直鎖および分岐ポリエチレン分別物の溶融粘性

概要

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Hereunder is presented a report of studies made of the melt viscosities of the fractions of linear and ethyl-branched polyethylenes having very narrow molecular weight distributions. The Newtonian melt viscosities, η_o, of the linear fractions were related to their weight-average molecular weight M_w, by the following equation, at 190℃. η_o=2.39×10^<-15>M_w^<3.42&gut; It was possoble to reduce the relation between the viscosities and the shear rates of these fractions to a single master curve irrespective of their molecular weights, using the reduced variables, η/η_o and η_oM_wγ^^・ for the ordinate and the abscissa, respectively. Meanwhile, this master curve was different from that of the polyethylenes having broader molecular weight distributions : the reduced viscosity of the former fell more sharply than the latter as the reduced hear rate increased. It was found that in the branched fractions having 10-25 ethyl-branches per 1000 chain atoms, the Newtonian viscosities were about half a decade greater than that of the linear fractions at the onset of the non-Newtonian flow, were lower than the linear homologues.
社団法人日本材料学会の論文
1971-05-15