Atactic Polypropylene에 대한 염회비닐의 그라프트 중합

황택성,민병철,맹기석 忠南大學校 産業技術硏究所 1987 산업기술연구논문집 Vol.2 No.2

Atactic Polypropylene, a byproduct obtained in the manufacture of isotatic polypropylene, has been synthesed under various reaction conditions. In this study, suspension graft polymerizations of Vinylchloride onto Atatic polypropylene were carried out in aqueous with benzoyl peroxide as initiator. The effect on the grafting efficiency and reaction rate was observed by varing APP concentration Also, reactivity onto each hydrogen is the most good tertiary hydrogen among primary, secondary and tertiary. If the vinyl chloride concentration contains small in the polymerization, graftmer have carbonyl group, abnomal structure.

폐 FRP/Urethane Foam 충진 혼성복합재의 제조 및 기계적 물성에 관한 연구

황택성,신경섭,박진원 공주대학교 자원재활용신소재지역협력센터 2000 2차년도 센터 사업 성과집 Vol.2000 No.1

욕조 생산시 발생하는 폐 FRP와 냉장고 등 가전품과 폐단열재로부터 발생하는 폐우레탄폼을 흡음 및 경량판재로 재활용하기 위하여 불포화 폴리에스테르 매트릭스 수지에 보강하여 복합재를 제조하였다. 또한 충진재의 함량의 변화가 복합재의 기계적 물성에 미치는 영향과 기지와 보강재간의 계면현상을 관찰하였다. 충진제의 함량이 70 wt%인 복합재의 인장강도는 82.34MPa로 가장 우수하였으며, 인장탄성율은 보강재의 함량이 증가함에 따라 감소하였다. 또한 굴곡강도와 굴곡탄성율은 폐FRP의 함량이 70wt% 충진된 복합재가 가장 우수하였으며, 그 값은 각각 72.5, 958.4MPa이었다. SEM 관찰 결과 70 wt% 충진된 충진제 매트릭스 수지의 계면에서 pull out 현상이 확인되지 않았으며 균열도 발생하지 않았고, 매트릭스 수지내에 충진된 폐 FRP/우레탄폼 충진제가 잘 분산되어 있음을 확인할 수 있었다. The waste FRP oocured in the fabrication of SMC (sheet molding campound) bathtubs and the waste polyurethane foam occured in electronic manufacture and waste insulator were applied as a soundproof and light weight pannel in the waste FRP unsaturated polyester matrix resin composites to recycle. The effect of filler contents of the mechanical properties and interfacial phenomena of the filler and matrix on the composites was evaluated. The tensile strength of composites reached its maximum value of 82.34 MPa when the filler content was 70 wt%, and the more content of reinforcement is increased, the more tensile modulus was decreased. The flexural strength and modulus of csomposites, reinforced 70 wt% with filler content, were dominant compared to the other samples to 72.5 Mpa, 958.4 MPa respectively. When composite of reinforced 70 wt% with filler content, it was confirmed that pull out phenomena and cracks did not occur in the interface of reinforcement and matrix resin through the SEM observation. Also, waste FRP and urethane foam were dispersed well into matrix resin as filler.

에틸렌 염회비닐 공중합체의 열분해 특성연구

황택성,서정목,맹기석,송해영 忠南大學校 産業技術硏究所 1987 산업기술연구논문집 Vol.2 No.2

PVC has been developed very rapidly as one of general useful resins, and many scientists have studied complimentary method for thermal stability to improve the disadventages of PVC. This study investigated to promote thermal stability by a VC-Ethylene copolymer synthesis of copolymer syntheses. The effect of the thermal stability was studies with different portion of Ethylene-VC copolymer. As the result, when ethylene copolymer was introduced, the thermal stability was promoted. So this report described the process and the result for such analysis.

폐 FRP/석분슬러지 충전 복합재의 제조 및 기계적 물성에 관한 연구

황택성,박진원,이철호 공주대학교 자원재활용신소재지역협력센터 2000 2차년도 센터 사업 성과집 Vol.2000 No.1

SMC 욕조 생산 시 발생하는 폐 FRP와 석재 가공공정에서 발생되는 석분슬러지를 재활용하기 위하여 불포화에스테르 매트릭스 수지에 분말 충전하여 복합재를 제조하였다. 또한 충전제와 매트릭스 간의 계면결합력을 향상시키기 의해 석분을 실란 커플링제 γ-methacryloxypropyltrime-thoxysilane (γ-MPS)로 전처리하여 복합재를 제조하고 기계적 물성 및 계면현상을 관찰하였다. 복합재의 굴곡탄성율은 석분함량이 10 wt%, 실란커플링제의 농도가 3 wt%일 때 가장 우수하였으며 석분 충전량이 증가함에 따라 감소하는 경향을 보였다. 또한 복합재의 초기 열분해온도는 352∼359 ℃이었으며 이 온도에서 중량감소율은 약 3%로 충전제의 양에 관계없이 거의 일정한 경향을 보였다. γ-MPS 처리에 따른 복합재의 물성변화를 관찰한 결과 충전제와 매트릭스 수지간 계면결합력인 증진되어 물리·화학적으로 안정한 결합을 이루고 있고 pull out현상이 발생하지 않음을 확인할 수 있었다 In order to recyle the FRP waste from SMC bathtubs and rock-crush sludge obtained as a byproduct of stones, the composite consisting of the FRP and rock-crush sludge and the unsaturated polyester matrix resin were prepared. To enhance the interfacial bonding force between the reinforcements and the matrix resin, the rock-crush sludge was treated with silane coupling agent, γ-methacryloxypropyltrimethoxysilane (γ-MPS ) and their mechanical properties and interface phenomena were examined. The flexural moduius of the composite containing 10 wt% rock-crush powder treated with 3 wt% silane coupling agent showed the maximum value. And also the initial thermal degradation temperature of composites were in the range of 352∼359℃. From these results, we observed that the weight loss of composites was almost constant regardless of the concentration of silane coupling agent. It is confirmed that the interface of the composites containing filler treated with γ-MPS was improved in that were were no pull-out phenomena between the reinforcement and matrix resin.

콘크리트-폴리머 복합재료 개발(Ⅱ) : Physical Properties of Polymer(Resin) Concrete 폴리머(레진) 콘크리트의 물성

황의환,길덕수,황택성 공주대학교 자원재활용 신소재 연구센터 1999 1차년도 센터 성과집 Vol.1999 No.-

고기능성 건설재료로 활용하기 위하여 불포화폴리에스테르수지를 사용한 폴리머 콘크리트의 물성에 대하여 조사하였다. 탄산칼슘(충전제)의 첨가량(5~20 wt %)과 세골재의 첨가량(10~50 wt %)에 따라 다양한 공시체를 제작하여 압축 및 휨강도, 흡수시험, 내열수성시험, 내산성시험, 세공분포측정 및 SEM에 의한 미세조직 관찰등을 실시하였다. 그 결과 폴리머 콘크리트의 압축강도와 휨강도는 시멘트 콘크리트보다 4배 정도 향상되었고 흡수율은 1/100로 가소되었으며, 내산성시험에 의한 중량감소율은 1/27로 현저히 감소되었다. 내열수성시험후에 측정한 폴리머 콘크리트의 압축 및 휨강도는 모두 내열수성시험전에 측정한 강도에 비하여 67%, 47%로 각각 감소되었으며 폴리머결합체의 분해에 의하여 세공율은 크게 증가되었다. The phsical properties of polymer concrete were investigated for development of high performance construction materials. Various specimens of polymer concrete were prepared using unsaturated polyester resin as the ploymer binder with the various dosge of clcium carbonate as microfiller (5~20 wt %) and fine aggregate(10-50%). For the evaluation of the physical properties of polymer concretes, tests such as compressive strength, flexural stength, water absorption test, hot water immersion test, acid resistance test and pore size distribution analysis were conducted. As a result, it is concouded that compressive and flexural strengths of ployemr concretes increased up to 4times than those of conventional cement concrete. Whereas the compressive and flexural strengths of polymer concretes tested after hot water immersion, compared volume and porosity(%) of polymer concretes were remarkably increased due to decomposition of polymer binder. And also, it is showed that water absorption(%) and weight loss(%) of polymer concrete specimens by acid immersion, compared with those of ordinary portland cement cocrete decreased about 1/100, 1/27, respectively.

PVC부분환원에 의한 Ethylene-Vinylchloride 공중합체의 합성과 열특성

황태성,맹기석,구철회 忠南大學校 産業技術硏究所 1994 산업기술연구논문집 Vol.9 No.1

ST-DVB 공중합체에 tinhydride를 고정한 환원제로 PVC를 부분환원하여 EV copolymer를 합성하였다. 환원제와 EV copolymer의 구조를 FT-IR 분광법으로 확인하였으며, EV copolymer의 조성변화, Tg, 분자량 및 열안정성 등을 조사하였다. EV copolymer의 수율은 32%∼57%이었고, 평균분자량은 3 mole% DVB를 함유한 polymeric hydride 환원제를 사용한 반응의 경우 1.41x10⁴∼1.65x10⁴이었고, 5mole% DVB polymeric hydride 환원제 반응의 경우에는 1.61x10⁴∼1.68x10⁴이었다. 환원제량의 증가에 따라 EV copolymer내의 ethylene unit의 mole%는 증가하였으며, 최대 23.74 mole%이었고 3 mole% DVB를 함유한 polymeric hydride 환원제가 환원력이 더 우수하였다. DSC 분석결과 EV 공중합체의 Tg는 ethylene unit의 조성에 따라 2∼3개로 나타났으며, 높은 쪽의 Tg는 PVC의 Tg와 비슷하게 나타나는 것으로 보아 공중합체 내에 상당 부분의 PVC가 존재하고, 구조가 불균일함을 알 수 있었다. 또한 공중합체내의 ethylene unit mole%가 19.8 mole% 이상에서는 3개의 Tg가 나타났으며 이런 결과로부터 공중합체는 block 형태임을 확인할 수 있었다. 초기 열분해 온도는 240∼248℃로 PVC보다 모두 높았고, ethylene unit의 조성이 증가할수록 증가하는 것으로 보아 새로운 polymeric hydride에 의해 합성한 EV copolymer의 열안정성은 PVC의 부분 환원제로 적합함을 알 수 있었다. The ethylene-vinylchoride copolymers(EV copolymer) were synthesized by partial reduction of PVC using the ST-DVB copolymer supported organotin hydride as a reduction agent. The basic structures of EV copolymer and reduction agents were studied by FT-IR spectroscopy, and the mole ratio, the glass transition temperature(Tg), the molecular weight, and the thermal stability of copolymer were investigated. The yield of EV copolymer reached about 32-57 percent. Weight average of molecular weight(Mw) of EV copolymer ranged from 1.41∼1.65x10⁴to 1.61∼1.68x10⁴, measured by gel permeation chromatography(GPC) when 3 mole% and 5 mole% of divinylbenzene(DVB) were involved in reduction agent. Ethylene unit of EV copolymer was increased with increasing in the amount of reduction agent used in the partial reduction of PVC, and their molar content reached a maximum of 23.74 mole% when 3 mole% DVB involved reduction agent was used. Differential scanning calorimetry(DSC) experiments were performed on a series of EV copolymer for the purpose of studying the dependence of their thermal transition temperature upon their values were lower than that of homo PVC. On the other hand, it was found that there were three Tg when the ethylene unit in EV copolymer is above 19.84 mole%. This may indicate that EV copolymer has a structure of block copolymer. Initial thermal degradation temperature of EV copolymer was higher than by thermal gravimetry(TGA). From this result, it was found that thermal stability of EV copolymer by partial reduction of PVC using 3 mole%, 5 mole% reduction agents were increased with increasing in the amount of ethylene unit content in the copolymer.

포괄수가지불제도 적용에 따른 산부인과 진료수입의 변화

황태연,유병철,정귀언,정수진,김성준,배기택,손혜숙,이종태,전진호,엄상화 인제대학교 2001 仁濟醫學 Vol.22 No.1

Objectives: Under the fee-for-service system, Korean hospitals have been suffering from the worsening profitability caused by law medical care fees. To overcome the difficulties, they have maximized the quantity of medical services and made relatively large investment in developing new medical services using high-priced medical equipment, medicines and medical supplies which were not covered by medical insurance system rather than reduced running costs. Materials and Methods: This study was made to analyze and forecast the revenue change of the department of Obstetrics and gynecology of an university hospital in Seoul, expecting the implementation of DRG system in 2000. Results: The results were as follows : 1.During the first two days of hospitalization. 41% of total medical service fee was occurred, which was thought that most of the check-ups and operations were made during this period. After two days of hospitalization, the new occurrence of medical service fee tended to reduce. 2.Out of total medical service fee, 67% of admission fee was occurred after 5 days of hospitalization. This was because medical service fees in obstetrics and gynecology department occurred during the first 5 days of hospitalization. 3.Out of fees for operation, treatment, medical supplies and blood transfusion. 71% was occurred during the first two days. 4. In case of fees for examination, 50% was occurred during the first two days. 5.A total of 53% of fees for medication and injection was occurred during the first 5 days. Conclusions: By the implementation of the DRG system, the income is forecast to increase by 800 won to 310,000 won by the disease group of obstetrics and gynecology department. To increase hospital income with the implementation of DRG system, the results of this study suggest that examinations should be done at out-patient departments before the hospitalization of patient, the discharge of patient should be noticed in advance to reduce the period of hospitalization, and admission appointment system should be implemented for the immediate operation and delivery.

치질에 대한 상아질 접착제의 접합도에 관한 연구

황호길,조영곤,박성택 大韓齒科保存學會 1995 Restorative Dentistry & Endodontics Vol.20 No.2

폐타이어칩 보강 복합재의 제조와 결합재가 복합재의 기계적 물성에 미치는 영향

황택성,박진원 공주대학교 자원재활용신소재지역협력센터 2000 2차년도 센터 사업 성과집 Vol.2000 No.1

For the superior properties of mechanical and thermal aging, this investigation was carried out to develop the recycled of waste tire using various binders (Olefin, SBR Rubber, Polyurethane) for the reuse of the waste tire. In the experimental results show that the mechanical and the thermal aging properties of the composites decreased steadily with increasing content of the waste rubber. We obtained the excellent mechanical and thermal properties when the SBR which is a rubber adhesive was used. Because that total pore area was largen, interfacial adhesive force was weaken. And as the binder was dispersed in waste rubber, the mechanical and thermal aging properties were superior. This result was observed the same phenomena with morphologically.

뮬라이트 결합 캐스터블 내화물의 부피안정성과 유동성

김상모,신현택,황규홍 慶尙大學校生産技術硏究所 1997 生産技術硏究所論文集 Vol.13 No.-

Recently there has been an increased demand for monolithic refractories. Among these Monolithic refractories castable are in particularly widely used because of their easy application to almost any kind of works. In this study the densification and volume stability of high alumina castable refractories was estimated as a function of aggregate size and composition, the amount of matrix phases, and their compositions. It was found that the particle size distribution equation given by Anderassen could be used for predicting the flowability of a castable with good agreement. The addition of microsilica and/or ultrafine-alumina decreased q-vale of Andreassen equation and resulted in better flowability of castables. Andalusite was substituted instead of fine alumina powder in the matrix for better volume stability. Despite of it's good ability for the mullite formation in the matrix, some ultrafine alumina should be added for preventing overfiring and bloating at high temperature. So castables with microsilica and ultrafine-alumina addition to matrix showed good workability and good resistance to large expansion at high temperature.