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Experimental device for pressure and flow field induced polymer crystallization and application method

An experimental device and flow field technology, applied in the field of pressure-shear experimental devices, can solve the problems of different shear rates, inconsistent structures in the radial direction, and pressure not too high, so as to improve macroscopic performance, good sealing performance, and use convenient effect

Active Publication Date: 2018-08-21
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the shape of the final sample is a disk, the shear rate in the radial direction of the disk is different, so the induced structure is inconsistent in the radial direction, so the disk-shaped sample prepared by PSD cannot be characterized. Its macroscopic properties such as mechanical properties, heat resistance and electrical properties cannot establish the relationship between shear rate and performance; if a rectangular sheet or dumbbell-shaped sample is directly prepared, the requirements for dynamic sealing are very high. The pressure in the tank should not be too high, otherwise material leakage will easily occur under high pressure
However, if the pressure is small, the range of experimental process parameters is very limited, and the coverage is too small to establish the relationship between pressure, shear, and the structure and properties of the sample in a wide range.
At the same time, the shear rate in the rectangular sheet or dumbbell-shaped specimen is also different in the thickness direction, so the relationship between a single shear condition and the structure and properties cannot be established

Method used

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  • Experimental device for pressure and flow field induced polymer crystallization and application method
  • Experimental device for pressure and flow field induced polymer crystallization and application method
  • Experimental device for pressure and flow field induced polymer crystallization and application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] a) heating the experimental device with a heating rod 10;

[0038] b) When heated to the set temperature of 180°C, add the experimental raw material isotactic polypropylene from the first hollow hole 4, press the sealing member 17 into the first hollow hole 4 with the pressure column 6, and keep warm for 10 minutes;

[0039] c) After all the raw materials are melted, continue to pressurize the pressure column 6, press the raw material melt into the groove 9, and then flow into the annular gap 8 until the pressure reaches the set value of 100MPa, and then keep it warm for 15 minutes;

[0040] d) Cool down to the experimental temperature of 150°C, and rotate the rotating rod 7 to perform rotational shearing on the melt in the annular gap 8 at a shear rate of 0.6s -1 , until the set time is 10 seconds, stop cutting;

[0041] e) keep warm for 30 minutes, the sample crystallizes, and inject water into the cooling medium channel 11 to cool down;

[0042] f) Take out the sampl...

Embodiment 2

[0045] a) heating the experimental device with a heating rod 10;

[0046] b) When heated to the set temperature of 180°C, add the experimental raw material isotactic polypropylene from the first hollow hole 4, press the sealing member 17 into the first hollow hole 4 with the pressure column 6, and keep warm for 10 minutes;

[0047] c) After all the raw materials are melted, continue to pressurize the pressure column 6, press the raw material melt into the groove 9, and then flow into the annular gap 8 until the pressure reaches the set value of 100MPa, and then keep it warm for 15 minutes;

[0048] d) Cool down to the experimental temperature of 150°C, rotate the rotating rod 7 to perform rotational shearing on the melt in the annular gap 8, and the shear rate is 5s -1 , until the set time is 10 seconds, stop cutting;

[0049] e) keep warm for 30 minutes, the sample crystallizes, and inject water into the cooling medium channel 11 to cool down;

[0050] f) After cooling down...

Embodiment 3

[0053] a) heating the experimental device with a heating rod 10;

[0054] b) When heated to the set temperature of 180°C, add the experimental raw material isotactic polypropylene from the first hollow hole 4, press the sealing member 17 into the first hollow hole 4 with the pressure column 6, and keep warm for 10 minutes;

[0055] c) After all the raw materials are melted, continue to pressurize the pressure column 6, press the raw material melt into the groove 9, and then flow into the annular gap 8 until the pressure reaches the set value of 100MPa, and then keep it warm for 15 minutes;

[0056] d) Cool down to the experimental temperature of 150°C, rotate the rotating rod 7 to perform rotational shearing on the melt in the annular gap 8, and the shear rate is 8s -1 , until the set time is 10 seconds, stop cutting;

[0057] e) keep warm for 30 minutes, the sample crystallizes, and inject water into the cooling medium channel 11 to cool down;

[0058] f) After cooling down...

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Abstract

The invention discloses an experimental device for pressure and flow field induced polymer crystallization and an application method. The experimental device comprises an upper die and a lower die which are connected through a bolt, wherein a first hollowing hole and a second hollowing hole are formed in the upper die in a penetrating manner, a compression column is arranged in the first hollowinghole, a rotating rod is arranged in the second hollowing hole, and an annular gap is formed between the upper end of the rotating rod and the second hollowing hole; a groove is formed in the surface,contacted with the upper die, of the lower die and communicated with the first hollowing hole and the second hollowing hole. The experimental device is simple in structure and convenient to use, by means of first heating and pressurization and later rotational shearing of the raw materials, crystal formation is promoted, a shish-kebab structure or a thicker lamellar crystal is formed, and macro-performance is improved; mechanical properties of a sample can be characterized; a relation of machining conditions, structure and performance can be obtained by comparison of machining conditions, internal morphological structure and macro-performance, and a theoretical and experimental basis is provided for actual contour machining.

Description

technical field [0001] The invention relates to an experimental device for inducing polymer crystallization by pressure and a flow field and its use method, in particular to a pressure-shear experimental device and its use method for preparing samples that can simultaneously characterize the microstructure and macroscopic properties. Background technique [0002] Flow-induced polymer crystallization is a basic problem in polymer physics. For a long time, polymer science and industry have carried out a lot of research work, and some results have been widely accepted, such as: flow field significantly accelerates polymer crystallization kinetics, crystallization The acceleration of the kinetics is mainly attributed to the increase of the nucleation density; the strong flow field changes the crystallization morphology of the polymer, induces the generation of oriented crystal structure, and so on. In addition to the flow field, the pressure field also significantly affects the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
CPCG01N1/28
Inventor 雷军李忠明
Owner SICHUAN UNIV
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