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- W2038862307 abstract "Non-Newtonian flow in polymers appears to occur only at molecular weights above Mc, the critical molecular weight above which chain entanglement is believed to occur. Studies of the non-Newtonian behaviour in systems such as poly(dimethylsiloxane) in a narrow molecular weight range (Mc < M < 5Mc) indicated a simple variation of the viscosity/molecular weight curve with increasing shear stress. In this work polyethylene, studied over a much wider molecular weight range (Mc < M < 70Mc), shows more complex behaviour, the onset of non-Newtonian flow occurring at progressively lower shear rates or shear stresses as the molecular weight increases above Mc. The dependence of melt viscosity on molecular weight becomes less pronounced as shear stress or shear rate is increased, permitting the calculation of a high shear rate at which the melt viscosity apparently becomes independent of molecular weight." @default.
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- W2038862307 date "1963-01-01" @default.
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- W2038862307 title "Viscosity/Molecular weight relation in bulk polymers—I" @default.
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- W2038862307 doi "https://doi.org/10.1016/0032-3861(63)90042-9" @default.
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