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황치원,황택성,박성규 한국고분자학회 2015 Macromolecular Research Vol.23 No.4
This study involves the synthesis of a phenolic porous LMO (lithium manganese oxide) adsorbent by thepolycondensation method and the preparation of porous LMO microsphere adsorbent with a spinel structure by thecarbonization method. The structure of the porous LMO precursor was confirmed, and the crystalline structure, compressivestrength, BET surface area, morphology, and acid resistance of the porous adsorbent were analyzed byXRD, UTM, BET surface area, and SEM. The crystalline structure of the adsorbent was spinel, and the carbonizedsurface had a wrinkled structure. The specific surface was 97.9-120.0 m2/g, and the compressive strength decreasedto 2.4-9.7 MPa as the LMO content increased. In addition, the adsorbent was stable against acid due to its crosslinkedstructure. In pure solution, the breakthrough of lithium was at over 8 hours, which was more rapid than thatof the onewith LMO powder adsorbent. Moreover, the selective breakthrough of lithium from artificial seawateroccurred after 6 hours, selectivity was very high at greater than 90%, and the desorption rate was faster than that ofthe LMO for the LMO powder adsorbent. As a result, the selective adsorption of lithium from seawater had a higheconomic efficiency.
하악골 각부 및 후위 체부의 골절시 Trocar와 Drill Guide를 이용한 정복
김진,황치원 大韓成形外科學會 1994 Archives of Plastic Surgery Vol.21 No.6
As modern society becomes very complex, there has been steady increase in violence, and automobile and industrial accidents. This has resulted in the increased incidence of facial injuries including mandibular fracture, Many methods have been advocated to achive reestablishment of normal feature and function. The choice generally depends upon such factors as location of the fractures, displacements, status of the dentition and "favorability"of the fracture line. In fixation method, interosseous wiring or righid fixation using miniplate and screws are included. For fractures of the angle and proximal body, as far forward as the premolar region, external submandibular icision was used to approach operation field for reduction and fixation, but there was some problems, such as possibility of marginal mandibular nerve injury, prolonged massive swelling and objectional; scarring. So we used trocar and drill guide for drilling and application of screws in miniplation instead of submandibular incision for open reduction of 12 cases of simple fracures of mandibular angle or posterior body from Aug.1990 to July, 1993, With the results, use of trocar and drill in miniplating has soe advantages such as decrease of possibility of marginal mandibular injury, decrease of blood loss, early subsidence of post operative swelling, minimal extermal scarring. We present our experiences about application of trocar and drill guide for open reduction with intraoral approach for 12 cases of mandibular angle or body fractures, and review other documents.
에폭시 복합수지의 내충격성을 향상을 위한 PPG 기반 우레탄 변성 에폭시 합성 및 특성 분석
황치원,전재희,안도원,유영창,이원주 한국접착및계면학회 2022 접착 및 계면 Vol.23 No.2
Epoxy resin has the disadvantage of being easily destroyed by instantaneous impact due to its high crosslinking density despite its high glass transition temperature (Tg) and excellent properties. To compensate for this, in this study, polyol was synthesized by ring opening polymerization of propylene glycol (PPG) diamine, Jeffamine D 2000 and propylene carbonate, and urethane modified epoxy was synthesized using this. The properties of the synthesized urethane modified epoxy were confirmed by FT-IR, H-NMR. To confirm the degree of improvement in impact resistance as an adhesive, a urethane modified epoxy adhesive was prepared by mixing a digylcidyl ether bisphenol A (DGEBA) with curing agent and curing accelerator. Properties test of urethane modified epoxy were shear strength, tensile strength and impact strength. As a result, excellent results were obtained in all test when the ratio of DGEBA : urethane modified epoxy was 8:2.