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Polyethylene terephthalate (PET)-based composite material capable of sensing stress variation and preparation method thereof

A composite material and stress change technology, applied in the field of PET-based composite materials capable of sensing stress change and their preparation, can solve the problems of high sensitivity of force-electric coupling effect, little influence by humidity, strong reversibility, etc., and achieve good deformation Coordinated performance, small humidity effect, strong reversibility

Active Publication Date: 2014-11-26
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a PET-based composite material capable of sensing stress changes and its The preparation method, the composite material has good deformation coordination performance, good compatibility with asphalt mixture, stable resistivity, high sensitivity of force-electric coupling effect, strong reversibility, little influence by humidity, and electric Signal testing is virtually independent of substrate polarization

Method used

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  • Polyethylene terephthalate (PET)-based composite material capable of sensing stress variation and preparation method thereof
  • Polyethylene terephthalate (PET)-based composite material capable of sensing stress variation and preparation method thereof
  • Polyethylene terephthalate (PET)-based composite material capable of sensing stress variation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Materials: 2.5 parts of waste PET, 7.5 parts of aggregate, 0.05 part of talcum powder, 0.5 part of fly ash, and 1.2 parts of graphite. The gradation of the aggregate is shown in Table 3.

[0061] Among them: graphite is medium carbon flake graphite with carbon content ≥ 94%, with an average particle size of 11 μm to 13 μm;

[0062] Nickel powder is gray black dendritic nickel powder with a nickel content of 99.9%, particle size ≤13μm;

[0063] Fly ash is Class I fly ash;

[0064] Talc powder is SL plastic grade talc powder.

[0065] Table 3, embodiment 1 use the gradation of aggregate

[0066]

[0067] Preparation: Dry mix waste PET, aggregate, talcum powder, and fly ash evenly, place in an oven and heat at 260°C-285°C for 150min-180min; add graphite one by one, mix until uniform, and statically press to form, The static pressure is controlled at 15MPa; together with the test mold, put it into the sand bath, keep it healthy for 24 hours at 80°C to 160°C, and demol...

Embodiment 2

[0070] The difference between this example and Example 1 is that the aggregate gradation is adjusted as follows, the addition of 0.6-0.3, 0.3-0.15, and 0.15-0.075 third-grade materials is added, and the gradation of the aggregate is finer. As in Table 4.

[0071] Table 4, embodiment 2 use the gradation of aggregate

[0072]

[0073] Results: The compressive strength of the material prepared in this example is 28.73MPa, which is lower than that of the material prepared in Example 1; its resistivity is 48.74Ω·m, which is close to that of Example 1, which also shows the degree of gradation Fine-tuning has little effect on resistivity;

Embodiment 3

[0075] The difference between this example and Example 1 is that the aggregate gradation is adjusted as follows, the addition of 9.3-4.75, 4.75-2.36, and 2.36-1.18 third-grade materials is added, and the gradation of the aggregate is coarse. As in Table 5.

[0076] Table 5, embodiment 3 use the gradation of aggregate

[0077]

[0078] Results: The compressive strength of the material prepared in this example is 29.54MPa, which is lower than that of the material prepared in Example 1; its resistivity is 43.27Ω·m, which is close to that of Example 1, which also shows the degree of gradation Trimming has little effect on resistivity.

[0079] Use the test piece prepared in this embodiment to carry out the force-electric coupling test, and the loading method is as follows:

[0080] Loading method 1: The maximum load is 1.43MPa, the minimum load is 0.18MPa, the frequency of cyclic load is 0.073Hz, the frequency of resistance data collection is 2.0Hz, the same load is used for ...

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Abstract

The invention discloses a polyethylene terephthalate (PET)-based composite material capable of sensing stress variation. The composite material comprises a conductive phase functional component and a PET-based material, wherein the conductive phase functional component accounts for 6 to 80 percent of the mass of the PET-based material. The invention also discloses a preparation method of the material. The composite material has the advantages of good deformation coordination performance, high compatibility with a bituminous mixture, stable electrical resistivity, high force-electricity coupling effect sensitivity, strong reversibility and low moisture influence, and the electrical signal test is hardly affected by substrate polarization. The composite material can be applied to stress / strain monitoring of bituminous concrete structures such as road pavements, bridge deck pavements and airport runways, and can also be applied to monitoring of stress / strain in other fields.

Description

technical field [0001] The invention relates to a smart material and a preparation method thereof, in particular to a PET-based composite material capable of sensing stress changes and a preparation method thereof. Background technique [0002] At present, the composite materials made of polymers mixed with specific conductive fillers not only have good electrical conductivity, but also their electrical conductivity is sometimes affected by changes in external fields (electric field, temperature field, force field, etc.) Pressure-sensitive and pull-sensitive), temperature-sensitive, humidity-sensitive, nonlinear and other functional (or intelligent) properties, the application of this type of polymer composite material has been spread all over the fields of aerospace, electronics, computers, construction and medical treatment. [0003] In recent years, with the rapid development of intelligent transportation, the requirements for the versatility and intelligence of ordinary ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K3/00C04B26/18C04B14/36C04B14/34
Inventor 姚占勇韩杰商庆森葛智张晓萌崔衡张恺姚凯邹鑫潘相宏
Owner SHANDONG UNIV
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