CN111308610A - Photoresponsive polymer optical fiber and preparation method and application thereof - Google Patents
Photoresponsive polymer optical fiber and preparation method and application thereof Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
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- C08G75/02—Polythioethers
- C08G75/04—Polythioethers from mercapto compounds or metallic derivatives thereof
- C08G75/045—Polythioethers from mercapto compounds or metallic derivatives thereof from mercapto compounds and unsaturated compounds
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- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
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- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/35—Optical coupling means having switching means
- G02B6/3502—Optical coupling means having switching means involving direct waveguide displacement, e.g. cantilever type waveguide displacement involving waveguide bending, or displacing an interposed waveguide between stationary waveguides
- G02B6/3504—Rotating, tilting or pivoting the waveguides, or with the waveguides describing a curved path
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Abstract
The invention discloses a photoresponse polymer optical fiber and a preparation method and application thereof, belonging to the field of optical fiber communication and sensing. The photoresponsive polymer optical fiber takes the liquid crystal elastomer with uniaxial orientation as an inner-layer fiber core, takes the liquid crystal elastomer doped with photoresponsive groups as an outer cladding, and the outer cladding can sense optical signals transmitted in the inner-layer fiber core and respond to volume deformation of specific wavelength so as to change the whole optical path. The deflection degree of the optical path is influenced by the structural parameters of the optical fiber, the wavelength and the intensity of the transmitted light. The photoresponse polymer optical fiber can be used for preparing a self-identification mobile optical fiber type optical switch and is applied to the fields of sensing, detection, filtering and the like.
Description
Technical Field
The invention relates to an optical fiber mobile optical switch technology, in particular to an optical fiber which can generate mechanical deformation when transmitting light with specific wavelength, a preparation method and application thereof, belonging to the field of optical fiber communication and sensing.
Background
Optical fiber technology brings revolutionary breakthrough and development to the communication industry, but the explosive growth of communication service demands also puts new demands on the management and control technology of optical fiber networks. The optical switch is an optical path conversion device, can realize the switching connection of optical paths, and has important application in the fields of optical cross connection systems, optical fiber transmission, testing and the like.
The types of optical switches can be classified into conventional mechanical optical switches, micro-mechanical optical switches, thermo-optical switches, liquid crystal optical switches, etc. according to the principle, and can be mainly classified into optical fiber movement type and optical path modulation type (using optical elements: mirrors, prisms, lenses, etc.) according to the mode of action. The development focus is mainly on micro-electro-mechanical systems, which have the advantages of small volume, high integration level, low loss and capability of processing signals of any wavelength, but the response process needs to undergo conversion from optical signals to electrical signals to optical signals.
In the optical path system, direct optical-mechanical conversion can be realized by doping a light response material, utilizing a light response coating and the like, the position of the optical path is adjusted, and the optical path system is mostly applied to an optical sensing system. The optomechanical deformation of the quartz optical fiber is limited by the high modulus of inorganic materials, the deformation degree is small, and most deflection angles are smaller than 1 degree. The deflection angle of the optical path can be increased to more than 20 degrees by using the polymer optical fiber, particularly, the hydrogel or the liquid crystal polymer and other materials with stimulation response properties.
At present, no research is available for directly applying polymer optical fibers with photoresponsiveness to optical switches. Related reports show that the liquid crystal elastomer optical fiber doped with gold nanoparticles is designed by Ryan C.Hayward et al, but the distribution of the gold nanoparticles cannot be precisely controlled in the doping process, the photothermal effect of the optical fiber has sensitivity only in a 500-plus 600-nanometer waveband, and the increase of optical loss coefficient caused by doping also limits the application of the optical fiber as an optical switch in an optical transmission system.
Disclosure of Invention
The invention aims to provide a polymer optical fiber which has the performance of light regulation and control of direction and is sensitive to wavelength and a preparation method thereof. The optical fiber has the advantages of large deflection angle, excellent wavelength selectivity and lower optical loss, can self-identify the transmitted optical signal and make optical path adjustment, can be used for preparing an optical fiber mobile optical switch which generates self-response to the transmitted optical signal, and is applied to the fields of optical path adjustment, filtering, optical monitoring and the like.
The polymer optical fiber with the light response performance provided by the invention consists of a side light-emitting type inner-layer fiber core and a light-responding outer cladding layer, wherein the inner-layer fiber core is a side light-emitting type optical fiber formed by uniaxially orienting the elements of the liquid crystal elastomer through stretching; the photoresponsive outer cladding layer is a liquid crystal elastomer containing photoresponsive groups, wherein the photoresponsive groups can generate photochemical reaction (such as cis-trans isomerism and the like) in a specific response waveband, and the outer cladding layer is subjected to macroscopic volume deformation through intermolecular synergism of liquid crystals.
The inner core material is a liquid crystal elastomer. Under mechanical stretching, the liquid crystal elements are axially oriented to form the side-emitting polymer optical fiber with good light conduction performance, high transparency and low light loss rate. The tensile strain of the liquid crystal elastomer constituting the core of the inner layer is 25% to 1000%. The recognizable transmission light wavelength range of the optical fiber is 250-1000 nanometers. Preferably, the inner-layer fiber core is cylindrical and has a diameter of 5-5000 microns.
The light responsive outer cladding layer uses a liquid crystal elastomer molecular system which is the same as the fiber core of the inner layer, so that the two layers are connected tightly and firmly. The photoresponsive outer cladding can generate large-amplitude light stimulation deformation, the deformation is reversible and repeatable, and the wavelength selectivity is achieved.
The optically responsive outer cladding is applied to the surface of the inner core as desired, typically not completely surrounding the inner core, but over a portion of the surface of the core. Preferably, in the cross section direction of the optical fiber, the corresponding central angle of the coating area is 1-180 degrees, and the thickness is 1-1000 microns; in the long axis direction of the optical fiber, the outer cladding layer may be as long as the inner core or may be coated only in a specific region.
The Liquid Crystal Elastomer (LCEs) is obtained by connecting Liquid crystal primitives to a flexible polymer cross-linked network through covalent bonds, has the electro-optical property of Liquid crystal molecules and the elastic property of rubber, and has the characteristics that the glass transition temperature is lower than room temperature, the elastic modulus range is 0.1-10 MPa, and the like, and can generate stimulus response deformation. Common mesogens include, but are not limited to, benzene, biphenyl, aromatic ester, aramid, phenyl schiff base and its derivatives, which have the following molecular structures:
wherein R is1Has a molecular structure of
M is an integer of 0 to 10, M is H or C1-C6Alkyl groups of (a); r2Including but not limited to the same as R1Group of the structure, H, hydroxy (OH), C1-C6Alkyl, Cyano (CN), Nitro (NO)2) Amino (NH)2) And a halogen atom. When R is2And R1When the structures are the same, both ends of the liquid crystal element are connected into a high molecular system through covalent bonds and used as a cross-linking agent; when R is2When the other end group is present, the mesogen is present as a side group in the polymer system. The flexible polymer system should have the structure capable of reacting with R1And/or R2The double bond in (1) includes, but is not limited to, a silicon hydrogen bond, a thio group, an amine group, and the like. The crosslinking density of the liquid elastomer is 2-50%, and the properties of the liquid elastomer such as glass transition temperature, modulus and the like can be influenced by increasing the crosslinking proportion, so that the opto-mechanical response amplitude of the optical fiber is influenced.
Typical liquid crystalline elastomers include, but are not limited to, liquid crystalline elastomers of siloxane systems, thiol-double bond systems, primary amine-double bond systems.
The photoresponsive groups in the photoresponsive outer cladding layer can be connected to the liquid crystal elastomer network (including side groups or cross-linking agents) through covalent bonds, and can also be uniformly dispersed in the liquid crystal elastomer grid in the form of small molecules.
The photoresponsive group comprises but is not limited to a group containing azobenzene, azopyridine, azotolane, chalcone, cinnamate and the like and derivatives thereof, and the molecular structural general formula is as follows:
R3、R4representing the end group and the molecular chain structure thereof connected with the photoresponsive group. Wherein the molecular chain includes but is not limited to carbon chain, alkoxy chain, ester chain, carbon nitrogen chain, amide chain; the end groups include but are not limited to H, OH, C1-C6Alkyl, CN, NO2、NH2Halogen atoms, carbon-carbon double bonds, thio groups. When R is3、R4When the end groups are all structures (such as carbon-carbon double bonds) capable of forming covalent bonds with the liquid crystal elastomer network, the photoresponsive groups exist in the form of a cross-linking agent; when R is3、R4When one of the end groups is a structure (such as a carbon-carbon double bond) capable of forming a covalent bond with the liquid crystal elastomer network, the photoresponsive group exists in a side group form; when R is3、R4When none of the terminal groups of (a) can form a covalent bond with the liquid crystal elastomer network, the photoresponsive group is dispersed in the form of small molecules in the crosslinked network of the liquid crystal elastomer. The photoresponsive groups have different absorption spectra, and the response wavelength of the optical fiber can be changed by selecting the proper photoresponsive groups to meet various requirements.
The light responsive polymer optical fiber provided by the invention can regulate and control the direction and is sensitive to the wavelength, and the preparation method comprises the following steps:
1) preparing a precursor mixture (containing a photoinitiator) for reacting to form a liquid crystal elastomer prepolymer, filling the precursor mixture into a cylindrical mold, standing under a certain condition to form the prepolymer, and taking out the prepolymer to be an inner-layer fiber core material;
2) preparing a precursor mixture (containing a photoinitiator) of a liquid crystal elastomer prepolymer containing photoresponse groups, coating the precursor mixture on the surface of the inner-layer core material obtained in the step 1) according to design requirements, and standing under certain conditions to form a prepolymer;
3) stretching the liquid crystal elastomer prepolymer obtained in the step 2) for a certain length integrally, and irradiating the prepolymer by utilizing light with a specific wavelength to initiate a crosslinking reaction to form a liquid crystal elastomer so as to obtain the polymer optical fiber with the light response performance.
The liquid crystal elastomer in the step 1) and the step 2) is preferably a liquid crystal elastomer of a siloxane system, a mercaptan-double bond system and a primary amine-double bond system, and the precursor mixture for forming the liquid elastomer prepolymer comprises a liquid crystal element, a chain extender and a cross-linking agent, and the typical structures of the liquid crystal elastomer prepolymer are as follows:
(1) siloxane system:
(2) thiol-double bond system:
(3) primary amine-double bond system:
wherein R is5Is H, C1-C6Alkyl groups of (a); r6Including but not limited to H, OH, C1-C6Alkyl, CN, NO2、NH2A halogen atom; n is1,n2Is an integer of 0 to 10.
The inner diameter of the cylindrical die used in the step 1) is preferably 5-5000 micrometers, and corresponds to the diameter of the fiber core of the inner layer of the optical fiber.
In the step 2), the thickness of the outer cladding is 1-1000 microns, and the bending angle of the optical fiber under the light-transmitting condition can be accurately controlled by adjusting the doping concentration containing the photoresponse group, the thickness and the form of the outer cladding.
In the step 3), the tensile strain of the optical fiber is 25% -1000%, the longer the tensile length is, the higher the orientation degree of the liquid crystal element is, and the lower the loss rate of the optical fiber is. The elongation at break is influenced by the degree of crosslinking of the prepolymer, the lower the degree of crosslinking, the longer the tensile length. The light wavelength in the photocrosslinking step is consistent with the initiating wavelength of the photoinitiator in the step 1) and the step 2), aiming at different photoresponse groups, the photoinitiator is selected so that the wavelength of the photoinitiation polymerization of the photoinitiator avoids the response wavelength of the used photoresponse group, the common ultraviolet initiator is HHMP and Irgacure 819, and the visible photoinitiator is a titanocene system.
The optical fiber with the light modulation and control directional performance prepared by the invention can realize the identification of the wavelength of the light transmitted by the optical fiber, change the corresponding form and adjust the light path. When the wavelength of the transmitted light in the inner-layer fiber core is consistent with the response wavelength of the outer cladding layer, the photoresponse group in the outer cladding layer generates photochemical reaction (such as cis-trans isomerism) under the light stimulus, and the orientation order of the liquid crystal is changed through the molecular synergistic action among liquid crystal elements, so that the outer cladding layer generates volume change (shrinkage or expansion).
Further, since the inner core and the outer cladding are substantially identical in liquid crystal elastomer system, they form covalent chemical bonds (types are determined according to the liquid crystal elastomer system, including sulfur-carbon single bond, silicon-carbon single bond, carbon-carbon single bond, etc.) during the pre-polymerization of the outer cladding, so that their connection is tight and firm. Therefore, when the outer cladding layer undergoes volume change (contraction or expansion), the generated force also acts on the inner core layer, and in combination with the asymmetric cladding design, the whole optical fiber undergoes large-angle deflection, so that the propagation path of the optical path is changed. As shown in fig. 1, the optical fiber with asymmetric cladding design can self-identify the transmitted optical signal, and when the transmitted optical wavelength is consistent with the response band of the outer cladding, the optical fiber deflects and the optical path is adjusted. The deflection angle of the optical fiber is influenced by the structural design of the optical fiber, the wavelength and the intensity of transmitted light, and the deflection angle range is 1-90 degrees.
Further, for any specific preparation condition, including the liquid crystal elastomer structure, the content of photoresponsive groups, the thicknesses of the inner fiber core and the outer cladding, the outer cladding pattern and the like, the deformation degree of the obtained optical fiber corresponds to the wavelength and the intensity of transmitted light. Therefore, the optical fiber moving type optical switch can be designed, which takes the optical fiber provided by the invention as an input end and takes the common optical fiber arranged at a specific position as an output end, can automatically identify the passing optical signal, make optical response, keep an initial state or deflect a certain angle, and transmit light to a corresponding optical path. Fig. 2 shows a schematic diagram of an optical fiber moving type optical switch, in which a plurality of common optical fibers are fixed at an initial optical path position and a deflected optical path position (a plurality of optical paths are shown in fig. 2, two deflected optical path positions are shown) of an input optical fiber as output optical fibers, the number of the output optical paths may be 1 to 20, and the output optical fibers correspond to different wavelengths and different intensities of transmission optical signals. The optical switch can be applied to sensing, detection, filtering and the like.
Drawings
FIG. 1 is a schematic representation of the deflection of an optical fiber of the present invention in the transmission of an optical signal in a response band.
Fig. 2 is a schematic diagram of the working principle of the self-identification optical switch of the present invention, and the number of output signals can be more according to the wavelength and intensity variation.
Fig. 3 shows the change in form of the inner core of the optical fiber in example 1 before and after stretching, and the optical fiber is colorless and transparent after stretching and can be used as a side-emitting optical fiber.
FIG. 4 shows the uniaxial orientation of mesogens in the core of the inner layer of the optical fiber prepared in example 1.
FIG. 5 is a graph showing the response of the optical fiber prepared in example 2 to a red wavelength band, the optical fiber self-identifying the transmitted optical signal adjusting the optical path when the outer cladding layer is present; the optical path does not change when the outer cladding is absent.
Detailed Description
The technical means and effects adopted by the invention will be further described with reference to the specific embodiments, and the following two parts are divided: preparing a wavelength sensitive type photoinduced deformation optical fiber; the design and effect of the optical switch for self-identifying optical signals. However, it should not be understood that the subject matter described in the present invention is limited to the following examples, and any technique realized based on the present disclosure is within the scope of the present invention.
Example 1
1. Preparation of the photoresponsive fiber:
taking 300mg of mesogen RM257, 72mg of chain extender EDDET, 14.4mg of cross-linking agent PETMP and 3mg of visible light initiator Irgacure 784, uniformly mixing, adding 90 mu L of dichloromethane serving as a solvent, placing in a 70 ℃ oven, preserving heat for 5 minutes to form a uniform and stable solution, and cooling to room temperature. Adding 30 mu L of 2 wt% DPA dichloromethane solution, oscillating, mixing uniformly, rapidly adding into a cylindrical die with the inner diameter of 1mm, and standing at room temperature for 12 hours to obtain the final productAnd (3) performing prepolymer. The mold was opened to give a white opaque cylinder which was stretched to a strain of 150% and illuminated at 460nm for 10 minutes (intensity 50 mW/cm)2) As shown in FIG. 3, a transparent cylindrical liquid crystal elastomer can be obtained, which can be used as the core of the inner layer of the optical fiber.
Preparation of outer cladding layer with 285mg of mesogen RM257 and 12.3mg of photoresponsive group 2M6Az, 72mg of chain extender EDDET, 14.4mg of cross-linking agent PETMP, 3mg of visible light initiator Irgacure 784 (photoresponsive group 2M)6Az ratio is RM257 and 2M65% of the total molar amount of Az, and ensuring that the crosslinking density of the outer cladding layer and the inner core layer is consistent), adding 90 mu L of dichloromethane serving as a solvent after uniformly mixing, placing in a 70 ℃ oven, preserving the temperature for 5 minutes to form a uniform and stable solution, cooling to room temperature, adding 30 mu L of 2 wt% DPA dichloromethane solution, coating on one side of the unstretched inner core layer after uniformly oscillating, wherein the coating width is 0.3mm, the thickness is 20 mu m, and standing at room temperature for 12 hours to form a prepolymer. The resulting composite was stretched to a strain of 150% and illuminated at 460nm for 10 minutes (light intensity 50 mW/cm)2)。
In the stretched and photo-crosslinked liquid crystal elastomer optical fiber, the mesogen exhibits good uniaxial orientation, as shown in fig. 4, when observed under a polarizing microscope, the long axis direction of the optical fiber is 45 degrees to both a polarizer and an analyzer of the microscope, the optical fiber is a bright field; when the long axis direction of the optical fiber is parallel to the polarizer or analyzer of the microscope, the optical fiber is a dark field. Thus, the outer cladding does not respond when light in the visible or infrared band passes through the core of the inner layer of the fiber; when 300nm-400nm ultraviolet light or ultraviolet light passes through the fiber core of the inner layer of the optical fiber, the outer cladding layer is illuminated by the side light-emitting optical fiber, and the overall orientation orderliness of the outer cladding layer is reduced by the cis-trans isomerism of the azobenzene group and the synergistic effect between the liquid crystal elements, so that the length shrinkage is generated, the fiber core of the inner layer is influenced, and the lateral bending of the whole optical fiber is represented.
2. Preparing a self-identification transmission signal optical switch:
the optical fiber prepared by the method is used as an input optical fiber, and a normal optical fiber is placed at the initial optical path position and the optical path position after the optical fiber is deformed to be used as an output optical fiber, so that the optical switch capable of automatically identifying optical signals can be obtained. The effect is briefly described as follows: when the wavelength of the input optical signal is adjusted from a visible light waveband to an ultraviolet waveband, the optical switch automatically identifies that the input signal is changed, and changes the optical path in a mode of deformation of the optical fiber, so that the output of the optical signal is changed.
When light of a response waveband passes, the bending degree of the optical fiber is positively correlated with light intensity, and the multi-output optical switch which is sensitive to light wavelength and light intensity can be prepared.
Example 2
1. Preparation of the photoresponsive fiber:
preparing an inner-layer fiber core: taking 300mg of liquid crystal elementary RM257, 72mg of chain extender EDDET, 14.4mg of cross-linking agent PETMP and 3mg of ultraviolet initiator HHMP, uniformly mixing, adding 90 mu L of dichloromethane serving as a solvent, placing in a 70 ℃ oven, preserving heat for 5 minutes, forming a uniform and stable solution, and cooling to room temperature. Adding 30 mu L of 2 wt% DPA dichloromethane solution, oscillating, mixing uniformly, quickly adding into a cylindrical die with the inner diameter of 1mm, and standing at room temperature for 12 hours to form a prepolymer.
Preparing an outer coating layer: 285mg of liquid crystal elementary RM257, 8.2mg of photoresponsive group DR1A, 72mg of chain extender EDDET, 14.4mg of cross-linking agent PETMP and 3mg of ultraviolet initiator HHMP (the photoresponsive group DR1A accounts for 5% of the total molar amount of RM257 and DR1A, and the cross-linking density of the outer cladding layer and the inner core layer is ensured to be consistent), 90 mu L of dichloromethane serving as a solvent is added after uniform mixing, the mixture is placed in a 70 ℃ oven and is kept warm for 5 minutes to form a uniform and stable solution, the solution is cooled to room temperature, 30 mu L of 2 wt% DPA dichloromethane solution is added, the solution is evenly stirred and coated on one side of the core layer of the unstretched inner layer, the coating width is 0.3mm, the thickness is 20 mu m, and the prepolymer is formed after the. Stretching the obtained compositeThe strain is 150%, and the light is irradiated for 10 minutes at the wavelength of 365nm (the light intensity is 50 mW/cm)2)。
The photoresponsive group used in the embodiment is sensitive to visible light in a wave band of 400nm-600nm, so when visible light passes through the wave band in the fiber core of the inner layer of the optical fiber, the cis-trans isomerism of the azobenzene group in the outer cladding layer is matched with the synergistic effect among the liquid crystal elements to reduce the whole orientation order of the outer cladding layer, so that the length shrinkage is generated, the fiber core of the inner layer is influenced, and the lateral bending of the whole optical fiber is represented. The actual effect is shown in fig. 5, and the optical path of the comparative optical fiber without outer cladding is not deflected when visible light passes through the wavelength band.
2. Preparing a self-identification transmission signal optical switch:
the design idea and the self-response optical path conversion effect are the same as those of embodiment 1.
The foregoing is directed to embodiments 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. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (13)
1. A polymer optical fiber with light response performance comprises a side light emitting type inner layer fiber core and a light response outer cladding layer, wherein the inner layer fiber core is formed by stretching and uniaxially orienting the elementary units of a liquid crystal elastomer; the photoresponsive outer cladding layer is a liquid crystal elastomer containing photoresponsive groups, wherein the photoresponsive groups can generate photochemical reaction in a specific response waveband, and the outer cladding layer is subjected to macroscopic volume deformation through intermolecular synergistic action of liquid crystals.
2. The polymer optical fiber according to claim 1, wherein the core of the inner layer is formed of a liquid crystal elastomer having a tensile strain of 25% to 1000%, and the optical fiber can recognize a transmission light wavelength in a range of 250 to 1000 nm.
3. The polymer optic fiber of claim 1, wherein the inner core is cylindrical and has a diameter of 5 to 5000 microns.
4. The polymer optical fiber according to claim 1, wherein the light responsive over cladding layer is coated on a part of the surface of the inner core layer, and the coated area is at an angle of 1 to 180 ° with respect to a center of the circle and has a thickness of 1 to 1000 μm in the cross-sectional direction of the optical fiber; in the long axis direction of the optical fiber, the photoresponsive outer cladding layer can be as long as the inner core or coated only in a specific region.
5. The polymer optic fiber of claim 1, wherein the photoresponsive outer cladding layer employs the same liquid crystal elastomer molecular system as the core of the inner layer, and the photoresponsive groups are covalently bonded to the liquid crystal elastomer network or are uniformly dispersed in the form of small molecules in the liquid crystal elastomer network.
6. The polymer optical fiber according to claim 1, wherein the liquid crystalline elastomer is an elastomer obtained by covalently bonding mesogens to a cross-linked network of a flexible polymer, and has a glass transition temperature lower than room temperature and an elastic modulus in the range of 0.1 to 10 Mpa.
7. The polymer optic fiber of claim 1, wherein the mesogen is selected from one or more of the following molecular structures:
wherein R is1Is composed of
M is an integer of 0 to 10, M is H or C1-C6Alkyl groups of (a); r2Is the same as R1Group of the structure, H, hydroxy, C1-C6Alkyl, cyano, nitro, amino or halogen atoms.
8. The polymer optic fiber of claim 1, wherein the photo-responsive groups are selected from one or more of the following groups of molecular structures:
R3、R4represents a terminal group and a molecular chain structure connected with the photoresponsive group; wherein the molecular chain includes but is not limited to carbon chain, alkoxy chain, ester chain, carbon nitrogen chain, amide chain; the end groups include, but are not limited to, H, hydroxy, C1-C6Alkyl, cyano, nitro, amino, halogen atom, carbon-carbon double bond, thio.
9. A method for manufacturing a polymer optical fiber having a photo-responsive property according to any one of claims 1 to 8, comprising the steps of:
1) preparing a precursor mixture for reacting to form a liquid crystal elastomer prepolymer, adding a photoinitiator, then pouring into a cylindrical mold, standing under a certain condition to form the prepolymer, and taking out the prepolymer as an inner-layer fiber core material;
2) preparing a precursor mixture of a liquid crystal elastomer prepolymer containing a photoresponse group, adding a photoinitiator, coating the photoinitiator on the surface of the inner-layer fiber core material obtained in the step 1) according to design requirements, and standing under certain conditions to form a prepolymer;
3) stretching the liquid crystal elastomer prepolymer obtained in the step 2) for a certain length integrally, and irradiating the prepolymer by using light with a specific wavelength to initiate a crosslinking reaction to form a liquid crystal elastomer so as to obtain the polymer optical fiber with the light response performance.
10. The method according to claim 9, wherein the precursor mixture of the liquid crystal elastomer prepolymer in the step 1) and the step 2) contains a compound represented by the following siloxane system, thiol-double bond system or primary amine-double bond system:
wherein R is5Is H, C1-C6Alkyl groups of (a); r6Including but not limited to H, hydroxy, C1-C6Alkyl, cyano, nitro, amino, halogen atoms; n is1,n2Is an integer of 0 to 10.
11. The method of claim 9, wherein the photoinitiator is a uv or visible photoinitiator.
12. An optical switch, wherein the polymer optical fiber with optical response performance of any claim 1 to 8 is used as an input end, and a common optical fiber arranged at a specific position is used as an output end to form an optical fiber moving type optical switch; the polymer optical fiber self-identification transmits optical signals, when the wavelength of the transmitted light is consistent with the light-responsive outer cladding response waveband of the polymer optical fiber, the optical fiber deflects, the optical path is adjusted, and the light is transmitted to the corresponding optical path.
13. The optical switch of claim 13, wherein a plurality of common optical fibers are fixed as output optical fibers at the initial optical path position and the deflected optical path position of the input polymer optical fiber, corresponding to different wavelengths and different intensities of the transmitted optical signals.
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