scholarly journals States of water in proton exchange membranes: Part A - Influence of chemical structure and composition

Polymer ◽  
2017 ◽  
Vol 111 ◽  
pp. 297-306 ◽  
Author(s):  
Abhishek Roy ◽  
Michael A. Hickner ◽  
Hae-Seung Lee ◽  
Tom Glass ◽  
Mou Paul ◽  
...  
Keyword(s):  
Chemical Structure ◽  
Proton Exchange Membranes ◽  
Proton Exchange

scholarly journals Effect of Chemical Structure and Degree of Branching on the Stability of Proton Exchange Membranes Based on Sulfonated Polynaphthylimides

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 652
Author(s):  
Chunmei Gao ◽  
Jiale Chen ◽  
Boping Zhang ◽  
Lei Wang
Keyword(s):  
Oxidative Stability ◽  
Chemical Structure ◽  
Hydrolytic Stability ◽  
Oxidation Stability ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Ether Linkage ◽  
Degree Of Branching ◽  
The Core ◽  
The Stability

Hydrolytic stability and oxidative stability are the core properties of sulfonated polynaphthylimides (SPIs) as proton exchange membranes. The chemical structure of SPIs directly influences the performance. Herein, three different series of branched SPIs were designed and prepared using 1,3,5-tris (2-trifluoromethyl-4-aminophenoxy) benzene as a trifunctional monomer and three non-sulfonated diamine monomers, such as 4,4′-oxydianiline (ODA), 2,2-bis[4-(4-aminophenoxy)phenyl]hexafluoropropane (6FODA), and 4,4′-(9-fluorenylidene)dianiline (BFDA). The effect of the chemical structure and degree of branching on SPIs properties is discussed. The results showed that by controlling the chemical structure and degree of branching, the chemical stability of SPIs changed significantly. SPI-6FODA with two ether linkages and a hydrophobic CF3 group has higher hydrolytic stability than SPI-ODA with only one ether linkage. In addition, with the increase of the introduced B3 monomer, the oxidation stability of SPI-6FODA has been greatly improved. We successfully synthesized SPIs with a high hydrolytic stability and oxidative stability.

Polymers application in proton exchange membranes for fuel cells (PEMFCs)

2017 ◽  
Vol 2 (8) ◽  
Author(s):  
Justyna Walkowiak-Kulikowska ◽  
Joanna Wolska ◽  
Henryk Koroniak
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Chemical Structure ◽  
Polymer Membranes ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Synthetic Methods ◽  
Current Status ◽  
Important Research ◽  
Ionic Groups

Abstract This review presents the most important research on alternative polymer membranes with ionic groups attached, provides examples of materials with a well-defined chemical structure that are described in the literature. Furthermore, it elaborates on the synthetic methods used for preparing PEMs, the current status of fuel cell technology and its application. It also briefly discusses the development of the PEMFC market.

New sulfonated poly(arylene ether sulfone) copolymers containing phenyl side chains as proton exchange membranes

2016 ◽  
Vol 40 (4) ◽  
pp. 3755-3762 ◽  
Author(s):  
RiMing Chen ◽  
Guang Li
Keyword(s):  
Chemical Structure ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Side Chains ◽  
Arylene Ether ◽  
Phase Images ◽  
Sulfonated Poly

The chemical structure and phase images of the SPAES-PQ-40 membrane.

Methods for modifying proton exchange membranes using the sol–gel process

Polymer ◽  
2005 ◽  
Vol 46 (12) ◽  
pp. 4504-4509 ◽  
Author(s):  
L.C. Klein ◽  
Y. Daiko ◽  
M. Aparicio ◽  
F. Damay
Keyword(s):  
Sol Gel ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Sol Gel Process

Crosslinked Proton Exchange Membranes with a Wider Working Temperature Based on Phosphonic Acid Functionalized Siloxane and PPO

2021 ◽  
Vol 29 (3) ◽  
pp. 199-210
Author(s):  
Zhihui Wu ◽  
Chunhui Shen ◽  
Shanjun Gao ◽  
Xi Zhu ◽  
Mingliang Zhang ◽  
...  
Keyword(s):  
Phosphonic Acid ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Working Temperature

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.

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