理想鎖高分子およびポリ-L-,コポリ-DL-アミノ酸希薄溶液の粘弾性

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In view of the theories of viscoelastic properties of dilute polymer solution dealing with the state at infinite dilution, we have introduced the following intrinsic quantities corresponding to infinite dilution, the complex intrinsic rigidity, [G]=lim(G-iωη_s)/c; the dynamic intrinsic viscosity,[η]=lim_<c→0>(η-η_s)/η_s: and the limiting relaxation time, (τ_p)_0=lim_<c→0>(c)=lim_<c→0> (c)0> K_p(η_<sp>/c) M/RT. Here K_p is the relaxation time factor determined by the theories. The dimensionless functions of the intrinsic rigidity and viscosity are derived for random coil polymers from the Rouse-Zimm theories as follows, [numerical formula] where K_1=0.608 for the Rouse theory and K_1=0.422 for the Zimm theory. The same functions are derived for rod-line polymers from the Kirkwood-Auer and dumbbell model theories as follows,[numerical formula] where A=1/5, B=3/5 and K=5/4 for the K-A theory, and A=1/3, B=1/2 and K=6/5 for the dumbbell model theory. The intrinsic rigidity and the dynamic intrinsic viscosity are both obtained by means of torsional crystal method at frequencies of 19.6kc, 39.2kc and 117.7kc, and all the measurements are confined within concentration range 0.1 to 0.7%. The results for poly-γ-methyl-D-glutamate (PMDG) and poly-γ-benzyl-L-glutamate (PBLG) in helix solvents show that the K-A theory gives qualitatively a good first approximation to viscoelastic behavious of α-helix molecules in dilute solution. The internal freedom of α-helix molecules is under strong restrictions and it is considered as consisting of rigid rod-like molecules.
社団法人日本材料学会の論文
1966-05-15

理想鎖高分子およびポリ-L-,コポリ-DL-アミノ酸希薄溶液の粘弾性

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