ポリエチレン溶融物における定常流粘度と動的粘度との比較 : 高分子液体の流動性

概要

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The steady-flow and dynamic properties of polyethylene melts measured with a rotating cylinder type rheometer have been compared with the current theories and existing data on the relation between the steady-flow and dynamic viscosities. Contrary to the prediction of DeWitt, the dynamic viscosity η' vs. angular frequency (ω) curve decreases earlier than does the apparent viscosity η_a vs. rate of shear (D) curve, and these curves cannot be superposed by simple shifting along the abscissa. Pao's theory is not necessarily be applicable to our experimental results : the dynamic fluidity J"ω(J" is the loss compliance) vs. ω curve is not always the same as the apparent fluidity 1/η_a vs. D curve. The empirical law originated by Cox and Merz fits very well to our results, and the η_a vs. D curve coincides very well with the |η| vs. ω curve, where |η| is the absolute value of complex viscosity. Nevertheless, the consistency η_c or the differential viscosity η_d is not the same as η', contrary to Strella's theory. Our finding might closely be connected with the essential difference in linearity between the steady-flow and the dynamic behavior.
社団法人日本材料学会の論文
1964-05-15