Polyconjugated Linear and Cardo Oligomers Based on Aromatic Diamines and Their Thermal Properties

2015 ◽  
pp. 269-276
Keyword(s):  
Thermal Properties ◽  
Aromatic Diamines

Dielectric and thermal characterization of fluorinated polyimides containing heterocyclic moieties

1993 ◽  
Vol 5 (2) ◽  
pp. 97-106 ◽  
Author(s):  
Frank W Mercer ◽  
Martin T McKenzie
Keyword(s):  
Thermal Stability ◽  
Dielectric Constant ◽  
Thermal Properties ◽  
Relative Humidity ◽  
Thermal Characterization ◽  
Dielectric Constants ◽  
Aromatic Diamines ◽  
Fluorinated Polyimides

A series of fluorinated polyinides and fluorinated polyimides containing heterocyclic moieties were prepared and investigated to determine their dielectric constants, dielectric constants as a function of relative humidity (RH) and thermal properties. Thle fluorinated polyimides containing heterocyclic moieties were prepared from diamines containing pyridine, pyridazine, oxadiazole or benzoxazole moieties. The properties of the fluorinated heterocyclic-containing polyimides were compared with those of fluorinated polyimides prepared from aromatic diamines. In most cases, the introduction of heterocyclic moieties caused an increase in dielectric constant, an increase in the dielectric constant as a function of relative humidity and a decrease in thermal stability compared with the polyimides prepared with aromatic diamines.

scholarly journals Towards High-performance Materials Based on Carbohydrate-Derived Polyamide Blends

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 413 ◽  
Author(s):  
Aleksandra Wróblewska ◽  
Nils Leoné ◽  
Stefaan De Wildeman ◽  
Katrien Bernaerts
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Acid Ester ◽  
High Performance ◽  
Melt Blending ◽  
Aromatic Diamines ◽  
Biobased Materials ◽  
Dodecanedioic Acid ◽  
Thermal Stability Of ◽  
Aliphatic Polyamide

A bio-derived monomer called 2,3:4,5-di-O-isopropylidene-galactarate acid/ester (GalXMe) has great potential in polymer production. The unique properties of this molecule, such as its rigidity and bulkiness, contribute to the good thermal properties and appealing transparency of the material. The main problem, however, is that like other biobased materials, the polymers derived thereof are very brittle. In this study, we report on the melt blending of GalXMe polyamides (PAs) with different commercial PA grades using extrusion as well as blend characterization. Biobased PA blends showed limited to no miscibility with other polyamides. However, their incorporation resulted in strong materials with high Young moduli. The increase in modulus of the prepared GalXMe blends with commercial PAs ranged from up to 75% for blends with aliphatic polyamide composed of 1,6-diaminohexane and 1,12-dodecanedioic acid PA(6,12) to up to 82% for blends with cycloaliphatic polyamide composed of 4,4′-methylenebis(cyclohexylamine) and 1,12-dodecanedioic acid PA(PACM,12). Investigation into the mechanism of blending revealed that for some polyamides a transamidation reaction improved the blend compatibility. The thermal stability of the biobased PAs depended on which diamine was used. Polymers with aliphatic/aromatic or alicyclic diamines showed no degradation, whereas with fully aromatic diamines such as p-phenylenediamine, some degradation processes were observed under extrusion conditions (260/270 °C).

scholarly journals CURING OF DIGLYCIDAL ESTERS OF BISPHENOLS WITH AMINE HARDENERS

World Science ◽  
2021 ◽  
Author(s):  
Givi Papava ◽  
Ketevan Ebralidze ◽  
Eter Gavashelidze ◽  
Marina Gurgenishvili ◽  
Shalva Papava ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Heat Resistance ◽  
Chemical Structure ◽  
High Heat ◽  
Thermal Parameters ◽  
High Heat Resistance ◽  
Aromatic Diamines ◽  
Temperature Range ◽  
Epoxy Polymers

The effect of hardeners on the properties of cured epoxy polymers is studied. For the purpose of synthesis of polymers with increased thermal properties. Theglycide esters of polycyclic bisphenols synthesized by us were used as a diol component. Since the thermal and heat resistance of polymers, in addition to the chemical structure of bisphenols, also depend on the structure of the hardener used, amine hardeners of different chemical structure are used to improve the thermal parameters of polymers, both heat resistance and heat resistance. The influence of the chemical structure of these hardeners on the properties of epoxy polymers is studied. Cured epoxy polymers are characterized by high heat resistance. High heat resistance results are obtained by 4,4′-diaminodiphenylsulfone, benzidine, 4,4′-diaminodiphenyloxide and other aromatic diamines. Polymers obtained by curing with these hardeners are deformed in the temperature range of 220-245°C. The use of the above hardeners gives high results in terms of heat resistance. In all cases, the polymers obtained on the basis of these hardeners decrease in weight by 10% in the temperature range of 340-400°C.

Synthesis and Characterization of Wholly Aromatic Poly (amide-sulfonamide)s by Solution Polycondensation

2013 ◽  
Vol 821-822 ◽  
pp. 949-952
Author(s):  
Li Jian Liu ◽  
Da Zhi Wang ◽  
Tong Kuan Xu ◽  
Lin Jia ◽  
Feng Ding ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Benzoyl Chloride ◽  
Synthesis And Characterization ◽  
Aromatic Diamines ◽  
Chemical Structures ◽  
Solution Polycondensation

Four wholly aromatic Poly (amide-sulfonamide) s (PASAs) were synthesized by the solution polycondensation from m-chlorosulfonyl benzoyl chloride and aromatic diamines in tetramethylene sulfone and substituted 2-Piucoline as the acid acceptor. The chemical structures of PASAs were characterized by FTIR,1HNMR. Thermal properties of PASAs were investigated by TGA.

The thermal properties of some amine tetraphenylboron salts8-Quinolinol and its derivatives

1960 ◽  
Vol 23 ◽  
pp. 332-336 ◽  
Author(s):  
W WENDLANDT ◽  
J VANTASSEL ◽  
G ROBERTHORTON
Keyword(s):  
Thermal Properties

Thermal properties of an erbium-doped fibre amplifier

1990 ◽  
Vol 137 (3) ◽  
pp. 155 ◽  
Author(s):  
C.A. Millar ◽  
T.J. Whitley ◽  
S.C. Fleming
Keyword(s):  
Thermal Properties ◽  
Fibre Amplifier ◽  
Erbium Doped
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