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The Steric Repulsion Properties of Polyethylene Oxide
Jeon, Sang Il,Joseph D. Andrade Korean Chemical Society 1992 Bulletin of the Korean Chemical Society Vol.13 No.3
Polyethylene oxide (PEO) surfaces are recognized as having an effective steric stabilization character. A theoretical scaling analysis involves the osmotic and elastic coefficients of the polymer as a function of molecular weight, in a good solvent. The calculated results show that PEO in water may exhibit the greatest flexibility among water soluble polymers, probably due to its lowest elastic contribution.
Theoretical Estimation of Interfacial Tension between Molten Polymers
오영기,전무식,Youngie Oh,Joseph D. Andrade,Mu Shik Jhon Korean Chemical Society 1979 대한화학회지 Vol.23 No.4
특성구조액체이론(significant structure theory of liquids)에 입각하여, 섞이지 않는 두 용융 고분자중에서의 계면장력을 예측하는 간단한 계산방법을 연구하였다. 접착에너지는 응집에너지들의 기하평균과 보정항의 곱으로 표시되며, 응집에너지는 고분자 사슬의 격자상을 가정하므로써 계산된다. 계면장력올 계산함에 있어서 고분자사슬의 구성요소간 분산력(dispersion force) 외에 극성력(poIar force)를 포함시켜야 함이 확인되었다. A simple method to calculate the interfacial tension between two immiscible molten polymers has been developed. The theory is based on the significant structure theory of liquids. The energy of adhesion is expressed as a geometric mean of the cohesion energies multiplied by correction factor $({\Phi}12)$, ${\Delta}E_{12}={\Phi}_{12}\sqrt{{\Delta}E_{11}{\Delta}E_{22^{\circ}}$. In the calculation of ${\Delta}E_{11}\;and\;{\Delta}E_{22}$, a quasilattice of polymer chains has been assumed. It is assured that, besides the dispersion force, the polar force interactions between polymer constituent groups should be considered in the calculation of the interfacial tensions.
반투막을 통한 수화된 이온의 투과속도 탈수화율 및 완화시간에 관한 연구
김무식,이해방,김성완,Kim Mu Shik,Lee Hai Bang,Kim Sung Wan,Joseph D. Andrade 대한화학회 1976 대한화학회지 Vol.20 No.6
간단한 통계역학적 방법을 사용 수화된 이온의 완화시칸, 탈수화시의 활성화, 에너지, 탈수화율 등을 계산하였다. 구상한 model에 의하면 수화된 물과 탈수화된 물 간의 평형상수, 물-이온간 에너지 항, 각종 species 간의 혼합 factor들이 들어있다. 이론과 실험은 잘 맞는 겨로가를 보이고 있다. 또한 이온이 탈수화식의 압력의 영향도 아울러 논의하였다. A simplified statistical mechanical method was developed for the calculation of the dehydration fraction, activation free energy of dehydration, and the relaxation times of hydrated ions. The model used includes the equilibrium constant between hydrated and dehydrated water, a water-ion interaction potential energy term, and a mixing factor for the species present. The agreement between theory and experiment is good. The pressure dependence of ion dehydration is also discussed.