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Method and device for measuring elastic modulus of volume of polymer melt

A bulk elastic modulus, measuring device technology, applied in the direction of measuring devices, using optical devices, using applied stable tension/pressure to test the strength of materials, etc.

Active Publication Date: 2012-01-18
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing polymer physical property measurement devices cannot directly measure the bulk modulus of polymer melt

Method used

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  • Method and device for measuring elastic modulus of volume of polymer melt
  • Method and device for measuring elastic modulus of volume of polymer melt
  • Method and device for measuring elastic modulus of volume of polymer melt

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Experimental program
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Effect test

Embodiment Construction

[0035] The above is a specific embodiment of the present invention, and its polymer melt bulk modulus test principle is as follows: figure 1 As shown, its temperature control and data acquisition and processing are as follows figure 2 shown.

[0036] Key performance indicators

[0037] Temperature control instrument: temperature control deviation ± 0.5 ℃;

[0038] Pressure display instrument: pressure measurement accuracy ± 1bra;

[0039] Michelson interferometer: the measurement accuracy of the displacement of the feeding rod reaches 0.001mm;

[0040] AD acquisition card: quantization error 0.076ε / mV;

[0041] How the test works

[0042] Such as figure 1 , figure 2As shown, through the temperature control instrument 27, the barrel 18 can be heated to the set temperature through the heater 19 and the temperature sensor 21. After the temperature reaches the set temperature and is kept warm for 30 minutes, the injected material rod 22 is added to the barrel 18. By rota...

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PUM

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Abstract

The invention relates to a method and a device for measuring an elastic modulus of a volume of polymer melt and belongs to the field of rheology processing of the polymer melt. The device comprises a mechanical part, an electric control part and an optical measurement part. The mechanical part comprises a rotating hand wheel, a ball screw linear guide rail mechanism, a support frame, a charging barrel with a pressure sensor, a temperature sensor and a heater, a charging rod, a sealed bottom plug with an exhaust structure, and a material rod limit mechanism consisting of a guide stop rod and ahorizontally arranged wire guide mechanism. The electric control part comprises a pressure display instrument connected with the pressure sensor, a temperature control instrument connected with the temperature sensor, an AD (analog-to-digital) acquisition card connected with the temperature control instrument and the pressure display instrument through communication cables, and a computer with the AD acquisition card. The optical part is a Michelson interferometer with reading accurate of 0.001mm. The method and the device have high integration degree and simple structure. The accurate measurement on the elastic modulus of the volume of the polymer melt can be realized.

Description

technical field [0001] The invention relates to a method and device for measuring the bulk elastic modulus of polymer melt. It can accurately measure the bulk elastic modulus of polymer melt, and belongs to the field of material performance testing. Background technique [0002] The bulk modulus of polymer melt is an important physical property of polymer melt. It is used in the evaluation of polymer processing properties such as rheological properties, the effective design of screw compression ratio in the extrusion process, and the melt density. The bulk modulus of the melt needs to be known when the physical parameters are measured indirectly (such as the online measurement of the melt density by ultrasonic technology). The existing polymer physical property measurement devices cannot directly measure the bulk modulus of polymer melt. [0003] The invention is based on the following measurement methods: [0004] The present invention is based on the following measureme...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01B11/02
Inventor 许红吴大鸣刘颖韩科孟庆云金艳
Owner BEIJING UNIV OF CHEM TECH
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