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Device and method for measuring steady-state extrusion viscous dissipation of micro-scale polymer fused mass

A viscous dissipation, polymer technology, applied in the field of polymer rheology testing, can solve the problem of no micro-scale polymer melt viscosity dissipation measurement device, etc., achieve a high measurement shear rate range, easy loading and unloading, temperature control accurate effect

Inactive Publication Date: 2009-09-16
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, there is no dedicated microscale setup for the measurement of viscous dissipation in polymer melts

Method used

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  • Device and method for measuring steady-state extrusion viscous dissipation of micro-scale polymer fused mass

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Embodiment Construction

[0010] The best embodiment of the present invention will be described in detail below in conjunction with technical solutions and accompanying drawings.

[0011] Measure the polymer material high-density polyethylene (HDPE) at a temperature of 200°C and an apparent shear rate of 10,000s -1 , the steady-state extrusion flows through the viscous dissipation of a capillary die with a diameter of 500 μm and an aspect ratio of 16.

[0012] Embodiment steps are as follows:

[0013] Step 1. First heat up the capillary rheometer, and when the set temperature reaches 200°C, install the outer hexagonal mold support (a) on the left side of the rheometer with a wrench, and install the capillary port from the inlet of the barrel Die, feed material into the barrel, install the plunger rod to pressurize and plasticize;

[0014] Step 2. Use the base (d) and the open top sleeve to install the temperature sensor into the outer hexagonal die holder (b) and press it tightly. Use a wrench to ins...

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Abstract

The invention relates to a device and a method for measuring steady-state extrusion viscous dissipation of a micro-scale polymer fused mass. The device and the method are characterized in that on the basis of a capillary rheometer with two material barrels, a temperature sensor is arranged at an outlet of a neck ring mold of a capillary tube in the material barrel through a fixing device, the outlet of the neck ring mold of the capillary tube is aligned with a measuring part of the temperature sensor, and the distance between the neck ring mold of the capillary tube and the sensor is adjusted by additionally mounting a spacer; and the other temperature sensor is arranged at the outlet of the other material barrel through the fixing device for the convenience of measuring the temperature of the fused mass simultaneously by the two sensors. The flow parameters of the fused mass are set on the rheometer, the fused mass flows out of the neck ring mold at certain shearing rate through by the extrusion action of a plunger, and the sensors measure the temperature of the extruded fused mass directly. The temperature difference of the two sensors is calculated out so that the temperature rise of the fused mass caused by the viscous dissipation can be measured. The device and the method has the advantages and benefits that the temperature control of the fused mass is constant, the temperature is measured accurately and quickly, the fixing device is easy to assemble and disassemble, the neck ring mold is convenient to replace, and the range of measuring the shearing rate is higherwider.

Description

technical field [0001] The invention belongs to the technical field of polymer rheology testing, in particular to a device and method for measuring the viscosity dissipation of microscale polymer melt steady-state extrusion flow. Background technique [0002] Viscous dissipation is an inherent physical phenomenon in the extrusion flow of polymer melts. The mechanical energy caused by the viscous friction force is converted into heat energy during the flow of the fluid, which will directly affect the temperature change during the flow of the fluid. Viscous dissipation is ignored in conventional extrusion processes. In the micro-scale range, the viscous dissipation is obvious, which affects the rheological properties of the melt, and the viscous dissipation needs to be measured. On the one hand, due to the small scale, it is difficult to install a temperature sensor in the capillary to directly measure the melt temperature; on the other hand, the melt needs to be kept at a c...

Claims

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Application Information

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IPC IPC(8): G01N11/04
Inventor 徐斌王敏杰于同敏赵丹阳
Owner DALIAN UNIV OF TECH
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