Additive Manufacturing of High‐Performance Engineering Polymers: Present and Future

2021 ◽  
Author(s):  
Cody W. Weyhrich ◽  
Timothy E. Long
Keyword(s):  
Additive Manufacturing ◽  
High Performance ◽  
Performance Engineering ◽  
Engineering Polymers

Reciprocating friction and wear of polyimide composites filled with solid lubricants

2018 ◽  
Vol 38 (4) ◽  
pp. 363-370 ◽  
Author(s):  
Jingfu Song ◽  
Gai Zhao ◽  
Qingjun Ding ◽  
Jinhao Qiu
Keyword(s):  
Friction Coefficient ◽  
High Performance ◽  
Friction And Wear ◽  
Solid Lubricants ◽  
Friction Reduction ◽  
Frictional Material ◽  
Performance Engineering ◽  
Ultrasonic Motors ◽  
Polyimide Composites ◽  
Engineering Polymers

AbstractHigh-performance engineering polymers are a potential frictional material candidate for mechanical systems with moving parts, especially at high load and speed conditions. In this study, reciprocating friction and wear of aramid fibers/polyimide composites filled with graphite, MoS2or Polytetrafluoroethylene, respectively, were systematically investigated on a Pin-on-Flat test rig. The experimental setup was simplified into friction materials reciprocating against a phosphor bronze pin to simulate the rotor/stator contact state in ultrasonic motors. A comparative study on friction reduction and wear resistance of polyimide composites indicated that graphite showed the best lubricity with low friction coefficient and wear rate. Experimental results of pressure time average velocity measurements showed that frequencies ranging from 3 to 11 Hz played a significant role on the friction coefficient variations of these porous polyimide composites, whereas increasing pressure from 4 to 6 MPa had little effect on friction reduction. Then, the microstructure of the worn surface of the three different materials was observed by scanning electron microscope to reveal the wear mechanisms. This study is expected to provide a good guidance for porous polyimide composites application in ultrasonic motors.

scholarly journals Melt Blowing Polyoxymethylene Copolymer

2005 ◽  
Vol os-14 (2) ◽  
pp. 1558925005os-14
Author(s):  
Ron (Rongguo) Zhao
Keyword(s):  
High Performance ◽  
Surface Friction ◽  
Hydrocarbon Fuel ◽  
Melt Blowing ◽  
Fluid Filtration ◽  
Performance Engineering ◽  
Wide Range ◽  
Strength And Stiffness ◽  
Engineering Polymers ◽  
Relationship Of

Polyoxymethylene (POM) copolymer is one of the relatively new, high performance engineering polymers. Its high crystallinity provides this polymer with excellent properties, including great tensile strength and stiffness, high toughness, good resilience, and low surface friction. POM also possesses excellent chemical resistance to a wide range of materials, comparing favorably with many thermoplastic polymers. Fine fibered products of POM may find applications in specialty filtration, such as hydrocarbon fuel filtration, and hydraulic fluid filtration. This paper discusses the melt blowing process for POM with an emphasis on the effects of spinnerette setting on the fiber property. It also discusses the relationship of process/web properties for this specific polymer and compares it with that of PP in terms of processability.

scholarly journals Additive Manufacturing of Sensors for Military Monitoring Applications

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1455
Author(s):  
David T. Bird ◽  
Nuggehalli M. Ravindra
Keyword(s):  
Additive Manufacturing ◽  
High Performance ◽  
Sensor Technology ◽  
Distinct Advantage ◽  
Industrial Sectors ◽  
Sensor Fabrication ◽  
The Us ◽  
3D Printed ◽  
Maximum Protection ◽  
The Many

The US Department of Defense (DoD) realizes the many uses of additive manufacturing (AM) as it has become a common fabrication technique for an extensive range of engineering components in several industrial sectors. 3D Printed (3DP) sensor technology offers high-performance features as a way to track individual warfighters on the battlefield, offering protection from threats such as weaponized toxins, bacteria or virus, with real-time monitoring of physiological events, advanced diagnostics, and connected feedback. Maximum protection of the warfighter gives a distinct advantage over adversaries by providing an enhanced awareness of situational threats on the battle field. There is a need to further explore aspects of AM such as higher printing resolution and efficiency, with faster print times and higher performance, sensitivity and optimized fabrication to ensure that soldiers are more safe and lethal to win our nation’s wars and come home safely. A review and comparison of various 3DP techniques for sensor fabrication is presented.

scholarly journals Poly(aryl imino sulfone)s as new high-performance engineering plastics

2011 ◽  
Vol 68 (1) ◽  
pp. 95-111 ◽  
Author(s):  
Guanjun Chang ◽  
Xuan Luo ◽  
Yi Xu ◽  
Hongju Hu ◽  
Lidong Wei ◽  
...  
Keyword(s):  
High Performance ◽  
Performance Engineering ◽  
Engineering Plastics
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