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A method to control the surface charge of polymers by infrared light

A surface charge and polymer technology, applied in the field of anti-friction and anti-wear, can solve the problems of not being able to adjust freely, the amount of charge increases, and the amount of charge cannot be restored to the initial value, etc., to prevent danger, reduce sliding distance, and control methods. novel effect

Active Publication Date: 2022-03-29
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these surface charge adjustment methods can only change the amount of charge in a certain direction, that is, the amount of charge increases or decreases, but cannot be adjusted freely according to the actual situation, and after removing the external stimulus, the amount of charge cannot be restored to the initial value, that is, the amount of charge changes are irreversible

Method used

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  • A method to control the surface charge of polymers by infrared light
  • A method to control the surface charge of polymers by infrared light
  • A method to control the surface charge of polymers by infrared light

Examples

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preparation example Construction

[0033] In the present invention, the preparation method of the polymer composite membrane preferably comprises the following steps:

[0034] The polymer, the light-to-heat conversion material and the curing agent are mixed, the obtained mixture is coated on the surface of the substrate, and the film is peeled off after drying to obtain the polymer composite film.

[0035] The present invention does not have special requirement to the kind of described curing agent, adopts the curing agent well-known to those skilled in the art to get final product, specifically can select corresponding commercially available curing agent according to the kind of polymer; The present invention does not have to the consumption of described curing agent For special requirements, the dosage well known to those skilled in the art can be used. In the present invention, the mixing method is preferably stirring and mixing, the rotational speed of the stirring and mixing is preferably 100-500 r / min, an...

Embodiment 1

[0048] Accurately weigh 10 parts of PDMS (Sylgard 184), 1 part of curing agent, 0.1 part of spherical Fe with a particle size of 5nm 3 o 4 In a beaker, stir mechanically at a speed of 200r / min for 1h to make it evenly mixed, scrape the mixed material evenly on a PET plastic plate with a scraper, dry it in an oven at 80°C for 2h, take it out, and peel off the film to obtain a polymer Composite film.

[0049] The polymer composite film was cut into a size of "4cm×4cm", and ITO / PEN electrodes were pasted on the back and leads were drawn out to obtain PDMS electrodes. At the same time, mix 2 parts of nylon 11 particles with 9 parts of anhydrous formic acid and 9 parts of dichloromethane and stir for 5 hours to dissolve them, and then spin coat them on copper tape at a speed of 2000 r / min on a spin coater and draw out copper wires. Dry at 60°C for 1 hour to obtain a nylon 11 electrode; cut the PTFE membrane into a size of "4cm×4cm", stick a copper electrode on the back and lead o...

Embodiment 2

[0053] Accurately weigh 10 parts of PDMS (Sylgard 184), 1 part of curing agent, 0.05 parts of spherical Fe with a particle size of 5nm 3 o 4 In a beaker, mechanically stir at a speed of 200r / min for 1 hour to make it evenly mixed. Use a spatula to evenly scrape it on a PET plastic plate, dry it in an oven at 80°C for 2 hours, take it out, and cut it into a size of "4cm×4cm". size of.

[0054] Put the composite film on the friction testing machine, use glass ball and PTFE ball as the friction pair (glass ball friction makes the surface of the composite film negatively charged, PTFE ball friction makes the surface of the composite film positively charged), test the two kinds of balls and PDMS composite film The coefficient of friction when rubbing. During the friction coefficient test, after the friction coefficient reached a stable level, the infrared light source was turned on to irradiate the friction surface between the ball and the PDMS composite film, and the change of t...

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Abstract

The invention relates to the technical field of anti-friction and anti-wear, and provides a method for regulating the surface charge of a polymer through infrared light. The invention uses photothermal conversion materials and polymers as raw materials to prepare polymer composite films, and then uses infrared light to irradiate polymer composite films. After being irradiated by infrared light, the temperature of photothermal conversion materials rises, generating thermal electron emission, and is in the state of excitation. The thermal electrons in the state will migrate to the surface of the polymer. When the polymer surface is positively charged, the thermal electrons migrating to the surface will neutralize these positive charges, reducing the number of positive charges; when the polymer surface is negatively charged When , the hot electrons migrating to the surface superimpose with the electrons on these surfaces, resulting in an increase in the number of negative charges. The regulation method of the surface charge of the polymer provided by the invention is novel, and the light-to-heat conversion material has been industrialized at present, has a wide range of sources, and has broad application prospects in the field of anti-friction and anti-wear.

Description

technical field [0001] The invention relates to the technical field of anti-friction and anti-wear, in particular to a method for regulating the surface charge of a polymer through infrared light. Background technique [0002] The phenomenon of generating and retaining charges on the polymer surface through contact separation or friction is called contact electrification or triboelectrification. Triboelectrification is a ubiquitous physical phenomenon that mainly occurs on the surface of friction pair materials. After rubbing, the triboelectric charge is usually trapped on the surface (within 2 μm) for temporary storage. These temporary charges form a surface potential on the polymer surface, which is the key for triboelectric nanogenerators (TENGs) to generate electrical energy output and generate electrostatic discharge on the polymer surface. Therefore, if the amount of tribocharge during or after rubbing is increased, the electrical output performance of TENG can be imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/12C08L83/04C08L61/06C08L63/00C08L75/04C08L67/02C08K7/18
CPCC08J7/123C08J2383/04C08J2361/06C08J2363/00C08J2375/04C08J2367/02C08K7/18
Inventor 王道爱王楠楠周峰
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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