Method and device for online representing crystallization kinetic process through ultrasonic wave

An ultrasonic and kinetic technology, applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, measurement devices, and material analysis using sonic/ultrasonic/infrasonic waves, etc., can solve problems such as difficult on-line characterization, achieve easy high-pressure testing, and convenient formulations Research and product quality evaluation, optimize the effect of cooling and solidification process

Inactive Publication Date: 2014-01-15
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In fact, the conventional PVT test must be carried out for a certain amount of mater

Method used

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  • Method and device for online representing crystallization kinetic process through ultrasonic wave
  • Method and device for online representing crystallization kinetic process through ultrasonic wave
  • Method and device for online representing crystallization kinetic process through ultrasonic wave

Examples

Experimental program
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Embodiment approach 1

[0028] Implementation plan one: with figure 1 The material cavity of the PVT test device is equipped with an ultrasonic probe to conduct online tests on the cooling process of the polypropylene melt, and obtain the synchronous corresponding curves of the specific volume of polypropylene under isothermal and isobaric conditions and the velocity of ultrasonic sound transmitted therein versus time, see Figure 4 and Figure 5 .

[0029] At a certain temperature T and pressure P, the ultrasonic sound velocity transmitted in the material is uniquely corresponding to its specific volume, and the curves are almost parallel under different pressures; under a certain pressure, Figure 4 The variation curve of medium ultrasonic sound velocity with temperature and Figure 5 The change curve of medium specific volume with temperature is similar, and the inflection point of the sound velocity curve can determine the crystallization start temperature (T CS ) and end temperature (T CE )....

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Abstract

The invention discloses a testing method and device for online representing crystallization kinetic process through ultrasonic wave. Temperature and pressure sensors and an ultrasonic probe are mounted in the closed material cavity of a PVT testing device, the material is cooled to perform crystallization, synchronous detection is performed to obtain specific volume and ultrasonic wave sound velocity pair time curves at different pressure and temperature, the thermal state of the material can be classified into solid state, crystalline region and molten state from the inflection points of the curves, and the synchronous ultrasonic wave velocity pair specific volume is plotted and fitted to establish the quantitative relation. The mode that the crystallinity degree in a crystallization kinetic equation is expressed through adopting the specific volume, is changed into the mode that the crystallinity degree in a crystallization kinetic equation is expressed through adopting an ultrasonic wave velocity, the crystallization process is quantificationally analyzed, and the rule of influence of material composition, temperature, pressure and medium on the crystallization is researched. The temperature and pressure sensors and the ultrasonic probe are mounted on a production line or the material cavity of a die, the crystallization process can be online represented conveniently in the normal position and lossless way, feedback can be optimized, the cooling technology and the formula can be controlled, and the product quality can be evaluated. High-pressure online testing and rapid pressure and temperature change testing are performed easily through the method.

Description

technical field [0001] The invention relates to the field of material testing, in particular to a method and a device for ultrasonic on-line characterization of material crystallization dynamics process. Background technique [0002] Some materials are supercooled liquids during cooling, and form crystalline structures through local ordering. This process is a thermodynamic process. Conditions such as material composition, temperature, pressure, and medium have an impact on the crystal structure, crystallization rate, and crystallinity. Accurately grasping the law of this influence can effectively control the microstructure and properties of the product. [0003] During the crystallization process, properties such as heat capacity and specific capacity (reciprocal of density) of the material change, and monitoring the change can characterize the crystallization kinetic process. Dynamic scanning calorimeter (DSC) etc. can be used to characterize the heat capacity change duri...

Claims

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Application Information

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IPC IPC(8): G01N29/07G01N29/024
Inventor 王克俭程丽华
Owner BEIJING UNIV OF CHEM TECH
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