scholarly journals Chiral Self‐Sorting of Diformylated N ‐Hetero‐ ortho ‐phenylene Hexamers by Macrocyclization with Aromatic Diamines

2021 ◽  
Author(s):  
Yoshihiro Hamada ◽  
Yuichiro Tokoro ◽  
Toshiyuki Oyama
Keyword(s):  
Aromatic Diamines

Benzoxazine monomers based on aromatic diamines and investigation of their polymerization by rheological and thermal methods

2020 ◽  
Vol 138 (10) ◽  
pp. 49974
Author(s):  
Igor A. Sarychev ◽  
Vyacheslav V. Kireev ◽  
Vladimir V. Khmelnitskiy ◽  
Viktoria V. Vorobyeva ◽  
Anton S. Tupikov ◽  
...  
Keyword(s):  
Aromatic Diamines ◽  
Thermal Methods

scholarly journals Synthesis and Characterization of Partially Renewable Oleic Acid-Based Ionomers for Proton Exchange Membranes

Polymers ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 130
Author(s):  
Carlos Corona-García ◽  
Alejandro Onchi ◽  
Arlette A. Santiago ◽  
Araceli Martínez ◽  
Daniella Esperanza Pacheco-Catalán ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Proton Conductivity ◽  
Electrochemical Impedance ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Molar Ratio ◽  
Aromatic Diamines ◽  
Chemical Structures ◽  
Long Chain

The future availability of synthetic polymers is compromised due to the continuous depletion of fossil reserves; thus, the quest for sustainable and eco-friendly specialty polymers is of the utmost importance to ensure our lifestyle. In this regard, this study reports on the use of oleic acid as a renewable source to develop new ionomers intended for proton exchange membranes. Firstly, the cross-metathesis of oleic acid was conducted to yield a renewable and unsaturated long-chain aliphatic dicarboxylic acid, which was further subjected to polycondensation reactions with two aromatic diamines, 4,4′-(hexafluoroisopropylidene)bis(p-phenyleneoxy)dianiline and 4,4′-diamino-2,2′-stilbenedisulfonic acid, as comonomers for the synthesis of a series of partially renewable aromatic-aliphatic polyamides with an increasing degree of sulfonation (DS). The polymer chemical structures were confirmed by Fourier transform infrared (FTIR) and nuclear magnetic resonance (1H, 13C, and 19F NMR) spectroscopy, which revealed that the DS was effectively tailored by adjusting the feed molar ratio of the diamines. Next, we performed a study involving the ion exchange capacity, the water uptake, and the proton conductivity in membranes prepared from these partially renewable long-chain polyamides, along with a thorough characterization of the thermomechanical and physical properties. The highest value of the proton conductivity determined by electrochemical impedance spectroscopy (EIS) was found to be 1.55 mS cm−1 at 30 °C after activation of the polymer membrane.

Nickel-catalysed dehydrogenative coupling of aromatic diamines with alcohols: selective synthesis of substituted benzimidazoles and quinoxalines

2019 ◽  
Vol 55 (42) ◽  
pp. 5958-5961 ◽  
Author(s):  
Atanu Bera ◽  
Motahar Sk ◽  
Khushboo Singh ◽  
Debasis Banerjee
Keyword(s):  
Hydrogen Gas ◽  
Selective Synthesis ◽  
Primary Alcohols ◽  
Aromatic Diamines ◽  
Dehydrogenative Coupling

The nickel-catalysed dehydrogenative coupling of 1,2-di-amino-benzene with primary alcohols and diols for the synthesis of N-heterocycles is reported. The catalytic protocol enables the transformation in up to 91% yield and generates water and hydrogen gas as byproducts.

Thermally stable polyimide binders from aromatic dianhydrides and acetyl derivatives of aromatic diamines: Formation mechanism

1997 ◽  
Vol 37 (8) ◽  
pp. 1381-1386 ◽  
Author(s):  
M. Ya. Goykhman ◽  
V. M. Svetlichnyi ◽  
V. V. Kudriavtsev ◽  
N. G. Antonov ◽  
Yu. N. Panov ◽  
...  
Keyword(s):  
Formation Mechanism ◽  
Thermally Stable ◽  
Aromatic Diamines ◽  
Derivatives Of
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