POLYMER RHEOLOGY - INFLUENCE OF MOLECULAR WEIGHT AND POLYDISPERSITY

被引:106
作者
CROSS, MM
机构
[1] Imperial Chemical Industries Limited, Dyestuffs Division, Blackley, Manchester
关键词
D O I
10.1002/app.1969.070130415
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Literature data on the non‐Newtonian flow of bulk polymer and of polymer solutions are correlated on the basis of a four‐parameter equation, η = η∞ + (η0 − η∞)/[1 + (τD)m], η being the viscosity at shear rate D, and η0 and η∞ limiting values at D = 0 and D = ∞, respectively. The parameters η0, η∞, and τ all show dependence on molecular weight, and in general there is good correlation between τ and η0. There is evidence that τ is related to a molecular weight higher than the weight‐average. The exponent m shows dependence on molecular weight distribution and approaches an upper limit of unity for a monodisperse linear polymer. For linear unblended polymers it may be expressed empirically by m = (M̄n/M̄w)1/5. Copyright © 1969 John Wiley & Sons, Inc.
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页码:765 / &
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