高粘度非牛顿模型材料流变性能的实验测定

本文介绍了一种高粘度非牛顿模型材料流变性能的实验测定原理和方法。此法不仅可以得到材料的表观剪应变速率和非牛顿剪应变速率,还可以得到流变指数、应力指数和表观粘度。采用夹心式流变仪对M503模型材料进行了试验测定。M503是一种聚合物模型材料,由橡胶腻子XM-50(一种黑色密封材料)与滑石粉按重量1:1混炼而成。实验结果表明:M503是一种假塑性材料,当非牛顿剪应变速率控制在7.52-105.56×10^-5s^-1范围时,其应力指数n变化范围为1.15-3.33,表观粘度变化范围为4.69-0.99×10⁷Pa·s。

EXPERIMENTAL DETERMINATION OF RHEOLOGICAL BEHAVIOUR OF HTGHLY VISCOUS MODEL MATERIALS

This paper introduces the principle and method for determing the rheological behaviour of highly viscous materials.Not only can the apparent shear strain rates, and non-newtonian shear strain rates of the materials be determined thereby but also the flow indexes, stress indexes and apparent viscosities.The rheological properties of a polymer model material "M503", a mixture of half-and-half of XM-50 (a sealing material) and talc powder by weight are subjected to determination.The test results show that the M503 is a pseudoplatic material and that its stress indexes vary from 1.15 to 3.33 and the apparent viscosities range between 4.69×10⁷ and 0.99×10⁷Pa·s when the non-newtonian shearstrain rates are between 7.52×10⁵s^-1 and 105.56×10^-5s^-1.