酢酸セルロース溶液からの多孔膜形成機構

DOI Web Site 被引用文献12件

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タイトル別名
  • Membrane Forming Process from Cellulose Acetate Solutions
  • サクサン セルロース ヨウエキ カラ ノ タコウ マク ケイセイ キコウ

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抄録

Porous cellulose acetate (I) membrane having a pore opening diameter of 0.01-10 μm and a porosity of 30-85% was prepared by casting a mixture of I having an acetyl content of 54.1%, a metal salt, a good solvent for I, and a poor solvent for I. The metal salt in the film was removed subsequently by dissolving the salt. The metal salt added to the solution plays the following roles: (1) increase the pore density and (2) yield a membrane with round pores at either surface. The fundamental phase-separation characteristics in the membrane forming process were studied systematically by chemical analysis together with microscopic observation. Particles, having a diameter of about 0.05 μm, of a polymer-rich phase, which appeared during the evaporation of solvent, amalgamate in part straightforwardly into a continuous phase (case A) or grow up (ca 2 μm) partly to contact with each other (case B). In subsequent processes of further solvent evaporation, washing and drying, in the case A the continued polymer-rich phase contracts volumetrically, yielding opening pores and in the case B crevice among the grown-up particles becomes opening pores. The occurrence of either case A or case B depends essentially on the composition of solution at the stage that the phase separation starts.

収録刊行物

  • 高分子論文集

    高分子論文集 34 (3), 205-216, 1977

    公益社団法人 高分子学会

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