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.

Crystallization kinetics of novel poly(aryl ether ketone) copolymers containing 2,7-naphthalene moieties

2006 ◽  
Vol 102 (3) ◽  
pp. 2527-2536 ◽  
Author(s):  
Si-Jie Liu ◽  
Xiao-Bo Sun ◽  
Xiang Hou ◽  
Gui-Bin Wang ◽  
Zhen-Hua Jiang
Keyword(s):  
Crystallization Kinetics ◽  
Aryl Ether ◽  
Aryl Ether Ketone ◽  
Ether Ketone ◽  
Kinetics Of

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.

Nonisothermal melt and cold crystallization kinetics of poly(aryl ether ketone ether ketone ketone)

2000 ◽  
Vol 77 (13) ◽  
pp. 2865-2871 ◽  
Author(s):  
Zhaobin Qiu ◽  
Zhishen Mo ◽  
Yingning Yu ◽  
Hongfang Zhang ◽  
Shouri Sheng ◽  
...  
Keyword(s):  
Crystallization Kinetics ◽  
Cold Crystallization ◽  
Aryl Ether ◽  
Aryl Ether Ketone ◽  
Ether Ketone ◽  
Kinetics Of

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°.

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