可塑剤含有繊維素誘導体膜中の湿気拡散(高分子物質の湿気拡散)

概要

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Water vapour permeability constants of plasticized cellulose nitrate, ethyl cellulose and cellulose acetate depend on the permeability constant and the content of plasticizer. In the range of x=0.2〜0.3, where x is the weight fraction of plastizer, there appears a minimum point of the permeability constant in almost all plasticized cellulose derivatives. The reason why the minimum point appears is understood by separating the permeability constant into the solubility constant and the diffusion constant according to P=D・S. In the cellulose nitratedioctyl phthalate system, in which cellulose nitrate has larger solubility constant and smaller diffusion constant than dioctyl phthalate, the solubility constant decreases non linearly with the content of plasticizer and the diffusion constant increases slowly until about x=0.5 and steeply beyond that point. A similar feature is found in the ethyl cellulose-tricresyl phosphate stystem.
宇宙航空研究開発機構の論文
1958-03-05