Abstract:
An interlocking membrane/electrode assembly based on cross-linkable polymers is provided to have good interfacial stability owing to excellent adhesion between a polymer electrolyte membrane and electrodes. The interlocking membrane/electrode assembly based on cross-linkable polymers is manufactured by the steps of: dissolving cross-linkable sulfonated polyethersulfone in a solvent to make a homogeneous solution, and then coating a glass substrate with the homogeneous solution to form an electrolyte membrane; mixing a cross-linkable sulfonated polyethersulfone as a binder of an electrode with a catalyst and a dispersing solvent to prepare a catalytic ink of an electrode, and then introducing the prepared catalytic ink into an electrode; and preparing MEA(membrane/ electrode assembly) using the prepared electrolyte membrane and the prepared electrode.
Abstract:
A liquid crystal alignment layer and a method for manufacturing the same are provided to induce the flexibility of a photo-reactive polymer, by reacting the photo-reactive polymer with a plasticizer. For forming a liquid crystal alignment layer, a photo-reactive polymer and a plasticizer are dissolved in an organic solvent. The plasticizer has a weight of 50 to 500 percents in comparison with the photo-reactive polymer. The mixture of the photo-reactive polymer and the plasticizer is coated on a glass substrate. The glass substrate having the coated mixture is thermally heated to obtain the liquid crystal alignment layer. An ultraviolet light is applies onto the obtained liquid crystal alignment layer.
Abstract:
Provided is a polymer electrolyte composition for a direct methanol fuel cell which is minimized in methanol crossover, is thin and is improved in mechanical properties and hydrogen ion conductivity. The polymer electrolyte composition comprises an ionomer A comprising a perfluorate-based main chain; and 0.01-99.99 wt% of a hydrocarbon-based ionomer B having a crosslinked main chain. Preferably the hydrocarbon-based ionomer B is obtained by crosslinking a mixture of a monomer containing an ionic group, a crosslinking agent, a monomer for controlling mechanical properties and an initiator. Preferably the ionic group of the monomer containing an ionic group is a sulfonic acid group or a carboxylic acid group; and the monomer for controlling mechanical properties is at least one selected from vinyl-based, acrylate-based and methacrylate-based monomers.
Abstract:
본 발명은 액정 배향막을 제조하는 방법에 있어서, 배향막 재료가 형성된 기판 위에 소정 형상의 미세구조를 가진 금속몰드를 놓고 열 또는 압력을 가하여 처리하는 것을 포함한다. 특히 유기고분자화합물을 배향막 재료로 하여 형성된 기판 위에, 자외선에 변화하는 폴리머에 자외선을 경사지게 쪼여 미세구조의 전기도금으로 제작된 금속몰드를 이용하여 액정 배향막을 제조하는 방법을 포함한다. 구체적으로 폴리이미드계, 폴리아미드산이미드계, 폴리이미드실록산계, 폴리아미드이미드계의 유기고분자화합물 중에서 선택된 1종 이상을 유기용매에 용해시켜 기판 위에 도포하는 단계와, 소정 형상의 미세구조를 가진 금속몰드를 제조하는 단계 및 상기 금속몰드를 상기 유기고분자화합물이 도포된 기판 위에 놓고 열 또는 압력을 가하여 처리하는 단계를 포함한다. 본 발명에 의하면, 액정 배향막의 액정 정렬도(order parameter), 방위각상 앵커링 에너지(azimuthal anchoring energy), 선경사각(pretilt angle) 등을 높이는 효과를 얻을 수 있다. 액정 배향막, 금속몰드, 유기고분자화합물, 폴리이미드
Abstract:
A method for preparing an electrode binder for a polymer electrolyte fuel cell is provided to produce an inexpensive polymer binder having good compatibility with a polymer electrolyte membrane, high proton conductivity, and high diffusivity. A method for preparing an electrode binder for a polymer electrolyte fuel cell includes a step of introducing a polymer having compatibility into a hydrocarbon-based polymer having proton conductivity to prepare a mixed binder, wherein the hydrocarbon-based polymer is used as a matrix. A content of the polymer having compatibility with an electrode binder is 0.1-99.9wt% based on the hydrocarbon-based polymer having proton conductivity. The hydrocarbon-based polymer having proton conductivity has a number average molecular weight of 1,000-1,000,000 and a weight average molecular weight of 1,000-1,000,000.
Abstract:
A method for producing a polymer electrolyte membrane for a fuel cell is provided to improve the proton conductivity of a polymer electrolyte membrane and to realize excellent compatibility with a binder for an electrode. A method for producing a polymer electrolyte membrane for a fuel cell comprises the steps of introducing a sulfonated hydrofluoride-based polymer to a sulfonated hydrocarbon-based polymer. The sulfonated hydrocarbon-based polymer has a number average molecular weight of 1,000-1,000,000 and a weight average molecular weight of 1,000-1,000,000 and the sulfonated hydrofluoride-based polymer has a number average molecular weight of 1,000-1,000,000 and a weight average molecular weight of 1,000-1,000,000. The polymer electrolyte membrane comprises 80-99.9 wt% of the sulfonated hydrocarbon-based polymer and 0.1-20 wt% of the sulfonated hydrofluoride polymer.
Abstract:
본 발명은 고분자 전해질 막과 전극의 바인더 사이의 가교를 통한 연료전지용 일체형 막/전극(MEA; membrane/electrode assembly)에 관한 것이다. 보다 상세하게는 가교 가능한 술폰화 폴리에테르 술폰을 용매에 녹여 균일한 용액을 만들고 유리판에 도포하여 전해질 막을 형성시키는 단계와, 가교 가능한 술폰화 폴리에테르 술폰을 전극의 바인더로 사용하여 촉매 및 분산용매와 섞어 전극의 촉매잉크를 제조하고 이를 전극에 도입하는 단계와, 상기 단계에서 제조된 전해질 막과 전극을 이용하여 MEA를 제조하는 단계로 구성된다. 이 과정에서 열가교를 통해 전해질 막과 전극 사이의 강한 접착력을 얻는다. 본 발명에서는 고분자 전해질 막으로 가교 가능한 말단을 가진 탄화수소 계열의 고분자를 합성하고, 동일한 고분자를 전극의 바인더로 적용함으로써, MEA 제조과정에서 막과 전극 사이의 가교반응을 유도한다. 상기 방법을 이용하여 막과 전극 사이의 우수한 계면 안정성을 나타내는 새로운 형태의 일체형 MEA를 제공할 수 있다. 막/전극 일체형 MEA, 고분자 전해질 막, 전극의 바인더, 가교반응, 계면 안정성
Abstract:
The present invention is directed to a polymer electrolyte composition for a direct methanol fuel cell which comprises a perfluorinated ionomer (A) and a crosslinked hydrocarbon-based ionomer (B). In some embodiments, the crosslinked hydrocarbon-based ionomer (B) can be obtained by crosslinking a mixture of a monomer containing ionic groups b 1 , a crosslinking agent b 2 , a monomer for controlling mechanical properties b 3 and an initiator b 4 . The polymer electrolyte composition can minimize methanol crossover, exhibit improved proton conductivity and exhibit excellent mechanical properties.