Japan Atomic Energy Agency

Hitachi, Ltd.

Nitto-Denko Corporation

Hitachi Chemical Company, Ltd.

Kanagawa University

Kabushiki Kaisha Toshiba

Daihatsu Motor Company, Ltd.

Yasunari Maekawa

Masaharu Asano

Masaru Yoshida

Jinhua Chen

Katsumi Kondo

Yozo Nagai

Shin Hasegawa

Yasushi Tomioka

Sukekazu Aratani

Masatoshi Wakagi

Takao Miwa

Yuka Utsumi

Takumi Ueno

Toshimitsu Tachibana

Yoshiaki Okabe

Tetsuya Yamaki

Soji Nishiyama

Hiroshi Koshikawa

Kazuyuki Enomoto

Nobuhiro Kihara

Shinichi Komura

Hirohisa Tanaka

Kenji Sano

Shigeru Matsuyama

Hideyuki Tsuji

Satoru Furuyama

Hiroyuki Kagawa

Yasuyuki Suzuki

Koichiro Asazawa

Arisa Yamada

Junichi Moriyama

Mina Ishida

Akihiro Matsui

Kazuya Yamamoto

Susumu Yamaguchi

Shuichi Takahashi

Geraldine Rames-Langlade

Shigeru Matsuama

Hideyuki Shishitani

Shinichi Sawada

Fumihiro Sanpei

Kimio Yoshimura

Ken-ichi Yoshida

Ikuo Ishibori

Tomohisa Ishizaka

Takahiro Yuyama

Yosuke Yuri

Susumu Okumura

The method of the present disclosure is a method for producing a porous polymer film including: irradiating a strip-shaped polymer film with an ion beam while moving the polymer film transversely to the ion beam, so as to form a polymer film that has collided with ions in the beam; and chemically etching the formed polymer film so as to form openings and/or through holes corresponding to tracks left by the colliding ions in the polymer film. The ion beam () with which the polymer film is irradiated is obtained by folding a tail of an original beam () inwardly toward a center of the original beam by nonlinear focusing. The original beam is composed of ions accelerated in a cyclotron and has a cross-sectional intensity distribution profile in which an intensity is maximum at the center of the original beam and continuously decreases from the center toward the tail of the original beam, and the profile is an intensity distribution profile in a cross section perpendicular to a direction of the original beam.

Method for producing porous polymer film and porous polymer film

Provision of, and a method for production of, a polymer electrolyte membrane, which is characterized by introducing a vinyl monomer into an aromatic polymer membrane substrate, typified by polyether ether ketone, polyether imide, or polysulfone, as graft chains by graft polymerization, and then chemically converting some of the graft chains or/and part of the aromatic polymer chain into sulfonic groups.

Polymer electrolyte membrane composed of aromatic polymer membrane base and method for producing the same

An anion conducting electrolyte membrane with high performance where the electric conductivity and the water uptake are balanced, and a method of manufacturing the same are disclosed. The anion conducting electrolyte membrane comprises: a polymeric material which consists of fluorine polymer, olefinic polymer, or aromatic polymer; weak base quaternary salt obtained by the reaction of grafts introduced by graft polymerizing vinyl monomer which contains halogenated alkyl groups using radiation and strong organic bases.

Anion conducting electrolyte membrane and manufacturing method thereof

An electrolyte membrane having alkylether graft chains for use in a fuel cell produced by a method of producing an electrolyte membrane for use in a fuel cell, including: performing radiation-induced graft polymerization of a vinyl monomer having nucleophilic functional groups, the vinyl monomer selected from an acylvinyl ether derivative, a styrene derivative, and a methacrylic acid derivative, with a polymer substrate comprising a polymer selected from a fluorine-containing polymer, an olefinic polymer, and an aromatic polymer; deprotecting the nucleophilic functional group, which is protected by an ester bond, of a graft chain on the polymer substrate introduced by the radiation-induced graft polymerization; and introducing an alkylethersulfonic acid structure into the deprotected nucleophilic functional group of the graft chain, by use of an electrophilic reagent selected from cyclic sulfonic acid ester and alkylhalide-sulfonate.

Polymer electrolyte membrane having alkylether graft chain

According to one embodiment, a desalination treatment membrane includes a desalting membrane and a base material which is disposed in close contact with the desalting membrane, wherein a solid salt is fixed to the base material by a graft-polymerization.

Desalination treatment membrane

A method of producing an electrolyte membrane for use in a fuel cell, including: performing radiation-induced graft polymerization of a vinyl monomer having a nucleophilic functional group selected from an acylvinyl ether derivative, a styrene derivative, and a methacrylic acid derivative, with a polymer substrate having a fluorine-containing polymer, an olefin-containing polymer, or an aromatic polymer; deprotecting an ester bond of a graft chain on the polymer substrate introduced by the radiation-induced graft polymerization; and introducing an alkylethersulfonic acid structure into the nucleophilic functional group of the graft chain thus deprotected, by use of an electrophilic reagent selected from cyclic sulfonic acid ester and alkylhalide sulfonate.

Polymer electrolyte membrane comprising alkylether graft chain and method of producing the same

A vinyl monomer is graft polymerized on an aromatic hydrocarbon-based polymer film substrate to introduce graft chains into the substrate and thereafter a functional monomer represented by the following formula and having sulfonic acid groups or functional groups capable of conversion to sulfonic acid groups is graft polymerized to introduce the sulfonic acid groups or the functional groups capable of conversion to sulfonic acid groups: where R is an aromatic ring or an aliphatic chain; X is (1) &#x2014;OH, (2) &#x2014;OLi, &#x2014;ONa or &#x2014;OK, (3) &#x2014;F or &#x2014;Cl, or (4) &#x2014;OCHwhere n is an integer of 1 to 7. Since the graft chains obtained by graft polymerization of the vinyl monomer can also be utilized as scaffold polymers, the graft polymerizability of the functional monomer to the aromatic hydrocarbon-based polymer film substrate is sufficiently improved to enable the preparation of a polymer electrolyte membrane that excels not only in proton conductivity and mechanical strength but also in dimensional stability.

Highly proton-conductive polymer electrolyte membranes that excel in mechanical strength and a process for producing the same

An object is to provide an electrolyte membrane that maintains excellent cell characteristics for a long time under high temperature and low water retention, as this is the most important point in fuel cells. A process for producing a polymer electrolyte membrane for fuel cells is provided, which process comprises in sequence: forming graft molecular chains by graft-polymerization of a vinyl silane coupling agent on a polymer film substrate that has phenyl groups capable of holding sulfonic acid groups; introducing sulfonic acid groups into phenyl groups contained in the graft molecular chains; and hydrolyzing and condensing alkoxy groups contained in the graft molecular chains so that a silane crosslinked structure is introduced between the graft molecular chains. A polymer electrolyte membrane produced by the process is also provided.

Silane crosslinked structure-introduced fuel-cell polymer electrolyte membrane and fuel-cell electrode assembly having the same

Polymer electrolyte membranes for use in fuel cells are produced by first graft polymerizing acrylic acid derivatives or vinylketone derivatives as monomers on polymer substrates and by then performing selective conversion to a sulfonic acid group of hydrogen atoms on the carbon atom adjacent to the carbonyl in the ketone or carboxyl group on the graft chains.

Polymer electrolyte membranes comprising alkyl graft chains and a process for producing the same

By performing photograft polymerization of functional monomers such that grafted chains will be introduced from the surface of a polymer base film into its interior without deteriorating its inherent characteristics and also by creating a multiplex crosslinked structure between the grafted chains and the base film under such conditions as to cause preferential radiation-induced crosslinking reaction, there is produced a polymer electrolyte membrane having high enough oxidation resistance and proton conductivity to be suitable for use in fuel cells.

Process for producing polymer electrolyte membranes for fuel cells, polymer electrolyte membranes for fuel cells produced by the process, and fuel cell membrane-electrode assemblies using the membranes

An aromatic polymer film substrate, or a grafted aromatic polymer film substrate having a monomer introduced therein as graft chains is irradiated with ionizing radiation to impart a crosslinked structure. The aromatic polymer film substrate or the grafted aromatic polymer film substrate, provided with the crosslinked structure, is directly sulfonated to obtain a crosslinked aromatic polymer electrolyte membrane. The crosslinked aromatic polymer electrolyte membrane has low water uptake, high proton conductivity, low methanol permeability, high chemical stability, and excellent mechanical characteristics. A method for producing the crosslinked aromatic polymer electrolyte membrane is also provided.

Crosslinked aromatic polymer electrolyte membrane and method for producing same

A reflection-type liquid crystal display device, having a pair of substrates, at least one of which is transparent, a liquid crystal layer sandwiched between the pair of substrates, a light reflector section provided between the liquid crystal layer and one of the pair of substrates, and a polymeric medium layer with fine silver particles precipitated on the surface, as formed at the light reflector section. The reflection-type liquid crystal display is produced by the steps of: applying a mixture containing monovalent silver and a photosensitive polymeric medium; exposing the mixture to light, thereby photolithographically forming a light reflector layer of desired pattern; heating the light reflector layer under a predetermined temperature condition, thereby precipitating fine silver particles on the surface of the light reflector layer; and confronting a transparent substrate with the light reflector layer-formed substrate, and sandwiching a liquid crystal layer between the substrates.

Reflection-type, liquid crystal display device and process for producing the same

A normally closed liquid crystal display device using an in-plane switching mode prevented from light leakage caused by spacer beads and having a high contrast ratio can be produced by making a pretilt angle between an alignment control film and liquid crystals 4&deg; or less and controlling a light leakage centering the spacer in 4-divided shapes; or by placing a film provided with a liquid crystal alignment controlling function by irradiation with polarized light between the spacer and a liquid crystal layer, the spacer being present in a pair of substrates.

Liquid crystal display device with spacers controlling thickness of liquid crystal layer

Normally closed liquid crystal display device using spacers coated with material having liquid crystal aligning ability by irradiation with polarized light

A photosensitive composition comprising a polyimide precursor, a photosensitive material having a structure represented by the following formula

Photosensitive resin composition, method for forming pattern therefrom, electronic devices produced by using the same, and method for production thereof

Growing community of inventors

Takasaki, Japan

Yasunari Maekawa