Abstract:
Provided are an aliphatic polyester grafted with polyethylene glycol having a functional group which is biodegradable and whose content of the polyethylene glycol can be controlled easily, and its preparation method. The aliphatic polyester is represented by the formula 1, wherein X is an aliphatic ester repeating unit; R is H or a C1-C5 alkyl group; Z is the moiety of an initiator or a chain transfer agent; m/l is 0.1-50; n is an integer of 2-50; x is a positive integer; and y is an integer of 1-200. Preferably X is any one selected from the group consisting of lactide, glycolide, caprolactone, beta-propiolactone, gamma-butyrolactone and p-dioxanone. The method comprises the steps of ring opening polymerizing an aliphatic ester cyclic compound and an epoxy-based monomer having a double bond at an alkyl chain terminal; and radical polymerizing the polyethylene glycol where a certain polymerizable functional group is introduced with the obtained compound.
Abstract:
PURPOSE: An electrode-binder solution composition is provided to prevent agglomeration between a polymer dissolved in a solvent and a solvent catalyst by maximizing tertiary interface formation by formed a catalyst/binder/fuel. CONSTITUTION: An electrode-binder solution composition comprises 5~40 weight% of a sulfonated proton conducting hydrocarbon-based polymer and 60~95 weight% of a mixed solvent of solvent and non-solvent. The lfonated proton conducting hydrocarbon-based polymer has 10~80 mol% of degree of sulfonation. The solvent is one or two or more kinds of selected from N-methylpyrrolidone, dimethylformamide, dimethylacetamide, dimethylsulfoxide and ethanol. The nonsolvent is one or two or more kinds of selected from acetone, tetrahydrofuran, isopropylalcohol, acetic acid and methanol.
Abstract:
A method for preparing an interlocked membrane/electrode assembly having a crosslinkable coating layer is provided to improve a bonding property between a membrane and an electrode through a crosslinking reaction of the crosslinkable coating layer. A method for preparing an interlocked membrane/electrode assembly having a crosslinkable coating layer includes the steps of: preparing a crosslinkable coating solution; impregnating a membrane with the prepared coating solution to form a crosslinkable coating layer on the surface of the membrane; and preparing the membrane/electrode assembly using an electrode and the prepared membrane having the crosslinkable coating layer.
Abstract:
본 발명은 주쇄가 퍼플루오로네이트계 수지로 이루어진 이오노머에 불화수소계열 고분자와 퍼플루오로네이트계 고분자로 이루어진 블렌드를 양면에 얇게 코팅하여 직접 메탄올 연료전지용 다층 박막의 수소 이온 교환막의 제조방법에 관한 것이다. 상기 구성에 의하면 종래 사용되는 직접 메탄올 연료전지용 고분자막에 비해 메탄올 크로스오버를 억제하고, 전극간의 계면 접착성이 우수하여 셀의 장기 안정성이 확보되는 우수한 고분자 전해질을 제조할 수 있다.
Abstract:
본 발명은 주쇄가 퍼플루오로네이트계 수지로 이루어진 이오노머에 불화수소계열 고분자와 퍼플루오로네이트계 고분자로 이루어진 블렌드를 양면에 얇게 코팅하여 직접 메탄올 연료전지용 다층 박막의 수소 이온 교환막의 제조방법에 관한 것이다. 상기 구성에 의하면 종래 사용되는 직접 메탄올 연료전지용 고분자막에 비해 메탄올 크로스오버를 억제하고, 전극간의 계면 접착성이 우수하여 셀의 장기 안정성이 확보되는 우수한 고분자 전해질을 제조할 수 있다.
Abstract:
본 발명은 불화수소계열 고분자와 주쇄가 퍼플루오로네이트계인 이오노머를 포함하는 직접 메탄올 연료전지용 고분자 전해질 조성물에 있어서, 주쇄가 탄화수소계인 이오노머 예를 들면 술폰화된 스티렌계 고분자 이오노머, 아크릴산계 고분자 이오노머 및 이들 고분자 이오노머의 2종 이상의 혼합 이오노머를 포함하는 직접 메탄올 연료전지용 고분자 전해질 조성물을 개시한다. 상기 구성에 의하면 종래 사용되는 직접 메탄올 연료전지용 고분자막에 비해 메탄올 크로스오버를 최소화하고, 두께가 얇으면서도 기계적 물성 및 수소이온 전도 특성이 우수한 고분자 전해질을 제조할 수 있다.
Abstract:
PURPOSE: Provided is a polymer electrolyte composition for a direct methanol fuel cell, which minimizes the crossover of methanol, and has a small thickness and excellent mechanical properties and hydrogen ion conductivity. CONSTITUTION: The polymer electrolyte composition comprises a hydrogen fluoride-based polymer and a perfluorinated ionomer as a main chain, wherein the polymer electrolyte composition further comprises a hydrocarbon based-ionomer as a main chain. In particular, the hydrocarbon-based ionomer as a main chain is selected from the group consisting of a sulfonated styrene polymeric ionomer, an acrylate polymeric ionomer and a mixed ionomer containing two or more of the aforesaid polymeric ionomers.