친환경 응집제의 제조에 있어서 그래프팅 및 그래프팅효율에 영향을 미치는 인자들

민성기 ( Seong Kee Min ),박찬영 ( Chan Young Park ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.1

With the incorporation of hydrogen peroxide(H2O2) and NaLS as an initiator and emulsifier, acrylic acid monomer was graft copolymerized with sodium alginate prepared from alginic acid, and then the grafted copolymer was confirmed through IR spectrometer. When the amounts of acrylic acid increased the grafting also showed increasing trend. While the contents of hydrogen peroxide was varied in the aqueous sodium alginate solution, the grafting efficiency decreased gradually as the amounts of initiator increased.

Amidoxime 에 의한 금속 추출 평형 및 추출 속도

신정호,민성기,정갑섭,김주석 ( Jeong Ho Shin,Seong Kee Min,Kap Seop Jeong,Joo Seok Kim ) 한국공업화학회 1994 공업화학 Vol.5 No.1

금속의 용매 추출에 amidoxime의 추출제로서의 특성을 검토하기 위하여 benzamidoxime 및 phenyla-cetamidoxime에 의한 금속 추출평형 및 추출속도에 관한 실험 및 이론적 고찰을 하였다. Cu, Pb, Zn 및 Cd등 단독 금속 계와 혼합 금속계에 대한 amidoxime-클로로포름에 의한 추출에서 추출비와 수소이온 농도 및 추출제 농도간의 상관관계로부터 추출기구와 추출성을 검토하고, 수상측 경막 내 확산 방정식으로부터 도출된 이론적 속도식과 실험적 속도식을 비교함으로써 초기 추출 속도식은 R_o=k(C)-_(HRD)(C_(MO)/C(HO))^(1/2)로 표시할 수 있었으며, 추출과정의 율속 단계를 고찰하였다. amidoxime에 의한 Cu의 추출 화학종은 (CuR)-_2의 형이었다. The kinetics and equilibrium of metal extraction by benzamidoxime and phenylacetamidoxime-chloroform were investigated to apply amidoxime to metal extraction as chelating agent. The overall extraction constant, extraction mechanism and selective extraction of copper were examined from the relation among extraction ratio, hydrogen ion concentration and extractant concentration. The experimental rate equation of copper extraction coincided with the theoretical rate equation and was expressed as R_o=k(C)-_(HRo)(C_(Mo)/C^(Ho))^(1/2). The chemical species extracted was found to the type of (CuR)-_2.

PAC 응집제 종류에 따른 조류가 포함된 상수원수의 부상분리효율 비교

박종원,민성기,이혜연,윤철종,이창한,Jong-Won Park,Seong-Kee Min,Hye-Yeon Lee,Churl-Jong Yun,Chang-Han Lee 한국환경과학회 2023 한국환경과학회지 Vol.32 No.5

This study used a batch DAF (dissolved air flotation) jar tester to evaluate the algae removal efficiency of alum and PAC coagulants during coagulation, flocculation, and flotation. Optimal coagulant dosages were 0.06 ~ 0.15 mL/L (12.0 ~ 26.0 mg Al/L,17%), 0.08 ~ 0.20 mL/L (10.0 ~ 24.0 mg Al/L, 12%), 0.25 ~ 0.30 mL/L (25.0 ~ 30.0 mg Al/L, 10%) for PAC, and 3.0 ~ 5.0 mL/L (81.0 ~ 135.0 mg Al/L, 2.7%) for alum. Turbidity of treated water was 1.0 ~ 2.0 NTU in optimal coagulation, flocculation, and flotation conditions for the four coagulants types. The amount of coagulant injected tended to decrease with increasing Al content in the coagulant, as follows : 17% PAC < 12% PAC < 10% PAC < 2.7% alum. Turbidity removal efficiencies were in the order of 12% PAC (93.6%) > 10% PAC (92.7%) > 17% PAC (91.3%) > 2.7% Alum (88.1%).

수화겔의 상전이에 관한 연구: (I)폴리(N-이소프로필아크릴아미드)겔의 부피상전이

박상보,민성기,Park, Sang-Bo,Min, Seong-Kee 한국인쇄학회 2003 한국인쇄학회지 Vol.21 No.1

Equilibrium swelling curves of N-isopropyl acrylamide(NIPA) gel and its ionized copolymer gels were obtained as a function of temperature. Discontinuous volume changes of the gels were observed. Phase transition temperature was increased with the ionized counter parts of the gels. Equilibrium swelling of ionized copolymer gel cylinder was found to depend strongly on their diameters. Crosslinking density of NIPA gel was adjusted by increasing N,N'-methylenebisacrylamide(BIS). Phase transition temperature was increased with the crosslinking density.

양 말단에 MPTMS-아크릴아미드로 치환된 폴리이미드의 합성

민준호,박찬영,민성기,Min, Jun Ho,Park, Chan Young,Min, Seong Kee 한국재료학회 2016 한국재료학회지 Vol.26 No.9

An amide group was introduced to restrain the cohesion of silica nano-particles and copolymerized with polyamic acid. Amide block copolymers were prepared using silica and (3-mercaptopropyl) trimethoxysilane (MPTMS) with a siloxane group, using 2, 6-Lutidine as a catalyst. Amide block polymers and copolymers were synthesized via ATRP after brominating pyromellitic dianhydride (PMDA) and polyamic acid of methylene diphenyl diamine (MDA) using ${\alpha}$-bromo isobutyryl bromide. Characteristic peaks of copolymer with amide and imide groups and patterns of amorphous polymers were studied using FT-IR and XRD analyses; an analysis of the surface characteristic groups was conducted via XPS. Changes in the thermal properties were examined through DSC and TGA; solubility for solvents was also studied.

마이크로파에 의한 고무용 충전제로서의 Alumina Powder 의 제조에 관한 연구

박찬영,황은희,민성기 ( Chan Young Park,Eun Hee Hwang,Seong Kee Min ) 한국고무학회 1998 엘라스토머 및 콤포지트 Vol.33 No.3

N/A Alumina powders used as a filler in rubber compounding was extracted from kaolin in H₂SO₄ solution employing conventional thermal and microwave energy resources. Maximum degrees of alumina extraction from kaolin were 72.8% at 80℃, 1M H₂SO₄, and 180min in the conventional thermal extraction process and were 99.0% at, 90℃, 1M H₂SO₄, and 60min in the microwave extraction one, respectively. The samples synthesized in both processes were analyzed by means of TG/DTA, XRD, SEM, Atomic Emission Spectroscopy, and FEET method. Studies are presently under way to unravel the basic interaction mechanisms between microwave and alumina power for high rates of alumina extraction from kaolin in the microwave extraction process.

연구발표논문초록 ( 공업화학 (Ⅱ) ) : NiS 난용성 염의 반응 메카니즘 및 중금속 염의 제거율에 관한 연구

신정호 (정),민성기 (정),주창식 (정) ( Jeong Ho Shin,Seong Kee Min,Chang Sik Ju ) 한국화학공학회 1988 춘계학술발표회 Vol.- No.-

ESTHETIC MANDIBULAR ANGLE REDUCTION ; IST USE AND COMPLICATIONS

김창수,엄인웅,민병국,민성기,양윤석,Kim, Chang-Soo,Um, In-Woong,Min, Byoung-Kuk,Min, Seong-Kee,Yang, Yun-Seok Korean Association of Maxillofacial Plastic and Re 1991 Maxillofacial Plastic Reconstructive Surgery Vol.13 No.2

악안면부의 기형은 기능 및 심미적인 매우 중요한 문제이며, 이러한 면에서 현대 악안면 영역의 성형술은 기능 및 사회심리적으로 많은 기여를 한다는 것은 사실이다. 악안면 성형술 중 하악 우각부에 대한 관심은 19 세기 후반부터 교근비대증 (Masseter Hypertrophy)으로 표현되었으며, 안모의 심미적인 영향에 대한 평가는 동양에서 하악골의 변형과 함께 비중있게 다루어지고 있다. 교근비대 또는 협부비대의 원인은 악성 및 양성종물, 악습관에 의한 생리적 비대, 감염, 선천적기형 등이 있을 수 있으나, 환자가 호소하는 주소는 안연의 비대칭 또는 사각형의 안모등이므로 이에 대한 수술의 주된 목적은 심미적인 면이 대부분을 차지한다고 볼 수 있다. 그러므로 안모개선 등 수술 후의 결과에 대한 깊은 관심이 요구되며, 따라서 혈종이나 감염, 하악골 골절, 개구장애 등과 같은 합병증과 후유증에 대한 올바른 이해와 최대한의 예방이 필요할 것으로 사료되어 문헌고찰과 함께 증례보고를 하는 바이다. The bulging of mandibular angle area, frequently, make some difficulties in social life due to its reckless appearence, especially in oriental nations. So, many authors had reported its causes and surgical techniques for correction since late 19th century with diagnosis of masseter hypertrophy. But in spite of its muscular origin, major surgical techniques, in general, should aim complete bony reduction or osteotomy and supplemental myotomy as in hemimandibular hypertrophy or mandibular elongation. We used ultrasonogram for soft tissue depth estimation and expearenced some complications such as incomplete lingual cortical bony reduction, condylar fracture in mandibular angle reduction via intraoral circumvestibular approach. So we reported our surgical technique for angle reduction with possible complications.

실리카 나노입자를 이용한 아미드–이미드 공중합체의 합성과 성질

민준호(Jun Ho Min),박찬영(Chan Young Park),민성기(Seong Kee Min) 한국고분자학회 2016 폴리머 Vol.40 No.6

아미드기가 포함된 개질화된 silica nanoparticle에 폴리이미드 유도체를 3차 아민계 화합물인 1,4-diazabicyclo[2.2.2]octane를 이용하여 공중합하여 합성한 폴리아미드-이미드의 열적 성질 및 물리적 특성을 검토하였다. 단위체 합성(MP, AMP, PA, PAB)과 DABCO를 이용한 중합체의 합성(PAAMP1, PABAMP1)을 EA, FTIR, TGA, XPS, XRD, SEM 등을 통하여 이미드화의 공중합체를 확인하였다. XPS data에서 PAB의 Br(3d)가 68.63 ev에 중합된 것이 확인되었으나 PABAMP1에서는 거의 나타나지 않았고 용매에 대한 용해도 조사에서 공중합체의 강인한 이미드기와 말단 부분의 실록산 세그멘트가 용해도에 영향을 끼쳤으며 극성 용매인 NMP에서 용매화 현상으로 접촉각이 85~88°에서 63~65°로 감소하여 파라-파라 위치의 이미드 공중합체에서도 강한 흡습성을 보이고 있다. Polyamide-imide was prepared through copolymerization polyimide derivative and tertiary amine compound (1,4-diazabicyclo [2.2.2] octane) on modified silica nanoparticles with amide group and thermal and physical characteristics were investigated. Polymer compounds (PAAMP1, PABAMP1) were polymerized with monomer compounds (MP, AMP, PA, PAB) and DABCO and the imidization of polymer was confirmed through EA, FTIR, TGA, XPS, XRD and SEM. The Br(3d) of PAB was polymerized at 68.63 eV but one of PABAMP1 was not, which was found in XPS analysis. Since a tough imide group and siloxane segments of end-group of copolymers had influence on the solubility of solvents and the contact angle of NMP which is a polar solvent decreased from 85-88° to 63-65° owing to solvation. Strong hygroscopicity was found in the imide copolymer of para-para position.

비할로겐형 phosphate계 난연제의 합성 및 특성결정

한영균 ( Young Gyun Han ),민성기 ( Seong Kee Min ),박찬영 ( Chan Young Park ) 한국고무학회 2014 엘라스토머 및 콤포지트 Vol.49 No.4

난연제 가운데 가장 많이 사용되는 할로겐 함유 난연제는 사용상 환경적인 제한을 받고 있어서 비할로겐타입인인계에 기초한 난연제가 각광을 받고 있다. 난연제는 수지에 가해지는 경우에 흔히 열분해와 기계적 특성저하를 일으킨다. 물성의 열화를 최소화하고 충분한 난연성을 얻기 위한 시도로 새로운 난연제에 대한 연구를 수행하였다. 본 연구에있어서는 diaryl alkyl phosphate esters, aromatic phosphate esters 및 phosphonium nitron 난연제 등 세가지형태의 비할로겐 인계에 기초한 난연제를 합성하여 GC, IR 및 TGA 등으로 합성 및 열적 특성을 확인하였다. Among many types of flame retardants, the most available halogen-containing flame retardants were putunder environmental restrictions in their use, so non-halogen type phosphorus-based flame retardants have come into the spotlight. When added to resins, flame retardants commonly bring about thermal degradation and decrease in mechanical properties of resins. Studies of new flame retardants were carried out in an attempt to minimize degradation of physical properties and require enough flame retardancy. In this study, three types of non-halogen phosphorus-based flame retardants were synthesized with diaryl alkyl phosphate esters, aromatic phosphate esters and phosphonium nitron flame retardants, which were then identified for the synthesis and thermal properties by gas chromatography (GC), IR and thermal gravimetric analysis (TGA).