希薄高分子溶液の動的粘弾性の濃度およびConformation依存性

概要

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Rouse and Zimm have derived theories of viscoelastic properties of random coil polymers in dilute solutions, and Kirkwood and Auer that for rodlike polymers. Comparing these theories with each other in the form of the normalized dispersion curve, we may obtain direct information on the degree of internal freedom of polymer molecules. Many experimental investigations on viscoelasticity of coiling polymers have been made for dilute and for concentrated solutions. Experimental results for dilute solutions show almost quantitative agreement with the theories of Rouse or Zimm, but those for concentrated solutions a systematic disagreement. From these results, it is clear that concentration effect on the viscoelasticity still remains some what ambiguous even in the region of dilute solutions. This is not surprising, because all these theories are concerned only with the intrinsic quantities corresponding to infinite dilution without taking account of intermolecular interaction. In this study the dynamic intrinsic viscosity and intrinsic rigidity, therefore, are defined experimentally as follows. [η']=lim__<c→0>(η'-η_s)/η_sc, [G']=lim__<c→0> G'/c. Considering that, with changing concentration, all relaxation times involved change to some extent as was pointed out by Ferry, we define also the limiting value of the terminal relaxation time as (τ_1)_0=lim__<c→0>τ(c).
社団法人日本材料学会の論文
1966-06-15