高分子ー粒子混合系の粘弾性

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Viscoelastic properties of disperse systems of carbon black in solutions of butyle rubber in liquid paraffin have been studied, measuring dynamic viscosity η', dynamic rigidity G', relaxation shear modulus G(t) and apparent viscosity η_a by means of two rotating cylinder type rheometers and an Instron type tensile tester, Tensilon. The main results obtained in this study are summarized as follows: (1) The yield value S_y evaluated from the Casson's equation, S^<1/2>=k_0+k_1D^<1/2>, with s as the shearing stress, D as the rate of the shear, and k_0 and k_1 as constants, is independent not only of the viscosity of media, as reported in the previous paper, ^<1)> but also of temperature. (2) The effect of the dispersed particles on the flow propertief appear markedly in longer time scales. (3) As the rate of the shear or frequency decreases, η_a, plastic viscosity η_<p1>, or η' increases more and more without showing definite zero-shear viscosity. Corresponding to this, G(t) or G' manifests a plateau of the order of magnitude of 10^4 dynes_cm^2. (4) for disperse systems in concentrated polymer solutions above 10%, time-temperature superposition can be applied in shorter time scales but not in longer time scales. In the case of polymer solutions below 10%, however, the superposition can be applied in the entire range of time scale covered in this study. (5) The shift factor a_T is not affected by the particle concentration ranging from 0 to 12%. (6) As the polymer concentration increases, the effect of particles at higher rate of shear or frequency becomes less and less. (7) The zero-shear viscosity of solutions of butyl rubber in liquid paraffin is proportional first to polymer concentration c at lower concentrations but to c^7 at much higher concentrations such as 100%.
社団法人日本材料学会の論文
1968-04-15

高分子ー粒子混合系の粘弾性

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