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- W2369014766 abstract "The effect of shear rate on the viscosity of polymethylmethacrylate in benzene was studied at 25℃ by means of an Ubbelohde dilution viscometer under external hydrostatic pressure. Four fractionated and one unfractionated samples having molecular weights ranging from 4×10~5-5×10~6 were used for measurement. The maximum shear rate at the capillary wall varied in the range 500-8000 sec~(-1). We treated our experimental data by a power law rheological function, from which the polymer solutions show non- Newtonian behavior, except one sample having lowest molecular weight (M=4×10~5). Flow curves were also deduced directly from the efflux times according to the theory of Weisenberg. For the non-Newtonian polymer solution, the relative viscosity η_r~t is defined as the ratio of the maximum shear rate D_R of the Newtonian solvent to that of the non-Newtonian solution under the same maximum shear stress S_R. The values of η_r~t so obtained show that the extrapolation of ln η_r~t or other functions of η_r~t toward D_R→0 is not practical, because the data deviate more from the linear extrapolation when D_R gets smaller. Two definitions of intrinsic viscosity for the non-Newtonian polymer solution were considered: (1) For a given value of D_R, (?); (2) for a given value of (?). These two definitions become identical for a Newtonian solution. Our experimental data show that, at given D_R, lnη_r~l/C plots are linear, while (η_r~l-1)/C plots are curved; at given S_R, both (lnη_r~l /C)-C and ((η_r~l-1)/C)-C plots are linear and give the same intercept on extrapolation to zero concentration. The values of [η]_D and [η]_s decrease with increasing D_R or S_R, and the change is more pronounced at low values of D_R or S_R, so that neither the extrapolation of [η]_D toward D_R→0 nor that of [η]_s toward S_R→0 is practical. In such cases, we propose the use of [η]_D at D_R=3000 sec~(-1) or [η]s at S_R = 25 dyne/cm~2 for the viscometric molecular weight determination of the polymer." @default.
- W2369014766 created "2016-06-24" @default.
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- W2369014766 date "1955-01-01" @default.
- W2369014766 modified "2023-09-23" @default.
- W2369014766 title "SHEAR DEPENDENCE OF THE VISCOSITY OF POLYMETHYLMETHACRYLATE'IN BENZENE" @default.
- W2369014766 hasPublicationYear "1955" @default.
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