silvia Reis ◽  
Nelson Castro ◽  
Marco P. Silva ◽  
Vitor Correia ◽  
Jose Gerardo Rocha ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Performance ◽  
Magnetic Field Sensors ◽  
Dc Magnetic Field ◽  
High Performance Polymer ◽  
Fabrication And Characterization

Characterization of high-performance polymer blends

1989 ◽  
Vol 47 ◽  
pp. 350-351
Author(s):  
R.T. Chen ◽  
J.J. Rafalko ◽  
L.C. Sawyer
Keyword(s):  
Polymer Blends ◽  
High Performance ◽  
Complete Understanding ◽  
Concentrated Solutions ◽  
Aerospace Applications ◽  
Performance Requirements ◽  
Miscible Blends ◽  
High Performance Polymer ◽  
End Use

Blending of polymers, a method used to engineer materials to provide specific properties, has been extended to high performance materials being developed for composite applications in the aerospace industry. The high performance requirements of such blends demand a complete understanding of the chemistry and morphology as a function of end-use temperatures. Multidisciplinary protocols for characterization of blends include microscopy, infrared and thermal analysis. The major issues involved in such a study of polymer blends will be described.Recently the Hoechst Celanese polybenzimidazole, [poly-2,2′(m-phenylene)-5,5′ bibenzimidazole], PBI, and the General Electric aromatic polyether imide [poly(2,2′-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane-m-phenylenediimine], Ultem 1000, which are being evaluated for aerospace applications, were found to form miscible blends. The large parts are being fabricated from fibers spun from concentrated solutions (dopes).

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