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고분자용액의 물성이 수면전개 박막의 두께에 미치는 영향
남석태,한명진,최호상,박영태 ( Suk Tae Nam,Myeong Jin Han,Ho Sang Choi,Young Tae Park ) 한국공업화학회 1998 공업화학 Vol.9 No.2
수면전개법에 의해 제조된 박막의 두께에 대한 고분자용액의 표면장력과 검도의 영향을 검토하였다. 수면에서 고분자용액의 전개는 고분자용액의 표면장력과 점도에 의해 지배되며, 수면전개 박막의 두께도 이들 인자의 영향을 받는다. 고분자의 농도가 증가함에 따라 고분자용액의 표면장력과 점도는 증가하였으며, 표면장력의 크기는 PVC>PS>CA이였고, 점도의 크기는 CA>PS>PVC였다. 고분자용액의 수면전개시 물과 고분자용액의 표면장력의 차는 전개구동력으로 작용하나 고분자용액의 표면장력과 점도는 전개저항으로 작용하였다. 수면전개 박막의 두께에 대한 고분자용액의 점도영향이 표면장력에 의한 영향 보다도 더 컸으며, 수면 전개 박막의 두께는 PS>CA>PVC 순으로 두꺼웠다. The effect of surface tension and viscosity of polymer solution on the thickness of water casting membranes was studied. Spreading of polymer solutions on water surface was governed by the surface tension and viscosity of the polymer solution. Thethickness of water casting membrane was affected by these two factors. The properties, motioned above, were proportional to the polymer concentration. The order of magnitude in surface tension was PVC > PS > CA and that of viscosity was CA > PS > PVC. The difference of surface tension between water and polymer solution acts as driving force for spreading of polymer solution, but the viscosity as resistance. The thickness of polymeric membrane prepared by water casting was PS > CA > PVC. The order of membrane thickness was not as same as that of surface tension. This phenomena were due to the viscosity which acts as more effective spreading resistance than the surface tension.
Cellulose Acetate 막의 기체투과특성에 관한 연구
이수각,박영태,최호상,남석태 경일대학교 산업기술연구소 1994 産業技術硏究所 論文集 Vol.4 No.-
Gas permeation characteristics of cellulose acetate membranes, prepared by different methods as like solvent casting method and water casting method, were examined. In case of solvent casting membranes, permeation rate and the effect of Knudsen flow were increased with increasing the time of solvent evaporation. As increasing the polymer concentration, gas permeability of water casting membranes was decreased while selectivity was increased. The values of water casting membrane, such as permeability and selectivity, was in the range between asymmetrics' and symmetrics' those prepared by solvent casting. The gas permeation mechanism seems to obey the combination Poiseuille and Knudsen model and the solution diffusion model with the variation of polymer concentration and the time of solvent evaporation.
김진호,김재선,김준석,권소영,신상원,이창홍,박영태,김종극,원남희,송관규 대한소화기내시경학회 1993 Clinical Endoscopy Vol.13 No.2
Deposition of amyloid in ststemic amyloidosis may cause widespread dysfunction of the entire gastrointestinal tract, Intestinal pseudoobstruction is an uncommon but well-recognized complication of systemic amyloidosis, and its prognosis is poor and conventional treatment is ineffective. We report a case of intestinal pseudoobstruction secondary to systemic amyloidosis diagnosed by endoscopic mucosal biopsy in a patient with multiple myeloma.