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      • 抑制劑의 황산칼슘 Scale形成에 對한 反應工學的 고찰

        孫太源 弘益大學校 1981 弘大論叢 Vol.13 No.-

        The kinetics of crystallization of calcium sulfate dihydrate seed crystal in supersaturated solution has been studied at 60℃ in the presence of EDTA (ethylene diaminetetra acetic acid) and ENTMP (ethylene diamine tetrra methylene phosphonic acid). The addition of EDTA gives small effect whereas ENTMP markedly retards the rate of crystallization. From the results of the electrochemical mesurements and the weight loss measurement, these additives are effective not lnly in inbibiting the formation of new scale, but also in removing the existing scale. It was postulated that adsorbed polymer molecules acted as immobile film on the crystal surface and base metal, reducing the step velocity and therefore the formation rate of scale. 1. 序 論 2. Scale 생성 억제 3. Scale 제거 및 방식능력 (a) 전기 화학적 실험 (b) 무게 감량에 의한 실험 4. 結 論 The kinetics of crystallization of calcium sulfate dihydrate seed crystal in supersaturated solution has been studied at 60℃ in the presence of EDTA (ethylene diaminetetra acetic acid) and ENTMP (ethylene diamine tetrra methylene phosphonic acid). The addition of EDTA gives small effect whereas ENTMP markedly retards the rate of crystallization. From the results of the electrochemical mesurements and the weight loss measurement, these additives are effective not lnly in inbibiting the formation of new scale, but also in removing the existing scale. It was postulated that adsorbed polymer molecules acted as immobile film on the crystal surface and base metal, reducing the step velocity and therefore the formation rate of scale.

      • KCI등재

        고농도 키토산 처리에 의한 셀룰로오스 직물의 기능성 향상

        손태원,전영민,정민기,김민조,임학상 한국섬유공학회 2003 한국섬유공학회지 Vol.40 No.3

        Several cellulosic fabrics such as cotton(plain and jacquard), rayon(plain) and Tencel(twill) are treated with relatively high-concentrated chitosan solution by padding and printing methods. The treated fabrics, both by padding and printing, must have more than 0.5 wt% of add-on of chitosan to get at least 90% bacteriostatic ratio. The moisture regain and deodorization ratio increase with increasing add-on of chitosan, but static charge decreases. These properties occur irrespective of the chitosan treatment method and variety of fabrics. However. air permeability is strongly dependent on the treatment method. In the case of padding process, air permeability increases with increasing chitosan content, but the air permeability of cellulose fabrics treated by printing process decreases with increasing chitosan content. When cellulose fabrics are dyed, dye exhaustion and shade depth increase with increasing add-on of chitosan. Also. cellulose fabrics treated with chitosan have superior colorfastness compared with untreated cellulose fabrics. Especially, cellulose fabrics treated by printing method have excellent colorfastness compared with the padding method.

      • KCI우수등재

        유연쇄를 사용한 개질 폴리에스터 공중합체의 제조와 그 특성(I)-BHPP [2,2-bis(4-(2-hydroxyethoxy)phenyl)] Propane-

        손태원,박광현,조진원,김영훈,최용혁 한국섬유공학회 2004 한국섬유공학회지 Vol.41 No.3

        Poly(ethylene terephthalate)(PET) was chemically modified through copolymerization of bis(2-hydroxyethyl) terephthalate (BHET) and 2,2-bis(4-(2-hydroxyethoxy) phenyl) propane (BHPP) as a flexible chain moiety to enhance high-speed spinnability by retarding the stress-induced crystallization during spinning. The properties of the copolyester were investigated using GPC, DSC(differential scanning calorimetry), TGA(thermogravimetry analysis), and proton-NMR. From the result of GPC, it was found that the copolyesters had higher molecular weight and narrower molecular weight distribution than those of PET obtained from BHET only. Non-isothermal crystallization measurement showed that $T_{cm}$ (melt-crystallization temperature) decreased and $T_{cc}$ (cold crystallization temperature) increased with increasing amount of comonomer. It seems that the rate of crystallization of copolymer might be retarded during melt-spinning. Isothermal melt-crystallization measurement suggested that the rate of crystallization was lowered and Avrami index decreased with increasing amount of comonomer. However, incorporation of the comonomer did not affect the crystal structure of PET.

      • KCI등재

        부분 배향된 Poly(trimethylene terephthalate)(PTT) 섬유의 시간에 따른 특성

        손태원,김남훈,정민기,김영훈,김대선 한국섬유공학회 2003 한국섬유공학회지 Vol.40 No.3

        Time dependence of several properties such as mechanical, thermal, and structural properties of partially oriented PTT filaments was investigated. PTT was spun on a extruder and drawn to draw ratios 1.5, 2.0, 2.5 and 3.0, and the time-dependence of the properties of samples with different draw ratios was measured for a month. At lower draw ratio, it was found that the glass transition temperature increases and the endothermic peak by molecular relaxation occurs in the glass transition region with increasing ageing time. Similarly, the birefringence decreases with increasing ageing time at lower draw ratios. But for the PTT POY with a high draw ratio of about 3.0, the mechanical properties, birefringence, and thermal properties did not change with ageing time. It suggests that fiber structure of PTT POY can be stabilized at this draw ratio. Based on these result, it was concluded that the fiber structure of PTT POY could be stabilized if it is drawn lip to about DR 3.0.

      • KCI우수등재

        극성고분자를 첨가한 폴리프로필렌(I) -구호와 특성 -

        손태원,김학묵,김영훈,이남순,전옥화 한국섬유공학회 2002 한국섬유공학회지 Vol.39 No.2

        In order to develop dyeable polypropylene fibers, polypropylene-polar polymer blends and their blend fibers, which were prepared via melt blending of polypropylene(PP) with ethylene-vinyl acetate copolymer containing 28 wt% of vinyl acetate(EYA(28)) and 38 wt% of vinyl acetate (EVA(38)) and phenolic resin novolac (PRN), at various compositions, were studied. Solubility parameter, thermal property, flow behavior. mechanical property, morphology, and miscibility of the blends were investigated. The blends of PP/EVA(28) exhibited enough compatibility to give a blend having no clear phase seperation and had excellent fiber forming ability. It was found that additive polymers could be dispersed without phase separation in the order of EVA(28) > EVA(38) > PRN and they affected the mechanical properties of PP. PP/EVA(38) and PP/PRN blends showed considerable decrease in flow and mechanical properties compared to those of pure PP. But PP/EVA(28) blends did not show property.

      • KCI우수등재

        극성고분자를 첨가한 폴리프로필렌(II) -섬유의 제호와 특성 -

        손태원,김학묵,정민기,이남순,전옥화 한국섬유공학회 2002 한국섬유공학회지 Vol.39 No.2

        In order to develop dyeable polypropylene fibers, polypropylene-polar polymer blends and their blend fibers, which were prepared via melt blending of polypropylene(PP) with ethylene-vinyl acetate copolymer containing 28 wt% of vinyl acetate (E77(28)) and 38 wt% of vinyl acetate (EVA(38)) and phenolic resin novolac (PRN), at various compositions, were studied. Crystallite size, orientation, and dynamic mechanical properties of the blend fibers were investigated. Apparent dye adsorption (K/S value) and dyeing fastness were measured. Especially PP/EVA(28) blend fiber exhibited mechanical properties as high as those of PP fibers. K/S values were increased with increasing EVA content up to 7 wt% dependent on the chemical structure of dyes. Red dye was adsorbed much more than blue and yellow dyes due to the affinity between dye and fibers. Washing and light fastness was excellent and comparable to polyester.

      • KCI등재

        돌출부를 지닌 전극의 전기도금시스템에 대한 이론적 이차 전류분포 해석

        손태원,주재백,Sohn, Tai-Won,Ju, Jeh-Beck 한국전기화학회 2009 한국전기화학회지 Vol.12 No.4

        돌출부를 지니고 있는 전극의 전기도금 공정에 대한 이론적 이차 전류분포에 대하여 고찰하였다. 전극이 모두 전도체인 경우(Case 1)와 돌출부위만 전도체인 경우(Case 2) 두 가지 경우에 대하여 인가전위, 이온교환 전류밀도와 용액의 비전도도의 비인 $\xi$값, aspect ratio의 영향 등에 대하여 살펴보았다. 그 결과 인가 전위와 $\xi$값이 증가할수록 전류분포는 불균등화가 심화됨을 알 수 있었다. Aspect ratio가 작아질수록 전류분포가 보다 균등화되며 Case 2의 경우가 Case 1의 경우 보다 균등도가 좋아짐을 알 수 있었다. 돌출부위가 다양한 모양으로 이루진 전극에 대해서도 이 모델을 적용한 결과 전극 표면에 따른 국부 전류분포를 동시에 계산할 수 있음을 알 수 있었고 이 경우에도 이전과 마찬가지로 $\xi$값이 감소할수록 전류분포의 균등도가 좋아짐을 알 수 있었다. Theoretical calculations for the secondary current distributions for the electrode with a projection part in electroplating were performed. Two kinds of electrodes were considered. One is a electrode with the overall conducting surfaces(Case 1) and the other is an electrode in which only a projection part has a conducting surface(Case 2). The effects of applied potential, the ratio of ion exchange current to conductivity, $\xi$ and the aspect ratio on the current distribution were examined. The increase of applied current or the value of $\xi$ decreased the uniformity of current distribution. The small value of aspect ratio resulted the more uniform current distribution and Case 2 showed the better uniformity than Case 2. When this model was applied into an electrode with various projection parts, the local current distribution along the electrode surface were obtained successfully. In this case, the decrease of $\xi$ also increase the uniformity of current distribution as seen previously.

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