Sulfonated poly(aryl ether ketone) random copolymers having crosslinking structure for proton exchange membrane of fuel cell

ABSTRACT We have succeeded in developing a new methodology for proton exchange membrane (PEM) of direct methanol fuel cell (DMFC), which stemmed formation of a crosslinking structure by UV

irradiation to sulfonated poly (aryl ether ketone) (PAEK) copolymer. A new class of the aromatic PAEKs with pendant sulfonate groups and methyl groups have been prepared by a direct aromatic

nucleophilic substitution polycondensation reaction of 3,3′-disulfonated-4,4′-difluorobenzophenone (DSDFBP), 4,4′-difluorobenzophenone (DFBP) and the biphenols that have methyl groups. The

polymerization quantitatively proceeded to form a high intrinsic viscosity of copolymer. Membranes having high mechanical strength were successfully obtained from the copolymers of DSDFBP,

DFBP and the biphenols that have methyl groups including tetramethyl bisphenol A (TMBPA), tetramethyl bisphenol F (TMBPF) and tetramethyl biphenol (TMBP). The ketone of benzophenone group

and the methyl group in the repeating structure unit of these PAEKs were easily crosslinked by UV irradiation and induced a crosslinked structure that improved their methanol blocking

properties drastically. The membrane of crosslinking copolymer, DSDFBP/DFBP/TMBPF = 5/5/10 mole ratio (F1), was stable at 240 °C in air and showed the high proton conductivity at 90 °C of

0.23 S/cm and the low methanol permeation rate at 25 °C of 5.5 μmol/cm2/min. This proton conductivity and methanol permeability are comparable to and half of the values of fluorinated

copolymer Nafion112® that is known as the representative material of a PEM of DMFC respectively. These new copolymers, which have proton conductive sites and crosslinking structures, are

candidates as new polymeric electrolyte materials for proton exchange membrane fuel cells, especially for DMFCs. SIMILAR CONTENT BEING VIEWED BY OTHERS HIGHLY CONDUCTIVE ANION EXCHANGE

MEMBRANES BASED ON POLYMER NETWORKS CONTAINING IMIDAZOLIUM FUNCTIONALISED SIDE CHAINS Article Open access 12 February 2021 NOVEL PROTON CONDUCTING CORE–SHELL PAMPS-PVBS@FE2TIO5 NANOPARTICLES

AS A REINFORCEMENT FOR SPEEK BASED MEMBRANES Article Open access 01 March 2021 FUEL CELL PERFORMANCE IMPROVEMENT VIA THE STERIC EFFECT OF A HYDROCARBON-BASED BINDER FOR CATHODE IN PROTON

EXCHANGE MEMBRANE FUEL CELLS Article Open access 17 August 2022 ARTICLE PDF REFERENCES * T. Yamaguchi, F. Miyata, and S. Nakao, _J. Membr. Sci._, 214, 283 (2003). * S. S. Yen, US Patent 18

823 (1996). * L. E. Karlsson and P. Jannasch, _J. Membr. Sci._, 230, 61 (2004). * M. Yoshida, JP Patent 2005-336338 (2005). * J. P. Quentin, US Patent 3 709 841 (1973). * J. B. Baradie, C.

Poinsignon, J. Y. Sanchez, J. Piffard, G. Vitter, N. Bastaoui, D. Forcallo, A. Denoyelle, D. Delabouglise, and M. Vaujany, _J. Power Sources_, 74, 8 (1998). * C. Bailly, D. J. Williams, F.

E. Karasz, and W. J. MacKnight, _Polymer_, 28, 1009 (1987). * M. T. Bishop, F. Karasz, P. S. Russo, and K. H. Langley, _Macromolecules_, 18, 86 (1985). * A. Noshay and L. M. Robeson, _J.

Appl. Polym. Sci._, 20, 1885 (1976). * F. Wang, T. Chen, and J. Xu, _Macromol. Chem. Phys._, 199, 1421 (1998). * K. Goto, J. Kamada, J. Kida, and S. Tamai, _J. Photopolym. Sci. Technol._,

17, 215 (2004). * X. Guo, J. Fang, T. Watari, K. Tanaka, H. Kita, and K. Okamoto, _Macromolecules_, 35, 6707 (2002). Download references AUTHOR INFORMATION AUTHORS AND AFFILIATIONS *

Material Science Laboratory, Mitsui Chemicals Inc., 580-32 Nagaura, Sodegaura, 299-0265, Japan Satoko Fujiyama, Junichi Ishikawa, Takehiko Omi & Shoji Tamai Authors * Satoko Fujiyama

View author publications You can also search for this author inPubMed Google Scholar * Junichi Ishikawa View author publications You can also search for this author inPubMed Google Scholar *

Takehiko Omi View author publications You can also search for this author inPubMed Google Scholar * Shoji Tamai View author publications You can also search for this author inPubMed Google

Scholar CORRESPONDING AUTHOR Correspondence to Satoko Fujiyama. RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Fujiyama, S., Ishikawa, J., Omi, T. _et

al._ Sulfonated Poly(aryl ether ketone) Random Copolymers Having Crosslinking Structure for Proton Exchange Membrane of Fuel Cell. _Polym J_ 40, 17–24 (2008).

https://doi.org/10.1295/polymj.PJ2006251 Download citation * Received: 01 March 2007 * Accepted: 22 September 2007 * Published: 13 November 2007 * Issue Date: 01 January 2008 * DOI:

https://doi.org/10.1295/polymj.PJ2006251 SHARE THIS ARTICLE Anyone you share the following link with will be able to read this content: Get shareable link Sorry, a shareable link is not

currently available for this article. Copy to clipboard Provided by the Springer Nature SharedIt content-sharing initiative KEYWORDS * Sulfonated Poly(aryl ether ketone) * Crosslink * Proton

Exchange Membrane * Fuel Cell