Preparation and characterization of inherently heat-sealable polyimides with high glass transition temperatures

2015 ◽  
Vol 133 (8) ◽  
pp. n/a-n/a ◽  
Author(s):  
Hongjiang Ni ◽  
Jingang Liu ◽  
Shiyong Yang
Keyword(s):  
Glass Transition ◽  
Transition Temperatures ◽  
Glass Transition Temperatures

scholarly journals Synthesis and characterization of semiaromatic polyamides comprising benzofurobenzofuran repeating units

2017 ◽  
Vol 8 (14) ◽  
pp. 2197-2209 ◽  
Author(s):  
Julien Cretenoud ◽  
Bilal Özen ◽  
Thomas Schmaltz ◽  
Daniel Görl ◽  
Alberto Fabrizio ◽  
...  
Keyword(s):  
Glass Transition ◽  
Synthesis And Characterization ◽  
Transition Temperatures ◽  
Glass Transition Temperatures

Extended π-conjugated segments such as benzofurobenzofuran can be included into polyamides with high glass transition temperatures.

Naphthalene-based poly(aryl ether)s. II. Synthesis and characterization of poly(ether ketone)s containing two 1,4-naphthylene moieties in the repeat unit

1997 ◽  
Vol 75 (10) ◽  
pp. 1346-1353 ◽  
Author(s):  
Zhi Yuan Wang ◽  
Peter W. Broughton
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Repeat Unit ◽  
Synthesis And Characterization ◽  
Transition Temperatures ◽  
Aryl Ether ◽  
Glass Transition Temperatures ◽  
Phenyl Sulfone ◽  
Ether Ketone

Two new monomers, 4-chloro-1-(4′-fluoro-1-naphthoyl)naphthalene and 1,4-bis(4′-fluoro-1′-naphthoyl)benzene, have been synthesized and polymerized with four different bisphenols to give two series of the naphthalene-based poly(ether ketone)s that are analogous to commercial PEEK and PEEKK. The effect of the introduction of one or two 1,4-naphthylene moieties, in the backbone of the repeat unit, on the glass transition temperatures has been studied. The glass transition temperatures usually increased by 20–45 °C upon replacing one 1,4-phenylene with one 1,4-naphthylene moiety. All new poly (ether ketone)s prepared in tetramethylene sulfone were amorphous, with the glass transition temperatures in a range of 212–273 °C. The polymer produced from 1,4-bis(4′-fluoro-1′-naphthoyl)benzene and 1,4-hydroquinone in phenyl sulfone as a solvent at 300 °C showed semicrystalline properties with a melting temperature of 310 °C. Keywords: naphthalene, poly(ether ketone)s, synthesis, characterization, glass transition temperature.

Synthesis and characterization of novel cyanofunctionalized poly(aryl ether ketone)s

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Yunhe Zhang ◽  
Dianfu Ren ◽  
Shaowei Guan ◽  
Ying Na ◽  
Guibin Wang ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperatures ◽  
Aryl Ether ◽  
Excellent Thermal Stability ◽  
Glass Transition Temperatures ◽  
Young’S Moduli ◽  
Flexible Films ◽  
Aryl Ether Ketone ◽  
Ether Ketone

AbstractA series of cyanophenyl-substituted poly(aryl ether ketone)s (PAEKs) have been successfully synthesized from two new bisphenol monomers, (3,4- dicyano) phenylhydroquinone and (4-cyano) phenylhydroquinone respectively, and the thermal behaviour and the solubility have been characterized. These polymers exhibited high glass transition temperatures and excellent thermal stability. The glass transition temperatures ranged from 173 to 217 oC, and 5% weight-loss temperatures were above 470 oC. The solubilities of these polymers have been remarkably improved in common organic solvents over PEEK and PEN. Some polymers formed transparent, strong, and flexible films, with tensile strength of 106.5-125.2 MPa, Young’s moduli of 2.68-3.20 GPa, and elongations at break of 9- 16 %.

Synthesis and Characterization of New Photorefractive Polymers with High Glass Transition Temperatures

1998 ◽  
Vol 31 (18) ◽  
pp. 6184-6189 ◽  
Author(s):  
Martin Döbler ◽  
Christoph Weder ◽  
Peter Neuenschwander ◽  
Ulrich W. Suter ◽  
Stéphane Follonier ◽  
...  
Keyword(s):  
Glass Transition ◽  
Synthesis And Characterization ◽  
Transition Temperatures ◽  
Glass Transition Temperatures ◽  
Photorefractive Polymers

scholarly journals Synthesis and Characterization of New Organosoluble and Thermally Stable Poly(thioether-amide)s Bearing Pyridine Subunit in the Main Chain

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Esmael Rostami ◽  
Maryam Bagherzadeh ◽  
Tahereh Alinassab ◽  
Maryam Mohammadpour ◽  
Masume Zangooei ◽  
...  
Keyword(s):  
Weight Loss ◽  
Glass Transition ◽  
Main Chain ◽  
Transition Temperatures ◽  
Thermal Stabilities ◽  
Glass Transition Temperatures ◽  
H Nmr ◽  
Good Solubility ◽  
Amorphous Structures

We report the synthesis of new polyamides containing 2,6-bis(2-thio-2-(4-carboxyphenyl)-1-oxo)pyridine subunit, under microwave irradiation using Yamasaki phosphorylation method. The solubility, thermal behavior, and viscosity of polyamides were evaluated. The structures of polymers have been characterized using IR and 1H NMR spectroscopy. These polyamides showed good solubility, viscosity, high thermal stability, and glass transition temperatures. Their viscosities and glass transition temperatures are in the range of 0.63–0.88 and 223–295°C, respectively. Thermal stabilities for 10% weight loss (T10) are 137–173°C and for 50% weight loss (T50) are in the range of 483–523°C. The study of surface morphology showed particle and amorphous structures.

New Developments in Soluble Thermoplastic High Glass Transition Temperature Polyimides

1992 ◽  
Vol 264 ◽  
Author(s):  
M. E. Rogers ◽  
T. M. Moy ◽  
Y. J. Kim ◽  
J. E. McGrath
Keyword(s):  
Glass Transition ◽  
High Temperature ◽  
Transition Temperatures ◽  
New Developments ◽  
Glass Transition Temperatures ◽  
Transparent Films ◽  
Very High ◽  
End Group ◽  
Temperature Applications

AbstractUtilizing solution imidization, molecular weight and end group control techniques, soluble, fully cyclized polyimides with very high glass transition temperatures have been developed to meet high temperature applications. Mechanistic aspects are investigated for solution imidization by both the polyamic acid route and by the ester-acid route. Polyimides based on pyromellitic dianhydride and a 3F diamine exhibit glass transition temperatures of 420 °C. These polyimides are soluble in polar aprotic solvents and form tough, transparent films which demonstrate mechanical integrity and thermooxidative stability at 700 °F. Various processing routes are explored to demonstrate the viability of these materials in high temperature applications. Details of the synthesis and characterization of these materials will be provided.

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