Capillary rheometer and method for measuring rheological properties of polymer materials

Abstract

The invention discloses a capillary rheometer and a method for measuring rheological properties of polymer materials. The capillary rheometer comprises a charging barrel, wherein the front end of the charging barrel is provided with a feed port, and the rear end of the charging barrel is provided with a discharging port. A first capillary channel, a material flowing pipeline and a second capillary channel are arranged in the charging barrel, and the feed port is communicated with the discharging port sequentially through the first capillary channel, the material flowing pipeline and the second capillary channel. The cross-sectional area of the material flowing pipeline is larger than that of the first capillary channel and the second capillary channel. The method can simultaneously measure shearing rheological parameters and extensional rheological parameters of the polymer materials. During measuring polymer composite materials, the method can avoid the influence of artificial factors, reduce the errors in measurement for several times, and increase the accuracy of measurement.

Description

technical field [0001] The invention relates to a capillary rheometer and a method for measuring rheological properties of polymer materials. Background technique [0002] The rheological properties of polymer materials are very important for the molding and processing of polymer materials, and accurate characterization of their rheological properties is of great significance for both theoretical research and practical production. Capillary rheometer is the most commonly used rheological instrument for characterizing the rheological properties of polymers and their composite systems. [0003] According to different stress modes, the rheological behavior of polymer materials can be divided into shear rheological behavior, extensional rheological behavior and a combination of the two. Under the action of the shear force field, the velocity gradient of the material is perpendicular to the transport direction during the transport process, while under the action of the tensile f...

AI Technical Summary

Problems solved by technology

Compared with a single barrel, this structure can increase the efficiency of the experiment, and can ensure the same test conditions and reduce the deviation caused by the experimental instrument. However, due to the complexity of this structure, the price of the instrument is also high, and in Two sets of polymer materials need to be added each time during the measurement, which will also face the same problems as the traditional single-barrel rheometer: 1. Artificial differences may be caused by the different tightness of compaction; 2. If the measured material is a composite system, filler dispersion, water content, air content, etc. will cause large differences in the results and reduce the comparability of the results; due to the influence of the above factors, the measurement accuracy of the existing capillary rheometer is low, and further research is required. improve

Images