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指数拡散式について On the Exponential Diffusion Equation Kaneko, Katsumasa Takekawa, Shunji 50019741 Hosokawa, Yukio 40019716 Ishida, Shinichiro 金子, 曾政 竹川, 俊二 50019741 細川, 幸雄 40019716 石田, 真一郎 In an earlier paper, we proposed an exponential diffusion equation of wide application for the diffusion coefficient with concentration dependency : D=D。exp (AC-BC²)， and suggested that the concentration coefficient A and B should relate to the second virial coefficient derivative Γ₂ and the concentration coefficient of sedimentation coefficient kₛ. The relations between characteristics of diffusion curves and A or B can be gained by means of computer with satisfactory accuracy. In case of general polymer solutions which give positive skewness, A is positive or near zero and B is negative. Such as the regenerated cellulose from over-aged alkali cellulose gives nearly equal value of positive A and B, which results kurtosis smaller than 3. Plolymolecularity inclines both A and B to the negative side. In any way, it seems that each polymer has its individual region Γ₂/kₛ values and we can easily show it on the (A, B) coordinates. 1979-03-25 金沢大学工学部 = Faculty of Technology Kanazawa University 1979-03-25 2017-10-03 jpn departmental bulletin paper VoR https://doi.org/10.24517/00011718 http://hdl.handle.net/2297/25558 https://kanazawa-u.repo.nii.ac.jp/records/11731 10.24517/00011718 AN00044309 0022-832X 金沢大学工学部紀要 = Memoirs of the Faculty of Technology Kanazawa University 12 1 111 119 https://kanazawa-u.repo.nii.ac.jp/record/11731/files/AN00044309-12-1-111.pdf application/pdf 154.8 kB 2017-10-03