Mechanism of Membrane Formation of Ethylene-Vinyl Alcohol Copolymer Ultrathin Membrane Spread on Water

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  • 水面展開法によるエチレン‐ビニルアルコール共重合体薄膜の製膜機構
  • スイメン テンカイホウ ニ ヨル エチレン ビニルアルコール キョウジュウゴウ

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Description

Mechanism of membrane formation of ethylene-vinylalcohol copolymer (EVA) spread on water was investigated from the viewpoint of diffusibility of spreading solvent. In the case of N, N-dimethylacetamide as spreading solvent, which has high diffusion rate, gelation of polymer solution occured immediatly after sprea-ding. The relatively dense ultrathin membrane was obtained. On the other hand, in the case of H2O/IPA mixed solution as spreading solvent, which has low diffusion rate, the coagulation of polymer grew up and then the gelation occurred. Therefore, a relatively porous ultrathin membrane was obtained. On addition of LiCl into turbid EVA-N, N-dimethylacetamide solution, partial hydrogen bonding association of EVA was destroyed and the solution became clear. When a membrane was formed from the above clear solution, the uniformity of the ultrathin membrane was advanced and the rejection of the membrane increased.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 41 (2), 77-82, 1984

    The Society of Polymer Science, Japan

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