Polycondensation reaction ofN,N′-(4,4′-oxydiphthaloyl)-bis-L-methionine diacid chloride with aromatic diamines: Synthesis and properties

2005 ◽  
Vol 99 (3) ◽  
pp. 1038-1044 ◽  
Author(s):  
Shadpour Mallakpour ◽  
Elaheh Kowsari
Keyword(s):  
Polycondensation Reaction ◽  
Aromatic Diamines ◽  
Diacid Chloride

Sulfonated aromatic copoly(ether–amide) membranes II

2017 ◽  
Vol 30 (4) ◽  
pp. 437-445 ◽  
Author(s):  
Wadi Elim Sosa-González ◽  
Ramón del Jesús Palí-Casanova ◽  
Yamile Pérez-Padilla ◽  
María Isabel Loría-Bastarrachea ◽  
José Luis Santiago-García ◽  
...  
Keyword(s):  
Proton Conductivity ◽  
Sulfonic Acid ◽  
Main Chain ◽  
Exchange Capacity ◽  
Proton Nuclear Magnetic Resonance ◽  
Polycondensation Reaction ◽  
Aromatic Diamines ◽  
Ion Exchange Capacity ◽  
Sulfonation Degree ◽  
Sulfonic Acid Groups

Several aromatic sulfonated copoly(ether–amide)s, based on the aromatic diamines 4,4′-(hexafluoroisopropylidene)bis(p-phenyleneoxy)-dianiline (HFD) and 2,4-diaminobenzensulfonic acid (DABS) and 4,4′-oxybis(benzoic acid) (OBA), were synthesized through a polycondensation reaction. The sulfonation degree was controlled by introducing different concentrations of 2,4-DABS from 40 mol% up to 80 mol%. Proton nuclear magnetic resonance validated the expected concentrations of sulfonic acid groups in the sulfonated aromatic copoly(ether–amide)s. Thermal decomposition of sulfonic groups was found to initiate at 280°C, while main chain decomposition initiates at 410°C. Proton conductivity between 30°C and 75°C was 19.0 and 45.0 mS/cm, respectively, for the copolymer with the highest concentration of sulfonic groups (–SO3H). Comparison with structurally similar sulfonated copolyamides and copoly(ether–amide)s indicates that these new sulfonated copoly(ether–amide)s based on 4,4′-OBA show improved mechanical properties, but a decrease in ion exchange capacity and proton conductivity.

Fluorinated Poly(Phenylquinoxaline–Imide–Amide)S

1996 ◽  
Vol 8 (3) ◽  
pp. 445-453 ◽  
Author(s):  
C Hamciuc ◽  
E Hamciuc ◽  
F W Mercer ◽  
N M Belomoina ◽  
M Bruma
Keyword(s):  
Glass Transition ◽  
Transition Temperatures ◽  
Aromatic Diamines ◽  
Polar Solvents ◽  
Glass Transition Temperatures ◽  
Flexible Films ◽  
Diacid Chloride ◽  
Methyl Pyrrolidone ◽  
Solution Polycondensation

Poly(phenylquinoxaline–imide–amide)s have been synthesized by solution polycondensation of aromatic diamines containing preformed phenylquinoxaline rings with a diacid chloride incorporating preformed imide rings and hexafluoroisopropylidene (6F) groups. These polymers do not decompose up to 400 °C and have glass transition temperatures in the range of 284–308 °C. They are soluble in polar amidic solvents, such as N-methyl-pyrrolidone, and in less polar solvents such as pyridine and tetrahydrofuran, and give flexible films by casting from solutions.

New Silicon-Containing Poly(Imide-Amide)s

2003 ◽  
Vol 15 (3) ◽  
pp. 347-359 ◽  
Author(s):  
Elena Hamciuc ◽  
Maria Bruma ◽  
Burkhard Schulz ◽  
Thomas Köpnick
Keyword(s):  
Decomposition Temperature ◽  
Thin Polymer Films ◽  
Aromatic Diamines ◽  
Initial Decomposition Temperature ◽  
Force Microscopy ◽  
Flexible Films ◽  
Atomic Force ◽  
Thin Polymer ◽  
Diacid Chloride ◽  
Poly Imide

New aromatic silicon-containing poly(imide-amide)s have been synthesized by solution polycondensation of various aromatic diamines having ether bridges between phenylene rings with a diacid chloride containing silicon. These polymers are easily soluble in polar amidic solvents such as N-methyl-pyrrolidinone or dimethylformamide and can be cast into thin flexible films or coatings from such solutions. They show high thermal stability, with an initial decomposition temperature above 410°C and a glass transition temperature in the range of 251-285°C. Very thin polymer films deposited by the spincoating technique onto silicon wafers showed a smooth, pinhole-free surface in atomic force microscopy investigations.

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