scholarly journals Dielectric and thermal properties of magnesium oxide/poly(aryl ether ketone) nanocomposites

2018 ◽  
Vol 25 (5) ◽  
pp. 915-925 ◽  
Author(s):  
Virappa Virupaxappa Pattanshetti ◽  
G.M. Shashidhara ◽  
Mysore Guruswamy Veena
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Magnesium Oxide ◽  
Coefficient Of Thermal Expansion ◽  
Thermal Studies ◽  
Aryl Ether ◽  
Scanning Calorimetry ◽  
Aryl Ether Ketone ◽  
Ether Ketone ◽  
Dielectric And Thermal Properties

AbstractIn the present study, dielectric and thermal properties of poly(aryl ether ketone) (PAEK)-nanocomposites with varying weight percentage of magnesium oxide (MgO) have been reported. The thermal properties of PAEK/MgO nanocomposites were studied using differential scanning calorimetry, thermogravimetric analysis, thermo-mechanical analysis and thermal conductivity. Transmission electron microscopy of the developed nanocomposites shows agglomerate-free dispersion of MgO nanoparticles in PAEK matrix. From the dielectric properties, dielectric constant of 13 was achieved for 10 wt% PAEK/MgO nanocomposite at 230°C. Further, minimum tan δ and maximum volume resistivity were found for 10 wt% PAEK/MgO nanocomposite. Data from thermal studies indicate that the incorporation of MgO into PAEK significantly enhanced the glass transition temperature and slightly deteriorated the thermal stability, char yield, and flame-retardant properties. Also, highest thermal conductivity and lowest coefficient of thermal expansion were achieved at 10 wt% of the MgO content. An excellent combination of both dielectric and thermal properties of the PAEK/MgO nanocomposites developed in the present study finds its potential application in microelectronics and electrical insulation in power equipments.

Relationship between molecular structure and thermal properties of poly(aryl ether ketone)s

1997 ◽  
Vol 18 (2) ◽  
pp. 99-105 ◽  
Author(s):  
Mitsuhiro Shibata ◽  
Ryutoku Yosomiya ◽  
Junzuo Wang ◽  
Yubin Zheng ◽  
Wanjin Zhang ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Thermal Properties ◽  
Aryl Ether ◽  
Aryl Ether Ketone ◽  
Ether Ketone

Comparison of the structure and thermal properties of a poly(aryl ether ketone ether ketone naphthyl ketone) with those of poly(aryl ether ketone ether ketone ketone)

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Marcel Dosière ◽  
Didier Villers ◽  
Mikhail G. Zolotukhin ◽  
Michel H.J. Koch
Keyword(s):  
Glass Transition ◽  
Thermal Properties ◽  
Acid Chloride ◽  
Unit Cell ◽  
Aluminium Chloride ◽  
Aryl Ether ◽  
Orthorhombic Unit Cell ◽  
Melting Temperatures ◽  
Aryl Ether Ketone ◽  
Ether Ketone

AbstractPoly(oxy-1,4-phenylene carbonyl-1,4-phenylene oxy-1,4-phenylene carbonyl-2,6-naphthalene carbonyl-1,4-phenylene) or 2,6-PEKEKNK is a polymer of the poly(aryl ether ketone) family differing from PEKEKK by the presence of a naphthyl group linked at positions 2 and 6 to the two ketone groups. It is synthesized by electrophilic precipitation polycondensation of 2,6- naphthalenedicarboxylic acid chloride with 4,4’-bis-(4-phenoxy) benzophenone in the presence of aluminium chloride. The dimensions of the orthorhombic unit cell determined from an initially amorphous, stretched film are: a = 0.778 nm, b = 0.613 nm, c = 5.52 nm. In contrast with PEKEKK no signs of polymorphism were found for 2,6 PEKEKNK. Its glass transition and melting temperatures are 20 °C and 2 °C above those of PEKEKK, respectively.

Novel poly(aryl ether ketone)s with anthracene in the backbone

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Na Ying ◽  
Zhang Haibo ◽  
Zhang Yunhe ◽  
Niu Yaming ◽  
Jiang Sibo ◽  
...  
Keyword(s):  
Nitrogen Atmosphere ◽  
Nucleophilic Aromatic Substitution ◽  
Aromatic Substitution ◽  
Aryl Ether ◽  
Scanning Calorimetry ◽  
Good Thermal Stability ◽  
Good Solubility ◽  
Aryl Ether Ketone ◽  
Ether Ketone ◽  
First Time

AbstractTwo novel poly (aryl ether ketone)s with anthracene moieties in the backbone were synthesized through the conventional nucleophilic aromatic substitution polycondensation for the first time, by using a new bisfluoro monomer, 9,10-bis(4-fluorobenzoyl) anthracene (AnBF). The structures of obtained polymers were confirmed by NMR, IR and UV characterizations. The polymers have high molecular weight and show good solubility in common organic solvents. Differential Scanning Calorimetry (DSC) indicates that they are vitrified polymers with high glass transition temperatures above 188° Thermogravimetric analysis (TGA) shows that these polymers have good thermal stability in nitrogen atmosphere with a 5% weight loss (TGA-5%) above 465°.

The Enthalpic Relaxation of Amorphous Poly(Aryl Ether Ketone)s

1997 ◽  
Vol 9 (1) ◽  
pp. 1-15 ◽  
Author(s):  
A A Goodwin ◽  
M M Browne
Keyword(s):  
Physical Aging ◽  
Aryl Ether ◽  
Forming Process ◽  
Scanning Calorimetry ◽  
Substitution Pattern ◽  
Glass Forming ◽  
Aryl Ether Ketone ◽  
Ether Ketone ◽  
Composite Curve ◽  
Kinetics Of

The development of physical aging in four amorphous poly(aryl ether ketone)s at temperatures below the glass transition temperature, Tg, was studied using differential scanning calorimetry (DSC). The change in enthalpy lost on aging, determined by scanning through Tg, was used to determine the kinetics of the aging process through fitting to the Cowie–Ferguson model. The kinetics of aging were found to depend on the ketone–ether ratio as well as the substitution pattern of the polymers. The maximum enthalpy lost at equilibrium, Δ H∞, was found to be a linear function of the change in heat capacity at Tg, Δ Cp(Tg), and the degree of supercooling, Δ T. A composite curve incorporating Tg values from physical aging and dynamic mechanical studies, covering 15 decades, could be fitted to the Volger–Fulcher equation and demonstrated that physical aging is an extension of the glass forming process.

scholarly journals The influence of carbon nanotube buckypaper/poly (ether imide) mats on the thermal properties of poly (ether imide) and poly (aryl ether ketone)/carbon fiber laminates

2021 ◽  
Vol 116 ◽  
pp. 108421
Author(s):  
Luis Felipe de Paula Santos ◽  
René Alderliesten ◽  
Winand Kok ◽  
Bruno Ribeiro ◽  
Juliana Bovi de Oliveira ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Carbon Nanotube ◽  
Carbon Fiber ◽  
Aryl Ether ◽  
Aryl Ether Ketone ◽  
Ether Ketone

Synthesis and Characterization of Multi-Sulfonated Poly(Aryl Ether Ketone)s Proton Exchange Membranes

2007 ◽  
Vol 544-545 ◽  
pp. 1065-1068 ◽  
Author(s):  
Dong Hoon Lee ◽  
Hye Suk Park ◽  
Dong Wan Seo ◽  
Tae Whan Hong ◽  
Whan Gi Kim
Keyword(s):  
Ion Exchange ◽  
Exchange Capacity ◽  
Proton Exchange ◽  
Condensation Polymerization ◽  
Aryl Ether ◽  
Scanning Calorimetry ◽  
Ion Exchange Capacity ◽  
Aryl Ether Ketone ◽  
Ether Ketone ◽  
Sulfonated Poly

A series of sulfonated poly(aryl ether ketone)s were prepared by condensation polymerization with bisphenol A and 1,2-bis(4-fluorobenzoyl)-3,6-diphenylbenzene, and followed by sufonation with chlorosulfonic acid. The polymers were characterized by Fourier transform infra-red (FTIR) and ion exchange capacity (IEC) to verify sulfonation. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were carried out to investigate the thermal stability of the prepared membranes. The membranes were found to possess all the requisite properties; Ion exchange capacity (3.31meq./g), glass transition temperatures (207-230°C), and low affinity towards methanol (2.04x10-6-4.15x10-7 cm2/S).

Mild and in situ photo-crosslinking of anthracene-functionalized poly (aryl ether ketone) for enhancing temporal stability of organic NLO materials

2021 ◽  
Vol 56 (9) ◽  
pp. 5910-5923
Author(s):  
Yanxin Tian ◽  
Yulin He ◽  
Pan Liu ◽  
Hui Zhang ◽  
Qiuying Zheng ◽  
...  
Keyword(s):  
Temporal Stability ◽  
Aryl Ether ◽  
Nlo Materials ◽  
Aryl Ether Ketone ◽  
Ether Ketone

scholarly journals Bonding and Thermal Cycling Performances of Two (Poly)Aryl–Ether–Ketone (PAEKs) Materials to an Acrylic Denture Base Resin

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 543 ◽  
Author(s):  
Tzu-Yu Peng ◽  
Saiji Shimoe ◽  
Lih-Jyh Fuh ◽  
Chung-Kwei Lin ◽  
Dan-Jae Lin ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Thermal Cycling ◽  
Fatigue Testing ◽  
Lower Surface ◽  
Aryl Ether ◽  
Bonding Performance ◽  
Significant Difference ◽  
Aryl Ether Ketone ◽  
Ether Ketone ◽  
Thermal Cycling Fatigue

Poly(aryl–ether–ketone) materials (PAEKs) are gaining interest in everyday dental practices because of their natural properties. This study aims to analyze the bonding performance of PAEKs to a denture acrylic. Testing materials were pretreated by grinding, sandblasting, and priming prior to polymerization with the denture acrylic. The surface morphologies were observed using a scanning electron microscope and the surface roughness was measured using atomic force microscopy. The shear bond strength (SBS) values were determined after 0 and 2500 thermal cycles. The obtained data were analyzed using a paired samples t-test and Tukey’s honestly significant difference (HSD) test (α = 0.05). The surface characteristics of testing materials after different surface pretreatments showed obvious differences. PAEKs showed lower surface roughness values (0.02–0.03 MPa) than Co-Cr (0.16 MPa) and zirconia (0.22 MPa) after priming and sandblasting treatments (p < 0.05). The SBS values of PAEKs (7.60–8.38 MPa) met the clinical requirements suggested by ISO 10477 (5 MPa). Moreover, PAEKs showed significantly lower SBS reductions (p < 0.05) after thermal cycling fatigue testing compared to Co-Cr and zirconia. Bonding performance is essential for denture materials, and our results demonstrated that PAEKs possess good resistance to thermal cycling fatigue, which is an advantage in clinical applications. The results imply that PAEKs are potential alternative materials for the removable of prosthetic frameworks.

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