Journal ArticleDOI
Novel sulfonated polyimides as polyelectrolytes for fuel cell application. 2. Synthesis and proton conductivity of polyimides from 9,9-bis(4-aminophenyl)fluorene-2,7-disulfonic acid
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TLDR
In this paper, a new sulfonated diamine monomer, 9,9-bis(4-aminophenyl)fluorene-2,7-disulfonic acid (BAPFDS), was synthesized by direct sulfonation of the parent diamine using fuming sulfuric acid as the sulfonating reagent.Abstract:
A new sulfonated diamine monomer, 9,9-bis(4-aminophenyl)fluorene-2,7-disulfonic acid (BAPFDS), was synthesized by direct sulfonation of the parent diamine, 9,9-bis(4-aminophenyl)fluorene (BAPF), using fuming sulfuric acid as the sulfonating reagent. A series of sulfonated polyimides with different sulfonation degrees were prepared from 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA), BAPFDS, and common nonsulfonated diamines. The resulting sulfonated polyimides generally showed good solubility in m-cresol and DMSO. Proton conductivities of these polyimide membranes were measured as the functions of relative humidity and temperature. The resulting homopolyimide, NTDA-BAPFDS, displayed proton conductivities quite similar to those of Nafion 117 in the whole humidity range (RH < 100%). At 100% relative humidity, all the BAPFDS-based polyimide membranes showed proton conductivities similar to or higher than those of Nafion 117. In addition, BAPFDS-based polyimide membranes exhibited much better water sta...read more
Citations
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Journal ArticleDOI
Scientific aspects of polymer electrolyte fuel cell durability and degradation.
Rodney L. Borup,Jeremy P. Meyers,Bryan S. Pivovar,Yu Seung Kim,Rangachary Mukundan,Nancy Garland,Deborah J. Myers,Mahlon S. Wilson,Fernando H. Garzon,David L. Wood,Piotr Zelenay,Karren L. More,Ken Stroh,Thomas A. Zawodzinski,James M. Boncella,James E. McGrath,Minoru Inaba,Kenji Miyatake,Michio Hori,Kenchiro Ota,Zempachi Ogumi,Seizo Miyata,Atsushi Nishikata,Zyun Siroma,Yoshiharu Uchimoto,Kazuaki Yasuda,Ken'ichi Kimijima,Norio Iwashita +27 more
TL;DR: The research focuses on the durability of polymer electrolyte fuel cells (PEFCs), in particular, membrane degradation, and he has been involved in NEDO R&D research projects on PEFC durability since 2001.
Journal ArticleDOI
Alternative Polymer Systems for Proton Exchange Membranes (PEMs)
TL;DR: Devising systems that can conduct protons with little or no water is perhaps the greatest challenge for new membrane materials, and new membranes that have significantly reduced methanol permeability and water transport (through diffusion and electro-osmotic drag) are required for automotive applications.
Journal ArticleDOI
Approaches and Recent Development of Polymer Electrolyte Membranes for Fuel Cells Operating above 100 °C
TL;DR: In this article, a review of the area encompassing modified PFSA membranes, alternative sulfonated polymer and their composite membranes, and acid−base complex membranes is presented. But the authors do not discuss the performance of the composite membranes.
Journal ArticleDOI
Advanced polyimide materials: Syntheses, physical properties and applications
TL;DR: Polyimides rank among the most heat-resistant polymers and are widely used in high temperature plastics, adhesives, dielectrics, photoresists, nonlinear optical materials, membrane materials for separation, and Langmuir-Blodgett (LB) films, among others as mentioned in this paper.
Journal ArticleDOI
Solid polymer electrolyte membranes for fuel cell applications¿a review
TL;DR: In this paper, the performance of polymer electrolyte membrane fuel cells (PEMFCs) has been evaluated in the context of fuel cell systems, considering their structure-property relationship.
References
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Journal ArticleDOI
Proton Conductivity of Nafion 117 as Measured by a Four‐Electrode AC Impedance Method
TL;DR: In this article, the proton conductivity of Nafion 117 was measured under various conditions of humidity and temperature using a four-electrode ac impedance method, and it varied strongly with the humidity and heat-treatment of the membrane.
Journal ArticleDOI
Soluble sulfonated naphthalenic polyimides as materials for proton exchange membranes
TL;DR: In this article, a series of sequenced sulfonated naphthalenic polyimides with improved solubility were prepared by polycondensation in m-cresol using aromatic diamines containing phenylether bonds and/or bulky groups.
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Partially sulfonated poly(arylene ether sulfone) : a versatile proton conducting membrane material for modern energy conversion technologies
TL;DR: In this article, a versatile in-situ crosslinking technique was developed to crosslink the sulfonated poly (arylene ether sulfone) electrolytes during membrane processing in order to substantially reduce water swelling without impairing other membrane properties such as proton conductivity.
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Evaluation of a Sol-Gel Derived Nafion/Silica Hybrid Membrane for Proton Electrolyte Membrane Fuel Cell Applications: I. Proton Conductivity and Water Content
TL;DR: In this paper, Sol-gel derived Nafion®/silica hybrid membranes were investigated as a potential polymer electrolyte for fuel cell applications and their proton conductivity and water content were measured as a function of temperature, water vapor activity, and silica content.
Journal ArticleDOI
The sodium salts of sulphonated poly(aryl-ether-ether-ketone) (PEEK): Preparation and characterization
TL;DR: In this article, two complementary methods were developed to produce sulphonated poly(oxy-1,4-phenylene-oxy- 1, 4, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 18, 19, 20, 21, 22, 23, 24, 25, 30, 34, 35, 36, 38, 39, 40, 41, 46, 49, 50, 51, 56, 57, 58, 60, 61, 62, 63, 64, 70, 66, 67, 69,