CN112029243A - Light-driven flexible film based on salicylaldehyde Schiff base, and preparation method and application thereof - Google Patents
Light-driven flexible film based on salicylaldehyde Schiff base, and preparation method and application thereof Download PDFInfo
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- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
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Abstract
The invention belongs to the field of organic chemistry, and particularly relates to a light-driven flexible film based on salicylaldehyde Schiff base, a preparation method and application thereof. The light-driven flexible membrane is formed by doping salicylaldehyde Schiff base molecules with a cheap and easily-obtained flexible high polymer material, has good light-driven sensitivity, is successfully applied to the aspects of a light-driven arm, a light-driven butterfly drum wing and a light-driven switch, and provides certain reference for the application of a light-driven actuator in bionic equipment. The preparation method combines the photosensitive micromolecule-salicylaldehyde Schiff base with the flexible macromolecule in a simple doping mode, and prepares the light-driven flexible membrane material with good light responsiveness in a mode that the hot mixed liquid is dripped on the substrate with the sacrificial layer on the surface.
Description
Technical Field
The invention belongs to the field of organic chemistry, and particularly relates to a light-driven flexible film based on salicylaldehyde Schiff base, and a preparation method and application thereof.
Background
The stimulus responsive material is one of intelligent materials, and is a material which senses stimulus and has specific physical or chemical properties which respond to directional changes. Of these smart polymer materials, photopolymers are particularly suitable for use in constructing soft actuators because light is a clean light source that allows for non-contact precise control of the material, thereby allowing multiple functions to be achieved by the subtle movements of the photosensitive actuators. Particularly azo-based photosensitive molecules with Liquid Crystal (LC) polymers, exhibit unique properties such as elasticity, anisotropy, stimulus responsiveness and molecular synergy. In response to an external stimulus, the macromolecules rearrange, coupled with the conformation of the polymer backbone, to produce a controlled and reversible macroscopic shape change throughout the sample. The polymer has light responsiveness by combining the photo-generated chromogens or photo-thermal particles. Various opto-mechanical actuators, including motors, pumps and valves, have been fabricated using liquid crystal composites based on azo-based photosensitive molecules to perform similar functions with conventional functions through different photo-responsive mechanisms (i.e., photochemical phase transition, weibert effect and photothermal effect). In addition, it is also used in imitating the movement of the natural world, such as artificial worms and irises. Through reasonable design of the structure, more complex motion behaviors such as high-frequency vibration, grasping of a specific object, automatic control of light flux, accurate control of a small amount of liquid and the like are realized.
A great deal of research is respectively carried out on the properties and mechanisms of photochromic molecules of salicylaldehyde Schiff bases serving as one member of photosensitive molecules by Hadjoudis, Sliwa and the like, and the molecular photochromism is provided to be possibly caused by intramolecular proton transfer (ESIPT) of the molecules caused by illumination and further interconversion of a ketone structure, so that the salicylaldehyde Schiff bases have a plurality of photoisomerization processes. The molecule has the advantages of easy preparation, photostimulation fatigue resistance, femtosecond level of ESIPT process and the like, and provides possibility for manufacturing a repeatable ultrafast optical drive actuator. In the field of light-driven actuators, although researchers have adopted many methods to improve the fabrication and sensitivity of flexible liquid crystal composite actuators, such as using 3D printing technology to realize various shapes, or using laser direct writing technology to control the movement of micro-actuators, these methods usually involve high-cost device fabrication and complex synthesis processes, and there is an increasing demand for light-driven deformation using polymer materials that do not have liquid crystal properties and are inexpensive and easy to prepare. The prepared simple salicylaldehyde Schiff base molecules are combined with cheap and easily-obtained non-liquid crystal flexible polymers, so that the possibility of simple, quick and large-area preparation of the optical drive actuator is provided.
Disclosure of Invention
One of the purposes of the invention is to provide a light-driven flexible film based on salicylaldehyde Schiff base, which has good light-driven sensitivity.
The invention also aims to provide a preparation method of the light-driven flexible film based on the salicylaldehyde Schiff base, which is simple and cheap and can be produced in a large scale.
The invention also aims to provide application of the light-driven flexible film based on the salicylaldehyde Schiff base.
The scheme adopted by the invention for realizing one of the purposes is as follows: a light-driven flexible film based on salicylaldehyde Schiff base is composed of the salicylaldehyde Schiff base doped flexible high polymer material.
The invention utilizes the mechanism that salicylaldehyde Schiff base photosensitive molecules generate Excited State Intramolecular Proton Transfer (ESIPT) and ketonic structure interconversion under illumination to modify the molecular skeleton of the salicylaldehyde Schiff base photosensitive molecules, and realizes the flexible membrane material with macroscopic light-driven deformation of different degrees. The prepared light-driven flexible film has higher sensitivity to ultraviolet-blue light in different degrees, and can be cut, designed and spliced at will.
Preferably, the molecular formula of the salicylaldehyde schiff base is shown as the formula (I):
wherein R is1H, F or Br; r2Is composed of
Preferably, the mass ratio of the salicylaldehyde Schiff base to the high polymer material is 1: 8-15.
Preferably, the high polymer material is PET, and the average molecular weight of the PET is 2-3 x 104The ratio of the weight average molecular weight to the number average molecular weight is 1.5 to 1.8.
The second scheme adopted by the invention for achieving the purpose is as follows: a preparation method of the light-driven flexible film based on the salicylaldehyde Schiff base comprises the following steps:
(1) preparing a mixed solution:
dissolving salicylaldehyde Schiff base and a high polymer material in a toluene solution, stirring and dissolving at a certain temperature, and preparing a mixed solution;
(2) preparation of light-driven flexible film based on salicylaldehyde Schiff base
After a substrate is pretreated, coating a sacrificial layer on the surface of the substrate, coating the mixed solution prepared in the step (1) on the surface of the sacrificial layer at a certain temperature, drying to form a light-driven thin film layer, transferring the substrate into a solvent to enable the light-driven thin film layer to fall off, and drying to obtain the light-driven flexible film based on the salicylaldehyde Schiff base.
Preferably, in the step (1), the total mass concentration of the salicylaldehyde Schiff base and the high polymer material in the toluene solution is 60-70 mg/mL, and the solution is stirred and dissolved at the temperature of 45-65 ℃.
Preferably, in the step (2), the sacrificial layer is a water-soluble layer, the water-soluble layer is a PEDOT/PSS layer or a sodium carboxymethyl cellulose layer, and the solvent is water; the thickness of the sacrificial layer is 100-300 nm; the coating temperature of the mixed solution is 45-65 ℃.
Preferably, in the step (2), after the sacrificial layer is coated on the surface of the substrate, the substrate is annealed at 150 ± 30 ℃ for 5-10min, and then the mixed solution is coated.
Preferably, in the step (2), the thickness of the light-driven flexible film based on the salicylaldehyde Schiff base is 100-300 μm.
The scheme adopted by the invention for realizing the third purpose is as follows: the application of the light-driven flexible membrane based on the salicylaldehyde Schiff base is characterized in that the light-driven flexible membrane based on the salicylaldehyde Schiff base is prepared into a light-driven flexible actuator, and the light-driven flexible actuator is applied to the fields of light-driven lightweight micro equipment, micro light energy-mechanical energy conversion equipment and light-driven movable arms, wherein the light-driven flexible actuator is 500 +/-50 mW/cm at room temperature2The rapid deformation can be realized under the illumination of 365 nm-455 nm wave band of intensity.
The invention has the following advantages and beneficial effects:
(1) the light-driven flexible membrane provided by the invention is simple to prepare and good in effect, is formed by doping salicylaldehyde Schiff base molecules with a cheap and easily-obtained flexible high polymer material, has good light-driven sensitivity, is successfully applied to the aspects of a light-driven arm, a light-driven butterfly drum wing and a light-driven switch, and provides a certain reference for the application of a light-driven actuator in bionic equipment.
(2) The preparation method combines the photosensitive micromolecule-salicylaldehyde Schiff base with the flexible macromolecule in a simple doping mode, and prepares the light-driven flexible membrane material with good light responsiveness in a mode that the hot mixed liquid is dripped on the substrate with the sacrificial layer on the surface.
(3) The light-driven flexible film actuator prepared by the light-driven flexible film can generate macroscopic deformation capability of different degrees in the ultraviolet to blue light region through the reasonable design of the salicylaldehyde Schiff base structure.
(3) Through the structural design, the light-driven flexible film can be applied to light-driven lightweight micro equipment, micro light energy-mechanical energy conversion equipment and light-driven movable arms, and can stably run under ultraviolet-blue light.
(4) The light-driven flexible film has the characteristics of high sensitivity to ultraviolet-blue light regions, capability of being cut and spliced at will and the like, is different from other liquid crystal flexible deformation materials which are obtained in a laboratory through a complex process at present, and can be prepared in a large area by combining a spin coating mode and a drop coating mode through a simple doping method.
Drawings
FIG. 1: the light-driven flexible film prepared by the invention has a motion schematic diagram of bending behavior when being vertically illuminated in a horizontal state (one end of the film is fixed, the side surface of the film faces a light source, and a shaded part represents an upper stretching part and a lower stretching part);
FIG. 2: the invention discloses a preparation schematic diagram of a light-driven flexible film.
FIG. 3: inventive example 2 (FIGS. 3a), b), e) and f)), 3 (FIGS. 3c), d), g) and h)), 4 (FIGS. 3i) and j)), light-driven flexible films were prepared at 500 + -50 mW/cm2The photo is displayed by the deformation capacity under the light intensity of 455nm or 365 nm; stretching the prepared cylindrical film, horizontally placing the stretched cylindrical film, and vertically irradiating the stretched cylindrical film by using a light source;
FIG. 4: the light-driven movable arm prepared in the embodiment 5 of the invention is 500 +/-50 mW/cm at room temperature2A photograph of the arm reversibly bent under light intensity of 455 nm;
FIG. 5: the light-driven butterfly prepared in the embodiment 6 of the invention is 500 +/-50 mW/cm at room temperature2Photos of wings dancing under 455nm illumination with light intensity;
FIG. 6: the optical switch prepared in example 7 of the present invention was operated at 500. + -. 50mW/cm at room temperature2The circuit is switched on under the light intensity of 455nm illumination, and the picture of the LED lamp is lightened.
Detailed Description
The following examples are provided to further illustrate the present invention for better understanding, but the present invention is not limited to the following examples.
Example 1
Preparing a salicylaldehyde Schiff base molecule: under the protection of nitrogen, compounds 1 and 2 and anhydrous magnesium sulfate are dissolved in anhydrous ethanol according to the equivalent ratio of 1:1:2, and the mixture is stirred at room temperature for 2 hours, and then the anhydrous magnesium sulfate is removed by suction filtration and is added with proper amount of anhydrous magnesium sulfateWashing with water and ethanol until anhydrous magnesium sulfate is white, recrystallizing with petroleum ether/n-hexane, and vacuum drying to obtain product (I) containing compound 1
2 is
The product (I) is
(I)
Wherein R is1Is H, F or Br, R2Is composed of
The product salicylaldehyde schiff base molecule prepared in example 1 was used as the starting material for examples 2-4.
Example 2
The method comprises the following steps: preparing a mixed solution based on salicylaldehyde Schiff base molecules and flexible macromolecules
Salicylaldehyde schiff base molecules
And flexible high polymer polyethylene terephthalate (PET), wherein the average molecular weight of the high polymer PET is 2-3 multiplied by 104The ratio of the weight average molecular weight to the number average molecular weight is 1.5 to 1.8. The two are weighed according to the mass ratio of 1:15, mixed solution is prepared according to the proportion of 60mg/mL of the mixture and the toluene solution, and the mixed solution is stirred and dissolved at the temperature of 45 ℃.
Step two: preparation of light-driven Flexible film
Ultrasonically cleaning a glass substrate by using dichloromethane and toluene solution to ensure cleanness for later use, spin-coating a PEDOT (PSS) glass substrate with the thickness of about 100-300 nm on the surface of the glass substrate to be used as a sacrificial layer, and after the spin-coating is finished, placing the glass substrate with the PEDOT (PSS) on the surface layer on a heating table at 120 ℃ for annealing treatment. And then placing the surface-treated glass substrate on a hot table at 50 ℃, and dripping the surface-treated glass substrate with the mixed solution of the step one while the surface-treated glass substrate is hot. And after the surface film is stable, transferring the glass substrate to room temperature to slowly dry the glass substrate for about 2 hours, finally transferring the glass substrate into distilled water, taking out the glass substrate after the film is separated from the glass substrate, and drying to obtain the flat light-driven flexible film based on the salicylaldehyde Schiff base. The thickness of the light-driven flexible film is 100 to 300 μm.
The membrane material was cut to a size of 15mm by 5mm and then rolled into a cylinder using a capillary tube having a diameter of 1 mm. At a wavelength of 365nm to 455nm and an intensity of 500 +/-50 mW/cm2The flexible film can be bent to about 30-40 degrees under the irradiation of light, and has better light-driven deformation capability within 6s of response time.
FIG. 1 is a schematic diagram showing the bending behavior of a light-driven flexible film prepared according to the present invention when exposed to vertical light in a horizontally disposed state (with one end fixed and the side of the film facing a light source, and the hatched portion representing the upper and lower stretching portions); as can be seen from the figure: when the film in the initial state irradiates the shadow part, the film is bent towards the light immediately, and the film can restore the vertical state by reverse irradiation to show the photosensitive characteristic.
FIG. 2 is a schematic diagram of the fabrication of a light-driven flexible film of the present invention.
FIG. 3(a, b, e and f) shows that the light-driven flexible film prepared in this example is at 500. + -. 50mW/cm2The photo is displayed by the deformation capacity under the light intensity of 455nm or 365 nm; and stretching the prepared cylindrical film, horizontally placing the stretched cylindrical film, and vertically irradiating the stretched cylindrical film by using a light source. As can be seen from the figure: the undrawn cylindrical film which is vertical in the initial state has no obvious change when irradiated by 455nm light, and is bent by about 30 degrees immediately when irradiated by 365nm light; the stretched cylindrical film (the dotted frame indicates the stretched portion) was immediately bent at about 30 to 40 degrees by light when the stretched portion was irradiated with 455nm or 365nm light. The non-stretched film has selectivity to light of different wave bands, and the film regularity is better, namely, the stretching effect is favorable for the photosensitive film deformation.
Example 3
The method comprises the following steps: preparing a mixed solution based on salicylaldehyde Schiff base molecules and flexible macromolecules
Using salicylaldehyde schiff base molecules
The mixture and the high molecular PET are weighed according to the mass ratio of 1:8, an initial solution is prepared according to the ratio of 65mg/mL of the mixture and the toluene solution, the initial solution is stirred and dissolved at the temperature of 50 ℃, and the rest part is the same as the first step of the example 1.
Step two: preparation of light-driven Flexible film
Ultrasonically cleaning a glass substrate by using dichloromethane and toluene solution to ensure cleanness for later use, spin-coating 10mg/mL sodium carboxymethyl cellulose with the thickness of about 100-300 nm on the surface of the glass substrate to be used as a sacrificial layer, and after the spin-coating is finished, placing the glass substrate with the sodium carboxymethyl cellulose on the surface layer on a heating table at 150 ℃ for annealing treatment. And then placing the glass substrate with the surface layer treated on a hot table at 45 ℃, and dripping the glass substrate with the mixed solution of the step one while the glass substrate is hot. And after the surface film is stable, transferring the glass substrate to room temperature to slowly dry the glass substrate for about 4 hours, finally transferring the glass substrate into distilled water, taking out the glass substrate after the film is separated from the glass substrate, and drying to obtain the flat light-driven flexible film based on the salicylaldehyde Schiff base. The thickness of the light-driven flexible film is 100 to 300 μm.
The membrane material was cut to a size of 15mm by 5mm and then rolled into a cylinder using a capillary tube having a diameter of 1 mm. The light-driven flexible film based on the structure is illuminated in light (365 nm-455 nm,500 +/-50 mW/cm)2) The lower bending angle is about 30-40 degrees, and the response time is within 8s, so that the optical drive deformation capacity is better.
FIG. 3(c, d, g and h) is a graph showing the present example, where a light-driven flexible film was prepared at 500. + -. 50mW/cm2The photo is displayed by the deformation capacity under the light intensity of 455nm or 365 nm; stretching the prepared cylindrical film, horizontally placing the stretched cylindrical film, and vertically irradiating the stretched cylindrical film by using a light source; as can be seen from the figure: the undrawn cylindrical film which is vertical in the initial state has no obvious change when irradiated by 455nm light, and is bent by about 40 degrees immediately when irradiated by 365nm light; the stretched tubular film (the dotted frame indicates the stretched portion) was bent at about 30 to 40 degrees to light immediately after the stretched portion was irradiated with 455nm or 365nm light. Showing the unstretched film for different wave bandsThe light has selectivity, and the better the film regularity, namely the stretching effect, is beneficial to the deformation of the photosensitive film.
Example 4
The method comprises the following steps: preparing a mixed solution based on salicylaldehyde Schiff base molecules and flexible macromolecules
Using salicylaldehyde schiff base molecules
Weighing the mixture and high molecular PET according to a mass ratio of 1:10, preparing an initial solution according to a ratio of 67.5mg/mL of the mixture and toluene solution, and stirring and dissolving the initial solution at 65 ℃. The rest is the same as the first step of example 1.
Step two: preparation of flexible polymer optical drive film
Ultrasonically cleaning a glass substrate by using dichloromethane and toluene solution to ensure cleanness for later use, spin-coating 30mg/mL sodium carboxymethyl cellulose with the thickness of about 100-300 nm on the surface of the glass substrate to be used as a sacrificial layer, and after the spin-coating is finished, placing the glass substrate with the sodium carboxymethyl cellulose on the surface layer on a heating table at 170 ℃ for annealing treatment. And then placing the surface-treated glass substrate on a 65 ℃ hot table, and dripping the surface-treated glass substrate with the mixed solution of the step one while the surface-treated glass substrate is hot. And after the surface film is stable, transferring the glass substrate to room temperature to slowly dry the glass substrate for about 6 hours, finally transferring the glass substrate into distilled water, taking out the glass substrate after the film is separated from the glass substrate, and drying to obtain the flat light-driven flexible film based on the salicylaldehyde Schiff base. The thickness of the light-driven flexible film is 100 to 300 μm.
The membrane material was cut to a size of 15mm by 5mm and then rolled into a cylinder using a capillary tube having a diameter of 1 mm. The light-driven flexible film based on the structure is illuminated in light (365 nm-455 nm,500 +/-50 mW/cm)2) The lower bending can enable the two ends to be parallel, namely the bending towards light is about 90 degrees, the response time is within 4s, and the optical drive deformation capability is the best.
FIG. 3(i, and j) shows that the light-driven flexible film prepared in this example is at 500. + -. 50mW/cm2The photo is displayed by the deformation capacity under the light intensity of 455nm or 365 nm; stretching the prepared cylindrical film, horizontally placing the stretched cylindrical film and polishingThe source is vertically irradiated with the stretching wide surface; as can be seen from the figure: when the vertical unstretched tubular film in the initial state is irradiated by 365nm light, the bending of about 40-50 degrees is generated immediately; the stretched cylindrical film (the dotted frame indicates the stretched portion) was bent by light of about 90 ° immediately after the stretched portion was irradiated with 365nm light. Compared with the photosensitive effect of the films of examples 3 and 4, the film shows the maximum photoinduced deformation capacity.
Example 5
Preparing an optical drive movable arm:
the method comprises the following steps: light-driven flexible film cutting
The light-driven flexible film prepared in example 4 of the present invention was cut into a sheet of 10mm by 15mm by simple cutting, and then rolled into a cylindrical shape using a capillary tube having a diameter of 1mm as a photosensitive joint portion.
Step two: application of light-driven flexible film to light-driven movable arm
The device is mainly composed of an upper arm and a lower arm of a happy and tall person; the two ends of the cylindrical film are adhered between the upper arm and the lower arm of the lego by glue, and the weight of the lower arm of the lego is about 70 +/-5 mg. The middle of the upper arm and the lower arm is exposed and leaks about 5-10 mm of films, the partial films are stretched up and down to be regulated according to different directions, the right arm is stretched up and down in the front-back direction to be regulated, and the left arm is stretched up and down in the left-right direction to be regulated, so that the optical drive movable arm is manufactured. The light intensity is 500 +/-50 mW/cm2And a part of the wide surface of the film is irradiated and stretched by using a wave band between 365nm and 455nm to realize reversible light-driven arm movement at different angles.
FIG. 4 shows that the light-activated movable arm prepared in this example is at 500. + -. 50mW/cm at room temperature2Photograph of reversible arm bending under light intensity of 455 nm. As can be seen from the figure: the photosensitive cylindrical film as a joint is in a state of being off-vertical in an initial state, and when a 455nm light source is irradiated from the side of the left arm (an arrow indicates an irradiation position), it is then bent leftward; when the 455nm light source is illuminated from directly in front of the right arm, it then bends straight ahead. Both light bending directions can recover the initial vertical state of the photosensitive joint through the irradiation of 455nm light in the opposite direction, and the photosensitive joint is shown to be driven by reversible lightApplication in line driving.
Example 6
Preparation of light-driven butterfly
The method comprises the following steps: cutting of light-driven flexible film
The light-driven flexible film prepared in the embodiment 4 of the invention is cut into the size of 15mm multiplied by 10mm by simple cutting, and is rolled into a cylinder shape by a capillary tube with the diameter of 1 mm;
step two: light-driven flexible film applied to light-driven butterfly drum wings
The butterfly wing adopts light gauze, wherein two ends of the cylindrical membrane are adhered to the base part of the butterfly wing, the middle part of the cylindrical membrane is exposed with a membrane of about 5 +/-3 mm, and the part of the membrane is stretched up and down in a direction parallel to the wing when the butterfly wing is laid flat so as to be regularized. The light intensity is 500 +/-50 mW/cm2And irradiating and stretching part of the wide surface of the film by using a wave band between 365nm and 455nm to realize the combination and opening of the butterfly wings similar to dancing.
FIG. 5 shows that the light-driven butterfly prepared in this example is at room temperature, 500. + -. 50mW/cm2Photos of wings dancing under 455nm illumination with light intensity; as can be seen from the figure: the butterfly wings are in a flat state, when the light irradiates right above the connecting film (arrows indicate light irradiation positions), the butterfly wings immediately bulge towards the light to be in a vertical state, the butterfly wings can restore the initial state after being irradiated reversely, and the application of the butterfly wings in the aspect of driving an actuator by reversible light is demonstrated.
Example 7
Preparation of optically driven switch
The method comprises the following steps: cutting of light-driven flexible film
The light-driven flexible film prepared in the embodiment 4 of the invention is cut into two pieces with the size of 15mm multiplied by 10mm through simple cutting, and is rolled into a cylinder shape by a capillary with the diameter of 1 mm;
step two: application of light-driven flexible film to light-driven switch
Stretching the film up and down at the position of 5mm from the two ends of the photosensitive film, wherein the stretched wide surface is a light irradiation surface, the two ends are bonded with tinfoil connected with a switch passage by common glue, and the two surfaces of the tinfoil are bonded with a sectionA cylindrical membrane. And under the condition of electrifying, the light intensity is 500 +/-50 mW/cm2The stretched film is partially irradiated with light in a wavelength range of 365nm to 455nm, and the film is shrunk and bent to light, and then a circuit is connected to turn on a red light.
FIG. 6 shows the optical switch prepared in this example at room temperature, 500. + -. 50mW/cm2The circuit is switched on under the light intensity of 455nm illumination, and a picture of a red light is lightened. As can be seen from the figure: the two parts of the control switch for connection and disconnection are both made of simple tinfoil paper, wherein two partially stretched photosensitive films are adhered to two sides of one part of the tinfoil paper, when 455nm light irradiates the stretched photosensitive films (arrows indicate illumination positions), light bending is immediately generated, namely, a circuit is connected, and the lamp is on. When the light is reversely irradiated, the light can be reversely irradiated, and the application of the light to the reversible light-driven actuator is shown.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (10)
1. The light-driven flexible film based on the salicylaldehyde Schiff base is characterized by being made of a salicylaldehyde Schiff base doped flexible high polymer material.
2. The salicylaldehyde schiff base-based light driven flexible film of claim 1, wherein: the molecular formula of the salicylaldehyde Schiff base is shown as the formula (I):
wherein R is1H, F or Br; r2Is composed of
3. The salicylaldehyde schiff base-based light driven flexible film of claim 1, wherein: the mass ratio of the salicylaldehyde Schiff base to the high polymer material is 1: 8-15.
4. The salicylaldehyde schiff base-based light driven flexible film of claim 1, wherein: the high polymer material is PET, and the average molecular weight of the PET is 2-3 multiplied by 104The ratio of the weight average molecular weight to the number average molecular weight is 1.5 to 1.8.
5. A method for preparing a salicylaldehyde Schiff base-based light driven flexible film according to any one of claims 1 to 4, comprising the following steps:
(1) preparing a mixed solution:
dissolving salicylaldehyde Schiff base and a high polymer material in a toluene solution, stirring and dissolving at a certain temperature, and preparing a mixed solution;
(2) preparation of light-driven flexible film based on salicylaldehyde Schiff base
After a substrate is pretreated, coating a sacrificial layer on the surface of the substrate, coating the mixed solution prepared in the step (1) on the surface of the sacrificial layer at a certain temperature, drying to form a light-driven thin film layer, transferring the substrate into a solvent to enable the light-driven thin film layer to fall off, and drying to obtain the light-driven flexible film based on the salicylaldehyde Schiff base.
6. The method of preparing a salicylaldehyde schiff base-based light driven flexible film of claim 5, wherein: in the step (1), the total mass concentration of the salicylaldehyde Schiff base and the high polymer material in the toluene solution is 60-70 mg/mL, and the salicylaldehyde Schiff base and the high polymer material are stirred and dissolved at the temperature of 45-65 ℃.
7. The method of preparing a salicylaldehyde schiff base-based light driven flexible film of claim 5, wherein: in the step (2), the sacrificial layer is a water-soluble layer, the water-soluble layer is a PEDOT PSS layer or a sodium carboxymethyl cellulose layer, and the solvent is water; the thickness of the sacrificial layer is 100-300 nm; the coating temperature of the mixed solution is 45-65 ℃.
8. The method of preparing a salicylaldehyde schiff base-based light driven flexible film of claim 7, wherein: in the step (2), after the surface of the substrate is coated with the sacrificial layer, the substrate is annealed for 5-10min at the temperature of 150 +/-30 ℃, and then the mixed solution is coated.
9. The method of preparing a salicylaldehyde schiff base-based light driven flexible film of claim 5, wherein: in the step (2), the thickness of the light-driven flexible film based on the salicylaldehyde Schiff base is 100-300 μm.
10. Use of the salicylaldehyde schiff base-based light driven flexible film according to any one of claims 1 to 4 or the salicylaldehyde schiff base-based light driven flexible film prepared by the preparation method according to any one of claims 5 to 9, characterized in that: the light-driven flexible membrane based on the salicylaldehyde Schiff base is prepared into a light-driven flexible actuator, and is applied to the fields of light-driven lightweight micro equipment, micro light energy-mechanical energy conversion equipment and light-driven movable arms, wherein the light-driven flexible actuator is 500 +/-50 mW/cm at room temperature2The rapid deformation can be realized under the illumination of 365 nm-455 nm wave band of intensity.
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| CN112623164A (en) * | 2020-12-26 | 2021-04-09 | 福州大学 | Visible light driven jellyfish-like micro swimming soft robot and method thereof |
| CN113697075A (en) * | 2021-09-10 | 2021-11-26 | 四川大学 | Controllable robot based on photosensitive intelligent composite material |
| CN115991918A (en) * | 2022-12-07 | 2023-04-21 | 武汉大学 | Photo-thermal hydrogel material based on salicylaldehyde Schiff base, and preparation method and application thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112625488A (en) * | 2020-12-17 | 2021-04-09 | 青岛橡六胶管有限公司 | Thermosensitive material, preparation method thereof and rubber tube |
| CN112623164A (en) * | 2020-12-26 | 2021-04-09 | 福州大学 | Visible light driven jellyfish-like micro swimming soft robot and method thereof |
| CN113697075A (en) * | 2021-09-10 | 2021-11-26 | 四川大学 | Controllable robot based on photosensitive intelligent composite material |
| CN113697075B (en) * | 2021-09-10 | 2022-11-01 | 四川大学 | Controllable robot based on photosensitive intelligent composite material |
| CN115991918A (en) * | 2022-12-07 | 2023-04-21 | 武汉大学 | Photo-thermal hydrogel material based on salicylaldehyde Schiff base, and preparation method and application thereof |
| CN115991918B (en) * | 2022-12-07 | 2024-03-19 | 武汉大学 | Photo-thermal hydrogel material based on salicylaldehyde Schiff base, and preparation method and application thereof |
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