Abstract:
PURPOSE: Provided is a new polymeric carrier maximized in efficiency of drug delivery to cancer cells by use of proteins or peptides, which are capable of being decomposed by MMPs specifically present in cancer cells in great quantity, as a carrier of an anticancer substance. Therefore, the carrier provides high anticancer activity with a low amount of drugs and removes cytotoxicity from normal cells. CONSTITUTION: In the anti-cancer drug carrier which can specifically target tumor, an anticancer substance to be delivered to a target cell is chemically bound to at least one functional group of a carrier. Proteins or peptides are capable of being decomposed by matrix metalloproteinase, has a molecular weight of 500 to 1,000,000 daltons and used as a transfer medium.
Abstract:
본 발명은 화학식 1로 표시되는 3,6-디[4-(n-알킬옥시)페닐]파이로멜리트산 이무수물 및 그 제조방법; 상기 이무수물을 단위체로 이용하여 제조되는 화학식 3으로 표시되는 폴리이미드 및 그 제조방법; 그리고 상기 폴리이미드를 포함하는 배향막을 구비한 액정표지소자에 관한 것으로, 본 발명에 따른 3,6-디[4-(n-알킬옥시)페닐]파이로멜리트산 이무수물은 폴리이미드, 폴리이미다조피롤론, 가교 폴리에스테르 또는 폴리아미드 등의 고분자 합성을 위한 단위체로서 유용하게 사용되며, 특히 화학식 1로 표시되는 이무수물로부터 제조되는 폴리이미드는 통상의 방향족 폴리(파이로멜리트 이미드)에 비하여 유기용제에 대한 우수한 용해 특성을 지니므로 폴리이미드 전구체인 폴리아믹산을 거치지 않고 직접 가공할 수 있을 뿐만 아니라, 상기 폴리이미드를 포함하는 배향막을 구비한 액정표시소자는 배향의 열적 안정성이 우수하고, 수평배향 특성이 우수하여 광시야각이 우수한 액정 배향제 및 액정표시소자의 제조에 매우 유용할 것이다.
Abstract:
PURPOSE: 3,6-dialkyloxypyromellitic dianhydrides, a preparation process thereof and polyimides produced therefrom are provided. The 3,6-dialkyloxypyromellitic dianhydrides are useful as a monomer for synthesis of polymers and polyimides having improved solubility in organic solvent. CONSTITUTION: 3,6-dialkyloxypyromellitic dianhydrides are represented by formula(1), wherein R is independently alkyl having 2 to 24 carbon numbers. Their preparing process comprises the steps of: (a) dissolving N,N'-bis(4-butylphenyl)-3,6-dihydroxypyromellitic diimide and alcohol(ROH) in an organic solvent, and Mitsunobu-reacting them under argon condition to prepare N,N'-bis(4-butylphenyl)-3,6-dialkyloxypyromellite diimide of formula(4); (b) hydrolysis of N,N'-bis(4-butylphenyl)-3,6-dialkyloxypyromellitic diimide of formula(5) to prepare 3,6-dialkyloxypyromellitic acid of formula(6); and (c) cyclodehydration of 3,6-dialkyloxypyromellitic acid of formula(6).
Abstract:
PURPOSE: Provided is a polyphenylene vinylene based polymeric light-emitting material, which has excellent thermal and electrical stability, solubility, light emission efficiency and color purity sufficient to be used as a green light-emitting material of an ELD. CONSTITUTION: The polyphenylene vinylene derivative as a light-emitting material is represented by the formula 1, wherein R is a silyl group, a C1-C20 alkyl or cycloalkyl group, a phenyl-substituted silyl group, an C1-C20 alkoxy group, or a phenyl-substituted C1-C20 alkoxy group; m is an integer of 1-5; and n is an integer or 2 or more.
Abstract:
PURPOSE: Provided are a poly(biphenylene oxide) substituted with trifluoromethyl and a poly(arylene ether) substituted with trifluoromethyl, which are excellent in thermoplasticity, solubility, processability, heat-resistance, and optical property, therefore useful as electric and electronic materials or optical materials. CONSTITUTION: The poly(biphenylene oxide) represented by the formula 1 is produced by a process containing the steps of: dissolving a monomer represented by the formula 4 in a polar protic solvent; adding 1.5-1.7 equivalent of potassium carbonate and stirring at 130-150deg.C for 2-6 hours to prepare a phenoxide salt; raising the temperature to be 180-200deg.C and stirring for 8-14 hours. And the poly(arylene ether) represented by the formula 7 is produced by a process containing the steps of: dissolving a monomer represented by the formula 8 and a dihydroxy compound in a polar protic solvent; adding 1.5-1.7 equivalent of potassium carbonate and stirring at 130-150deg.C for 2-6 hours to prepare a phenoxide salt; increasing the temperature to be 165-185deg.C and stirring for 8-14 hours. In the formula 7, R is C1-C100 linear or branched alkyl, aromatic ring, or a mixed functional group thereof.
Abstract:
본 발명은 열경화성 수지내에 고성능 열가소성 강인화제를 두께가 균일한 필름 혹은 균일한 분포의 입자상으로 도입하고, 열경화성 수지의 반응속도와 열가소성 강인화제의 용해 속도를 조절함으로써, 열경화성 수지내에 열가소성 강인화제의 농도 구배에 따른 몰폴로지 스펙트럼을 형성시켜, 적은 양의 열가소성 강인화제로 강인성이 우수한 열경화성 수지를 제조하는 방법에 관한 것이다. 본 발명에 의하면, 20 중량% 미만의 열가소성 강인화제로도 내화학성, 내열성 및 강인성이 우수한 열경화성 수지가 제조될 수 있다. 따라서, 본 발명의 방법으로 제조된 고강인성 열경화성 수지는 고강성, 고강도, 고내열성이 요구되는 구조용 고분자 재료에 유용하게 이용될 수 있다.
Abstract:
PURPOSE: A process for preparing the title composition by introducing low concentration thermoplastic resin in a particle form into thermoplastic resin and controlling the solution and diffusion velocity of the added thermoplastic particles having high tenacity is provided, thereby a thermoplastic resin composition having excellent tenacity as compared to conventional thermoplastic/thermosetting resin composition comprising only sea-land morphology is produced. CONSTITUTION: This thermoplastic resin composition having high tenacity is prepared by the process of: preparing high performance thermoplastic resin having a size of 2 to 200micrometer in a particle form; precuring by adding a curing agent and a catalyst to thermoplastic resin; mixing 90 to 99% by weight of the precured thermoplastic resin and 1 to 10% by weight of the high performance thermoplastic resin; and reacting the precured thermoplastic resin and the thermoplastic resin mixture.