Abstract:
PURPOSE: A biodegradable porous polymer supporter for the tissue engineering and its preparation method are provided, to obtain the open cell-structured porous polymer supporter with an improved degree of pore and to allow the size of pore to be controlled. CONSTITUTION: The biodegradable porous polymer supporter is prepared by making a polymer species by using a polymer solution containing a biodegradable polymer and an anisotropic mixture; boiling(foaming) the polymer species in a boiling medium; and drying it. Preferably the biodegradable polymer is selected from the group consisting of poly(glycolic acid), poly(lactic acid), poly(lactic acid-glycolic acid) copolymer, poly(ε-caprolactone), poly(amic acid), polyanhydride, poly(ortho-ester), their derivatives, and their mixtures; and has a molecular weight of 5,000-2,000,000. The anisotropic mixture comprises a carbonate and an organic acid. Preferably the carbonate is selected from the group consisting of sodium hydrogen carbonate, sodium carbonate, ammonium hydrogen carbonate, ammonium carbonate, potassium hydrogen carbonate, potassium carbonate, calcium carbonate, and their mixtures; and the organic acid is selected from the group consisting of citric acid, succinic acid, tartaric acid, succinic acid, maleic acid, fumaric acid, malonic acid, malic acid, gluconic acid, mucic acid, some amino acids and their mixtures.
Abstract:
본 발명은 조직공학용 생분해성의 다공성 고분자 지지체의 제조방법에 관한 것으로서, 상기 방법은 생분해성 고분자와 비등성 혼합물이 함께 함유된 고분자용액을 이용하여 고분자 시편을 만든 다음 알콜 혼합수용액과 같은 비등 매질 하에서 비등(발포)하고 건조하는 단계를 포함한다. 본 발명은 또한 상기 방법에 의해 제조된 조직공학용 생분해성의 다공성 고분자 지지체에 관한 것으로서, 상기 생분해성의 다공성 고분자 지지체는 기공의 크기의 조절이 용이하고 다공도가 높으며 기공간 상호 연결되어 있는 연속 기포 구조(open cell structure)를 갖는 것을 특징으로 한다. 본 발명에 따른 생분해성의 다공성 고분자 지지체 및 그 제조방법은 기존의 고분자 지지체(scaffold)의 제조시 일반적으로 적용해온 염 침출법 (salt leaching technique)과 가스 발포법 (gas foaming technique)에 의해 발생하는 지지체 표면의 다공성 막힘 현상, 복잡한 제조과정 및 유해 물질의 분비 및 잔존 현상을 해결할 수 있는 대체 방안임과 아울러 거의 모든 조직 및 장기를 조직공학적으로 재생할 수 있다는 장점으로 가지고 있다.
Abstract:
PURPOSE: A method for forming a fine fluorescent image by using protected hydroxy group-containing anthraquinone derivatives or naphthacenequinone derivatives is provided. Thereby the obtained protected hydroxy group-containing compound can be applied to recording material and censor material because it can easily form a fine fluorescent image of micrometer units under the condition of a chemically amplified fine image forming process. CONSTITUTION: This method comprises the steps of: preparing a transparent solution by dissolving protected hydroxy group-containing anthraquinone derivatives of formula 1 or naphthacenequinone derivatives of formula 2 and a soluble polymer in an organic solvent; forming a thin film by coating the solution on a substrate; prebaking the thin film coated substrate; and removing a hydroxy protecting group of the anthraquinone derivatives or naphthacenequinone derivatives by treating under the condition of a chemically amplified fine image forming process.
Abstract:
본 발명은 종래 치과수복용 프리폴리머로 사용되고 있는 2,2-비스-(4-(2-히드록시-3-메타크릴로일옥시프로폭시)페닐)프로판 [이하, "Bis-GMA"라 명명함]에, 이 Bis-GMA 분자 중의 히드록시기의 수소 원자를 메타크릴레이트기로 치환한 멀티메타크릴레이트기 함유 다관능성 프리폴리머를 혼합한 프리폴리머 혼합물을 기재로 하고, 희석제, 무기 충전제, 광개시계 및 기타 첨가제를 포함하는 치과수복용 광중합성 복합레진 조성물에 관한 것이다. 다관능성 프리폴리머 혼합물을 기재로 하는 본 발명의 치과수복용 광중합성 복합레진 조성물은 기재로서 Bis-GMA 자체만을 포함하는 종래의 것보다 우수한 물리적, 기계적 특성과 생체 적합성을 나타낸다.
Abstract:
PURPOSE: A method for forming a fine fluorescent image by using protected hydroxy group-containing anthraquinone derivatives or naphthacenequinone derivatives is provided. Thereby the obtained protected hydroxy group-containing compound can be applied to recording material and censor material because it can easily form a fine fluorescent image of micrometer units under the condition of a chemically amplified fine image forming process. CONSTITUTION: This method comprises the steps of: preparing a transparent solution by dissolving protected hydroxy group-containing anthraquinone derivatives of formula 1 or naphthacenequinone derivatives of formula 2 and a soluble polymer in an organic solvent; forming a thin film by coating the solution on a substrate; prebaking the thin film coated substrate; and removing a hydroxy protecting group of the anthraquinone derivatives or naphthacenequinone derivatives by treating under the condition of a chemically amplified fine image forming process.
Abstract:
PURPOSE: A photopolymerizable composite resin composition for dental restoration using a multifunctional prepolymer mixture as a base material is provided, which has increased biocompatibility as well as exhibiting better physical and mechanical properties as compared to conventional compositions based on only Bis-GMA itself. CONSTITUTION: This composite resin composition comprises 2 to 40% by weight of multifunctional prepolymer mixture of 2,2-bis-(4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl)propane ("Bis-GMA") of formula 1 and tri-GMA of formula 2 in a ratio of 95:5 to 5:95, 1 to 20% by weight of a diluent, 40 to 95% by weight of an inorganic filler, a photoinitiation system, and other additives. The composition has almost no cytotoxicity and high strength and hardness.
Abstract:
PURPOSE: The pyridyl benzoxazole derivatives, their copolymers, and a fluorescence image making method are provided, thereby the pyridyl benzoxazole copolymers have good sensor properties in solution, film and particle status, so that they can be used as recording materials or sensor materials. CONSTITUTION: The pyridyl benzoxazole derivative is represented by formula (1), in which A and B are independently CH and N; R1 is alkyl or phenyl; R2 is O or NH, R3 is vinyl, acryl, allyl, alpha-methylvinyl or 4-vinylphenyl; m is an integer from 0 to 20. The pyridyl benzoxazole copolymer represented by formula (2) is produced by radical polymerization of comonomer selected from the group consisting of pyridyl benzoxazole derivatives, styrene, maleimide and methacrylate, in which A and B are independently CH and N; R1 is alkyl or phenyl; R2 is O or NH, m is an integer from 0 to 20; R4 is hydrogen or methyl; R5 is methyloxycarbonyl or phenyl; and x and y are integer from 10 to 5000. The fluorescence image making method comprises the steps of: dissolving pyridyl benzoxazole copolymer of formula (2) wherein A is CH and B is N, AIBN, organic acid or inorganic acid in an organic solvent; coating the solution on board and drying to form a thin layer; prebaking the thin layer; and exposing the thin layer to light using photomask and post-exposure baking it.