Journal ArticleDOI
New Fluorinated Polymers Bearing Pendant Phosphonic Acid Groups. Proton Conducting Membranes for Fuel Cell
Reads0
Chats0
TLDR
In this paper, the synthesis and characterizations of original fluorinated copolymers bearing phosphonic acid side functions for novel membranes potentially involved in fuel cell applications are presented, which are obtained by chemical modifications of various poly(CTFE-alt-IEVE) and poly[CTFE]-co-(CT FE-EVE)] terpolymers via the Arbuzov reaction.Abstract:
The synthesis and characterizations of original fluorinated copolymers bearing phosphonic acid side functions for novel membranes potentially involved in fuel cell applications are presented. These copolymers were obtained by chemical modifications of various poly(CTFE-alt-IEVE) and poly[(CTFE-alt-IEVE)-co-(CTFE-EVE)] terpolymers (where CTFE, IEVE, and EVE stand for chlorotrifluoroethylene, 2-iodoethyl vinyl ether, and ethyl vinyl ether) via the Arbuzov reaction. Then, the hydrolysis of the phosphonate moieties into phosphonic acid groups was carried out quantitatively in mild conditions, in the presence of bromotrimethylsilane. The ionic exchange capacities (IECs) determined by potentiometric titration were ranging from 2.9 to 6.8 mequiv/g. The thermal and electrochemical properties of the resulting membranes (processed by casting) were investigated. Whatever the phosphonic acid content, the main degradation started from 250 °C, showing a high thermo-oxidative stability of these copolymers. At 25 °C and ...read more
Citations
More filters
Journal ArticleDOI
Advances in the high performance polymer electrolyte membranes for fuel cells.
Hongwei Zhang,Pei Kang Shen +1 more
TL;DR: This critical review tersely and concisely reviews the recent development of the polymer electrolyte membranes and the relationship between their properties and affecting factors like operation temperature.
Journal ArticleDOI
(Co)polymers of Chlorotrifluoroethylene: Synthesis, Properties, and Applications
Frédéric Boschet,Bruno Ameduri +1 more
TL;DR: This review extensively reports the synthesis, properties and applications of the copolymers based on CTFE with non-halogenated, fluorinated, commercially available or synthesized comonomer and proposes a reactivity series of these M comonomers with respect to a macroradical terminated by C TFE.
Patent
Methods and devices for the production of Hydrocarbons from Carbon and Hydrogen sources
Craig D. Eastman,Douglas R. Hole +1 more
TL;DR: In this paper, devices and methods are described for converting a carbon source and a hydrogen source into hydrocarbons, such as alcohols, for alternative energy sources. But they do not discuss the use of ultrasonic energy to drive the reaction.
Journal ArticleDOI
Cross-Linked Benzoxazine–Benzimidazole Copolymer Electrolyte Membranes for Fuel Cells at Elevated Temperature
TL;DR: In this article, a H3PO4-doped cross-linked benzoxazine-benzimidazole copolymer was proposed for use in proton-exchange membrane fuel cells at elevated temperatures (>100 °C.
Journal ArticleDOI
Recent Developments in Sulfur-Containing Polymers
TL;DR: Sulfur-containing polymers fall under various classes and cover an extremely broad property range as discussed by the authors, and a lot of research efforts have been directed toward exploiting the special high-performance characteristics of polymers with sulfur in the backbone.
References
More filters
Journal ArticleDOI
Non-Fluorinated Polymer Materials for Proton Exchange Membrane Fuel Cells
Jacques Rozière,Deborah J. Jones +1 more
TL;DR: In this article, the authors provide an overview of progress made in the development of proton-conducting hydrocarbon and heterocyclic-based polymers for direct methanol fuel cells and describe the various approaches made to polymer modification/synthesis and salient properties of the materials formed.
Journal ArticleDOI
Functional fluoropolymers for fuel cell membranes
Renaud Souzy,Bruno Ameduri +1 more
TL;DR: In this article, various routes to synthesize functional fluoropolymers used in membranes for fuel cell applications are presented, which can be separated into three main families of alternatives: direct radical copolymerization of fluoroalkenes with fluorinated functional monomers, chemical modification of hydrogenated polymers (e.g. polyparaphenylenes), and grafting of FP-g-poly(M) graft copolymers where FP and M stand for fluoropolymer and monomer, respectively.
Journal ArticleDOI
Intermediate temperature proton conductors for PEM fuel cells based on phosphonic acid as protogenic group: A progress report
Hanna Steininger,M. Schuster,Klaus-Dieter Kreuer,Anke Kaltbeitzel,Bahar Bingöl,Wolfgang H. Meyer,Siri Schauff,Gunther Brunklaus,Joachim Maier,Hans Wolfgang Spiess +9 more
TL;DR: The results clearly indicate that the "spacer concept", which had been proven successful in the optimization of the proton conductivity of heterocycle based systems, fails and a very high concentration of phosphonic acid functional groups forming "bulky" hydrogen bonded aggregates is suggested to be essential for obtaining very high proton Conductivity.
Related Papers (5)
Polysulfones grafted with poly(vinylphosphonic acid) for highly proton conducting fuel cell membranes in the hydrated and nominally dry state
Julien Parvole,Patric Jannasch +1 more