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TiO2 필러를 포함하는 PEO/PMMA 고분자 복합체 전해질의 이온전도도 및 결정화도
이륜규 ( Lyung Yu Lee ),박수진 ( Soo Jin Park ),김석 ( Seok Kim ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.6
본 연구에서는 poly(ethylene oxide) (PEO)와 poly(methyl methacrylate) (PMMA) 블렌드를 고분자 매트릭스(matrix)로 사용하고, 가소제로propylene carbonate (PC), 리튬염인 LiClO4, 그리고 서로 다른 함량의 세라믹 필러인 TiO2를 이용하여 용액 캐스팅(solution casting)법에 의해 고분자 복합체 전해질 필름을 제조하였다. 고분자 전해질의 결정화도와 이온전도도는 각각, X선 회절분석기(XRD)와 AC임피던스법을 통해 분석하였고, 표면 형태학(morphology)을 조사하기 위해 주사전자현미경(SEM)으로 고찰하였다. 그 결과, TiO2의 함량을 증가시킴으로써 PEO의 결정화 영역이 감소하였고, 이온전도도는 증가하였다. 특히 TiO2의 함량이 15 wt%일 때 가장 높은 이온전도도가 관찰된 반면, 15 wt% 이상을 첨가한 경우, 이온전도도가 감소된 경향을 관찰할 수 있었다. 이는 표면 형태학를 통해 고분자와 필러간의 비혼합성 혹은 필러응집에 의해 불균일적인 형태학이 나타남으로써 이온전도도가 감소하는 현상을 확인할 수 있었다. In this work, polymer composite electrolytes were prepared by a blend of pol (methyl methacrylate)(PMMA) and poly(ethylene oxide) (PEO) as a polymer matrix, propylene carbonate as a plasticizer, LiClO4 as a salt, and by containing a different content of TiO2, by using the solution casting method. The crystallinity and ionic conductivity of the polymer electrolytes was evaluated using X-ray diffraction(XRD) and AC impedance method, respectively. The morphology of composite electrolyte film was analyzed by SEM method. From the experimental results, by increasing the TiO2 content, crystallinity of PEO was reduced, and ionic conductivity was increased. In particular, the ionic conductivity was dependent on the content of TiO2 and showed the highest value 15 wt%. However, when TiO2 content exceeds 15 wt%, the ionic conductivity was decreased. According to the surface morphology, the ionic conductivity was decreased because the polymer composite electrolytes showed a heterogenous morphology of fillers due to immiscibility or aggregation of the filler within the polymer matrix.
혈액투석 환자의 동정맥루 천자 시 통증완화를 위한 온요법과 냉요법의 효과
최송희,백경희,이정영,임현빈,김현정,김윤수,이륜규,권용은 병원간호사회 2006 임상간호연구 Vol.12 No.1
Purpose: The purpose of this study is to examine the effect of warm and ice application verified to reduce the pain caused by arteriovenous fistula needling under hemodialysis. Method: This study was performed with the one group pretest-posttest design from pre-experimental design. A total of 34 patients who have matured arteriovenous fistula were given an objective pain score, subjective pain score(VAS) and physiologic index respectively 5 times pre-experiment, post warm application and post ice application. The data were analyzed with SPSS win 12.0 program by using descriptive statistics, a repeated measure ANOVA and a paired t-test. Result: The post treatment of warm and ice application reduced the subjective and objective pain rather than pre-treatment when they experienced arteriovenous fistula needling. Concerning the effect of warm and ice application, there turned out to be no significant difference in pain score. Regarding warm and ice application, the hypothesis that physiologic index, such as blood pressure and pulse, was not significantly different between pre needling and post needling and it was partially verified. Conclusion: The findings suggest that both of warm and ice application were effective ways to relieve pain. Therefore, according to characteristic and tendency of patients, it can be recommended to choose warm or ice application
혼합물 실험계획과 다수 반응변수 최적화를 통한 속경화 초저온접착제 개발 사례
변재현 ( Jai Hyun Byun ),서판석 ( Pan Seok Seo ),신지은 ( Ji Eun Shin ),이륜규 ( Lyun Gyu Lee ),염지현 ( Ji Hyun Yeom ) 한국품질경영학회 2014 품질경영학회지 Vol.42 No.4
Purpose: In this paper we present a case study of developing fast curing adhesives for insulation material of LNG carriers using an extreme vertices design with four mixture components. Three material properties are considered . shear strength, viscosity, and tensile strength. In the optimization experiment, we used hardness instead of tensile strength due to shortage of specimens. Methods: We employ four-factor extreme vertices design with 19 runs and desirability function approach for simultaneously optimizing three responses. After selecting optimal condition of the mixture components, we do confirmation experiments to verify the reproducibility of the optimal condition under manufacturing circumstance. Results: Simultaneous optimal condition for the three responses, that is, shear strength, viscosity, and harness is obtained. At the optimal condition, confirmation experiments are executed in manufacturing circumstance. The variation for the shear strength is not satisfactory, which is due to the variation of the humidity. Conclusion: At the optimal condition three material properties are satisfactory. To reduce the variability for the shear strength, robust design is needed.