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초임계 탄산가스/유기용매/이색성 염료의 혼합계를 이용한 폴리(비닐 알코올) 편광필름의 제조 및 편광특성
박기상(Ki Sang Park),최이준(E Joon Choi),장진호(Jin Ho Chang),박일현(Il Hyun Park) 한국고분자학회 2011 폴리머 Vol.35 No.5
초임계 탄산가스/유기용매 혼합계 상에서 이색성 염료인 C. I. direct black 22(DB22)로 고검화도의 폴리(비닐 알코올)(PVA)을 염색하여 내구성이 강한 편광필름을 제조하였다. 특히, 초임계 탄산가스 상으로 이색성 염료를 녹이기 위한 분산제로 에틸렌 글리콜과 디메틸 설폭사이드의 무게비=4:6의 혼합용매계를 사용하였을 때 염색 압력을 200 bar까지 낮출 수 있었다. 초임계 유체계의 사용으로, 최대 염색은 연신 전 투과도로 1% 미만까지, 폐수 발생량은 1/10 수준까지, 감소가 가능하였고, 이와 같이 염색된 PVA 필름을 500% 연신한 후 측정된 편광효율은 94%, 평균 투과도(single piece transmittance)는 30%로 각각 얻어졌으며, 또한 이색성 염료로서의 DB22의 한계 및 개선 방안 등도 검토하였다. In the mixed system of supercritical carbon dioxide/organic solvents, poly(vinyl alcohol)(PVA) film of high degree of hydrolysis could be dyed with a dichroic dye of C. I. direct black 22(DB22) and as a result, high durability was obtained. Especially, as a dye dispersant in a supercritical fluid phase, a mixed solvent system of ethylene glycol: dimethyl sulfoxide=4:6 weight ratio was investigated. Then the optimum pressure for dyeing could be reduced down to 200 bar. Using this supercritical fluid system, the maximum dyeing appeared as the transmittance of less than 1% and the waste amount was reduced to the level of 1/10. After 500% drawing of this PVA film, both the polarizing efficiency of 94% and the single piece transmittance of 30% were obtained. The limitation of DB22 and further improvements were also discussed.
인공고관절 비구부 재치환술에 있어서 원추형 비구형 삽입물에 의해 발생된 비구부 골결손의 치료
노성만 ( Sung Man Rowe ),윤택림 ( Taek Rim Yoon ),정성택 ( Sung Taek Jung ),박기상 ( Ki Sang Park ) 대한고관절학회 1996 Hip and Pelvis Vol.8 No.1
Several classifications for the acetabular bone defect in revision surgery have been proposed and the operative method of revision depends on the type of bone deficiency. The truncated type of acetabular prosthesis presents rather unique pattern of acetabular bone defect and accordingly requires a corresponding classifieation and methods of treatment for each type. The purpose of this study is to describe the pattern of acetabular bone defect in loose truncated type of acetabular prosthesis and our method of revision for them. Thirty acetabular revisions of the truncated type were performed in the Dept. of Orthopedics, Chonnam Univ. Hosp. The types of acetabular component in primary surgery were Mittelmeier ceramic cup in 20 patients and Cementless self-cutting titanium(CST) cup in 10 patients. We classified the severity of acetabular bone defect into three categories; mild, moderate, and severe. Mild acetabular bone defect was defined as simple aseptic loosening of the truncated cup with mild or no migration of the acetabular component. Moderate acetabular bone defect was considered as aseptic loosening with moderate proximal and medial migration of the acetabular component causing small medial segmental defect. Severe acetabular bone defect was defined as massive bone defect around the acetabular component including large medial segmental defect. We used the severity of the bone defect as a guide line for the treatment. If acetabular bone defect was mild, standard porous coated hemispherical acetabular component with or without bone graft was satisfactory. If the defect was moderate, the defect was filled with bone graft and standard porous coated hemispherical cup was used. If the bone deficiency was severe, it was reconstructed by massive bone graft and fixation with ARRR(Acetabular roof reinforcement ring) with hook.