Rheological Properties of Polymer-Modified Emulsion Residue

Abstract

The rheological properties of four polymer modified emulsions and a control (AC-10) emulsion were characterized using both routine test methods, such as penetration and softening point, and more rigorous methods, which included low temperature stiffness measurements using a bending beam rheometer, and dynamic mechanical analysis over a wide range of temperatures and frequencies. It was found that addition of the polymer modifiers had little effect on the low temperature stiffness of the emulsion residue. Evaluation of limiting stiffness temperatures determined from experimental data and as estimated from various versions of Van der Poel's nomograph showed that the nomographs in general gave significantly lower values than those found from the experimental data. This indicates that Van der Poel's nomograph should not be used in estimating low temperature properties for either neat or modified emulsion residue. Some of the modifiers did slightly increase the consistency of the residue at high temperatures, which could reduce flushing and bleeding in surface treatments constructed with polymer modified emulsions.