高分子多孔膜の構造形成のシミュレーション(<小特集>膜のシミュレーション)
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概要
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Performance of a membrane will be governed by pore characteristics and supermolecular structure, which are formed through phase separation phenomena of casting solutions, and the phase separation is controlled by the casting conditions. The basic tenet of formation of porous polymeric membrane by phase separation method is particle growth concept. With an aid of computer simulation technique, an attempt was made 1) to clarify a general principal describing the steps of nucleation to the growth of the primary particles, 2) to establish a theory on particle growth from the primary particle to the secondary particle, 3) to develop a theory of pore characteristics of pore size distribution N(r), and 4) to investigate the process of forming membranes structure. According to "local equilibrium hypothesis, " when the phase separation of whole system is attained, all the nuclei are defined as the primary particles. Particle simulation by Monte Carlo method reveals that the growth rate of particles is expected to be larger when the phase separation occurs under the conditions of lower concentration of polymer-lean phase and of smaller two phase volume ratio R. Collapse of a hypothetical gel membrane during coagulation process explains well the finding that theoretical N(r) coincides fairly well with that of an actual membrane only when apparent phase volume ratio is employed. Computer experiments on membrane formation by Monte Carlo method can reproduce the morphology of actual membrane.
- 日本シミュレーション学会の論文
- 1995-06-15
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