Abstract:
본 발명은 중금속 이온을 선택적으로 분리하기 위한 다공성 각인 고분자 입자의 제조방법으로서, (S1) 금속염 용액, 산성 단량체 및 염기성 단량체를 반응시켜 금속염-산성 단량체 착물 용액을 제조하는 단계; (S2) 안정제 수용액을 제조하는 단계; (S3) (S1) 단계에서 수득된 금속염-산성 단량체 착물 용액과 (S2) 단계에서 수득된 안정제 수용액을 혼합한 후, 상기 혼합 용액에 다공성제 용액(porogenic solvent)을 혼합하는 단계; (S4) (S3) 단계에서 혼합된 혼합용액을 중합 반응시켜 금속이온이 함유된 고분자를 수득하는 단계; 및 (S5) (S4) 단계에서 수득된 고분자로부터 금속이온을 제거하는 단계를 포함하는 중금속 이온을 분리할 수 있는 다공성 각인 고분자 입자의 제조방법을 제공한다. 본 발명에 따른 다공성 각인 고분자 입자의 제조방법은 중금속 이온의 흡착 사이트 수의 조절이 용이하며, 흡착력이 매우 우수하며, 선택성을 사용 용도에 따라 임의적으로 부여할 수 있으며, 재생 효과가 매우 뛰어나며, 반응 시간을 줄일 수 있어 매우 경제적이다. 다공성 각인 고분자, 중금속 이온, 분리, 금속염, 산성 단량체, 염기성 단량체
Abstract:
PURPOSE: A potential for hydrogen(pH)-sensitive poly aspartamide graft copolymer, and a manufacturing method thereof are provided to simply manufacture the copolymer with the graft reaction, and to secure the harmlessness to the human body. CONSTITUTION: A pH-sensitive poly aspartamide graft copolymer is formed with a recurring unit marked with chemical formula 6, and has the molecular weight of 34,000~53,000. A manufacturing method the pH-sensitive poly aspartamide graft copolymer comprises a step of adding octadecylamine, 1-(3-aminopropyl)imidazole, and O-(2-aminoethyl)-O'-methylpolyethylene glycol to polysuccinimide.
Abstract:
A method for preparing polymethylmetacylates copolymerized with a permanent antistatic agent is provided to save the costs due to excellent performance and copolymerization feature of PMMA and to be used for an anti-static film, a construction material for durability and a packing material. A method for preparing an antistatic copolymer comprises (i) a step for synthesizing a acryl phosphate monomer by reacting a compound indicated as the chemical formula I and a compound indicated as the chemical formula II, with a monomethyl hydroquinone under the nitrogen atmosphere; (ii) a step for mixing the acryl phosphate monomer synthesized in the step (i) and methylmethacrylate in the presence of an initiator; and (iii) a step for performing copolymerization by heating the mixture of the step (ii).
Abstract:
A method for preparing crude lactide is provided to maximize production yield, to minimize racemization and to obtain the lactide of molten state by optimizing the reaction condition. A method for preparing crude lactide comprises the steps of preparing the poly(lactic acid) having a low molecular weight from lactic acid; and reacting the poly(lactic acid) having a low molecular weight in the presence of a catalyst at a high temperature and at a high pressure. Preferably the molecular weight of the poly(lactic acid) having a low molecular weight is 300-5,000 g/mol; and the catalyst is a metal oxide, a metal halide or a metal carboxylate containing a metal selected from the group consisting of Sn, Zn, Fe and Sb.
Abstract:
A method for purifying optically pure lactide is provided to improve purification efficiency by controlling agitation temperature, agitation time, agitation solvent and agitation speed, thereby minimizing concentration of meso-lactide, so that the optically pure lactide is useful for preparing poly(L-lactic acid). A method for purifying optically pure D, L-lactide comprises the steps of: (a) adding crude lactide into a solvent; (b) agitating the solution of crude lactide and solvent of step (a) at 5-45 deg. C and 10-500 rpm for 20-120 minutes; (c) centrifuging the agitated solution of step (b); and (d) drying the centrifuged product, wherein the agitation solvent is selected from water, methyl alcohol, ethyl alcohol, tertiary amyl alcohol and tertiary butyl alcohol.
Abstract:
본 발명은 연료전지에 사용될 수 있는 이온전도성 고분자 전해질 복합막의 제조 방법으로 이온전도성 고분자 전해질막과 염기성 고분자를 적절한 비율로 섞은 후에 무기물질을 함유시켜 고온에서 높은 이온전도도를 유지하고 장기적 안정성을 향상시키며, 연료의 투과를 방지하는 연료전지용 고분자 전해질 복합막의 제조 방법, 이 방법에 의하여 제조된 복합막, 이 복합막을 채용한 전해질막-전극 접합체 그리고 상기 복합막 또는 MEA를 채용한 연료전지에 관한 것이다. 이로 인하여 연료전지의 장기적 안정성 및 성능이 향상되었다. 연료전지, 전해질 복합막, MEA
Abstract:
Provided are a polyelectrolyte composite membrane for a fuel cell which lowers the penetration of a fuel material by modifying the surface of an ion conductive polymer electrolyte membrane, and a method for preparing the polyelectrolyte composite membrane. The polyelectrolyte composite membrane is an acid/base/inorganic polyelectrolyte membrane comprising an acidic polyelectrolyte membrane, a basic polymer and an inorganic material. Preferably the basic polymer is selected from the group consisting of polybenzimidazole, polyethyleneimine, polyaniline, poly(4-vinyl pyridine) and polypyrrole; and the inorganic material comprises zirconium phosphate or zirconium phosphate derivatives, and the zirconium phosphate or the zirconium phosphate derivatives has an alpha or gamma-form.