scholarly journals A Case Study of Polyether Ether Ketone (I): Investigating the Thermal and Fire Behavior of a High-Performance Material

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1789
Author(s):  
Aditya Ramgobin ◽  
Gaëlle Fontaine ◽  
Serge Bourbigot
Keyword(s):  
Heat Flux ◽  
Thermal Decomposition ◽  
Fire Resistance ◽  
High Performance ◽  
Fire Behavior ◽  
Gas Chromatography Mass Spectrometry ◽  
Thermal Decomposition Mechanism ◽  
Loss Cone ◽  
Polyether Ether Ketone ◽  
Ether Ketone

The thermal and fire behaviors of a high-performance polymeric material—polyether ether ketone (PEEK) was investigated. The TG plots of PEEK under different oxygen concentrations revealed that the initial step of thermal decomposition does not greatly depend on the oxygen level. However, oxygen concentration plays a major role in the subsequent decomposition steps. In order to understand the thermal decomposition mechanism of PEEK several methods were employed, i.e., pyrolysis–gas chromatography–mass spectrometry (Py–GC–MS), thermogravimetric analysis (TGA) coupled with a Fourier-transform infrared spectrometer (FTIR). It was observed that the initial decomposition step of the material may lead to the release of noncombustible gases and the formation of a highly crosslinked graphite-like carbonaceous structure. Moreover, during the mass loss cone calorimetry test, PEEK has shown excellent charring and fire resistance when it is subjected to an incident heat flux of 50 kW/m². Based on the fire behavior and the identification of pyrolysis gases evolved during the decomposition of PEEK, the enhanced fire resistance of PEEK was assigned to the dilution of the flammable decomposition gases as well as the formation of a protective graphite-like charred structure during its decomposition. Moreover, at 60 kW/m², ignition occurred more quickly. This is because a higher rate of release of decomposition products is achieved at such a heat flux, causing a higher concentration of combustibles, thus an earlier ignition. However, the peak of heat release rate of the material did not exceed 125 kW/m².

Studying Mechanical Properties Specially Fatigue Behavior of (Polyether Ether Ketone)/Glass Fiber Composites in Aerospace Applications

2014 ◽  
Vol 666 ◽  
pp. 8-16
Author(s):  
A. Saad Najim ◽  
Mohammed Adwaa
Keyword(s):  
Mechanical Properties ◽  
Glass Fiber ◽  
High Performance ◽  
Fatigue Behavior ◽  
Fatigue Properties ◽  
Glass Fiber Composites ◽  
Aerospace Applications ◽  
Polyether Ether Ketone ◽  
High Performance Composite ◽  
Ether Ketone

This work deals with studying the mechanical properties specially fatigue behavior for high performance composite materials of poly ether ether ketone (PEEK)/glass fiber, which are used in Aircraft Industry. Two materials have been used: (PEEK natural) and (PEEK+30% glass fiber).To identify the type of (PEEK), infrared (FTIR) test has been conducted. X-ray test has been used to measure the (PEEK) crystalline ,also the tensile properties, impact strength and the fatigue test are performed.The results show that FTIR test peaks are for standard PEEK polymer and that GFRP increases the crystalline of (PEEK) material , while the tensile , impact and fatigue properties of (PEEK) decreases by adding GF to PEEK .

scholarly journals Esthetic rehabilitation with modified PEEK using analogue-digital protocol

2021 ◽  
Vol 7 (2) ◽  
pp. 109-113
Author(s):  
Vijaya Kumar R ◽  
Rahul Bahri ◽  
Parag Dua ◽  
Avina Banari
Keyword(s):  
High Performance ◽  
Biological Tissues ◽  
Missing Teeth ◽  
Long Span ◽  
Anterior Teeth ◽  
Polyether Ether Ketone ◽  
High Performance Polymer ◽  
Literature Evidence ◽  
Cad Cam ◽  
Ether Ketone

With the advancing digital technology and introduction of newer biocompatible materials with properties similar to biological tissues, CAD CAM fabricated restorations are gaining wide popularity. Introduction of Zirconia and BioHPP (High Performance Polymer) Polyether-ether-ketone (PEEK) has widened the horizons of clinical prosthodontics. Its use has been successfully demonstrated in implantology for fabrication of frameworks and as substructures for replacement of missing teeth. Literature evidence and clinical reports highlighting their usage for long span FDPs is however scanty. This article aims to highlight a combination of digital-analogue procedure for successful rehabilitation of mutilated and missing anterior teeth in a young adult using virtual articulator, modified Bio-HPP PEEK restorations and manufacturer recommended Visio.lign system.

An overview on the progress and development of modified sulfonated polyether ether ketone membranes for vanadium redox flow battery applications

2021 ◽  
pp. 095400832110493
Author(s):  
Baye Gueye Thiam ◽  
Anouar El Magri ◽  
Sébastien Vaudreuil
Keyword(s):  
High Performance ◽  
Low Cost ◽  
Vanadium Redox Flow Battery ◽  
Commercial Application ◽  
Redox Flow Battery ◽  
Research Activities ◽  
Polyether Ether Ketone ◽  
Sulfonated Polyether Ether Ketone ◽  
Ether Ketone ◽  
Vanadium Redox

Vanadium redox flow batteries (VRFB) are among the most promising approaches to efficiently store renewable energies. In such battery type, Nafion is commonly used as membrane material but suffers from high vanadium crossover and cost. These drawbacks negatively influence the widespread commercial application of VRFBs. Alternative membrane materials with high performance and low cost are thus being developed to address these shortfalls. Among those, possible materials for the VRFB membrane is sulfonated polyether ether ketone (SPEEK), which recently attracted considerable attention due to its low cost, combined with mechanical and chemical stability, and ease of preparation. This review summarizes the research activities related to the development of SPEEK-based membranes for VRFB applications and gives an overview of the properties of PEEK and its sulfonated form. A critical analysis on the challenges of SPEEK-based membranes is also discussed.

Preparation and properties of a novel, high-performance polyether ether ketone fabric

2017 ◽  
Vol 30 (7) ◽  
pp. 794-802 ◽  
Author(s):  
Chaolong Wang ◽  
Jiashuang Luan ◽  
Zhiping Xu ◽  
Wenyan Zhao ◽  
Mei Zhang
Keyword(s):  
Corrosion Resistance ◽  
High Performance ◽  
Melt Spinning ◽  
Breaking Strength ◽  
Testing Machine ◽  
Control Group ◽  
High Concentration ◽  
Tensile Testing Machine ◽  
Polyether Ether Ketone ◽  
Ether Ketone

In this study, polyether ether ketone (PEEK) fibers were produced by melt spinning method and woven to form fabrics. Several characterization tests were conducted with fiber tensile testing machine, scanning electron microscope, and differential scanning calorimeter to investigate the basic properties of PEEK fibers. Electric fabric strength, thermal performance, and corrosion resistance of PEEK fabric were also investigated. The commercial samples of NomexIIIA (imported) and Aramid1313 fabrics (made in China) were selected as control groups to evaluate the performance of developed fabrics. The results indicate that the PEEK fabrics have higher breaking strength, better corrosion resistance, and greater thermal stability than the other two commercial fabrics in the control group. The total friction of the PEEK fabric reached 30,000 times when two separate yarns in fabric were broken completely, and the breaking strength was in the range of 830–1422 N. The surface of PEEK fibers remained smooth, and there was no deformation after handling by 30% sodium hydroxide and 36% hydrochloric acid for 48 h; additionally, there was no weight loss. The melting point of PEEK fabric was 342.89°C, and it lost 5% of its weight at 574°C. The research shows that as a novel high-performance textile, PEEK fabrics with a long service temperature of 260°C have significant advantages in the improvement of corrosion resistance and mechanical properties of textiles, especially enhancing the stability under high-concentration alkaline environment. This work can provide novel avenues for the development of high-performance fibers and products with applications in special harsh environments.

An Experimental Study on the Fire Behavior of Concrete Segments in Tunnel Linings

2011 ◽  
Vol 82 ◽  
pp. 527-532 ◽  
Author(s):  
Kyung Hoon Park ◽  
Heung Youl Kim ◽  
Byung Youl Min
Keyword(s):  
Fire Resistance ◽  
High Performance ◽  
High Performance Concrete ◽  
Fire Behavior ◽  
Concrete Lining ◽  
European Federation ◽  
Structural Members ◽  
Transverse Pressure ◽  
C Segments ◽  
Full Scale Tests

As soon as the plan to build deep and long tunnels in Korea was announced, guaranteeing fire-resistance of R/C tunnel linings became an important issue. As a matter of fact, the R/C segments used in bored tunnels are structural members which are requested to resist both the transverse pressure of the soil and the longitudinal thrust of the TBM. Because of the temperature sensitivity of the high-performance concrete (compressive strength>40 MPa) that will be used, proper measures should be taken against possible fire-induced damage, like surface spalling and deterioration of the reinforcement. In the past, concrete linings were built in Korea with scanty attention to their fire safety, as demonstrated by the lack of studies on fire resistance of both materials and structures. Therefore, in this study the objective is how to improve the safety of R/C tunnel linings in case of fire, by comparing the damage observed in some full-scale tests recently performance in Korea with the damage observed in the tests performed by EFNARC (European Federation of Producer and Applicators of Specialist Products for Structures) and by investigating the fire behavior of a concrete lining as a whole.

scholarly journals A Novel Class of Cost Effective and High Performance Composites Based on Terephthalate Salts Reinforced Polyether Ether Ketone

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2097 ◽  
Author(s):  
Franco Dominici ◽  
Debora Puglia ◽  
Francesca Luzi ◽  
Fabrizio Sarasini ◽  
Marco Rallini ◽  
...  
Keyword(s):  
High Performance ◽  
Cost Effective ◽  
Thermal Characterization ◽  
Fracture Morphology ◽  
Melt Processing ◽  
Application Range ◽  
Chain Mobility ◽  
Polyether Ether Ketone ◽  
Ether Ketone ◽  
And Shifts

Poly(ether ether ketone) (PEEK)-based nanocomposites have been realized with incorporation (0–30 wt %) of anhydrous calcium terephthalate salts (CATAS), synthetized by reaction of terephtalic acid with the metal (Ca) oxide, by means of a melt processing. Their structure, morphology, thermal, and mechanical properties have been investigated. Scanning electron microscopy observations confirmed homogeneous dispersion of nanometer-sized fillers and a toughened fracture morphology even at the higher content, while thermal characterization confirmed an unvaried thermal stability and unmodified crystalline structure of the reference PEEK matrix. A negligible nucleating effect was evidenced, while a blocking effect of the amorphous phase fraction provide composites with increased stiffness, confirmed by enhanced values of G’ and shifts of glass transition peak to higher temperatures, for restriction in chain mobility imposed by CATAS. The proposed solutions aimed to enlarge the application range of high performance costly PEEK-based composites, by using thermally stable nanofillers with limited costs and easily controllable synthesis phase.

Study of the Effect of Processing Cycles on the Thermophysical Properties of Polyether Ether Ketone

2018 ◽  
Vol 935 ◽  
pp. 40-44 ◽  
Author(s):  
Azamat A. Zhansitov ◽  
Albert S. Shabaev ◽  
K.T. Shakhmurzova ◽  
Zh.I. Kurdanova ◽  
Rustam M. Mamkhegov ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Differential Scanning Calorimetry ◽  
Thermal Decomposition ◽  
Thermophysical Properties ◽  
Degradation Products ◽  
Scanning Calorimetry ◽  
Polyether Ether Ketone ◽  
Ether Ketone ◽  
Decomposition Schemes ◽  
Melting And Crystallization

The effect of heating cycles of polyether ether ketone up to 420 °C on the thermophysical properties was studied by the method of differential-scanning calorimetry. It is shown that with each subsequent heating the glass transition temperature increases, while the melting and crystallization temperature decreases, which may indicate an increase in the molecular weight of the polymer due to the structuring processes. The main degradation products of polyether ether ketone in air at temperatures of 350-450 °C were determined by gas chromatography and thermal decomposition schemes were proposed.

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