CN106772779B - Enhanced plastic optical fiber and preparation method thereof - Google Patents
Enhanced plastic optical fiber and preparation method thereof Download PDFInfo
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- CN106772779B CN106772779B CN201611224281.4A CN201611224281A CN106772779B CN 106772779 B CN106772779 B CN 106772779B CN 201611224281 A CN201611224281 A CN 201611224281A CN 106772779 B CN106772779 B CN 106772779B
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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
- G02B6/02033—Core or cladding made from organic material, e.g. polymeric material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00663—Production of light guides
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Abstract
The invention discloses an enhanced plastic optical fiber and a preparation method thereof. Meanwhile, the invention provides a method for preparing the graphene layer coated plastic optical fiber. The microwave technology capable of heating rapidly is combined with the microwave absorption characteristic of the graphene derivative, and simultaneously the high heat conduction capability of the graphene and the characteristic that the heat of the graphene layer is easy to exchange and transfer rapidly are combined, so that the graphene derivative coated on the surface of the plastic optical fiber can be converted into the graphene rapidly with low energy consumption, and the plastic optical fiber and the graphene material are facilitated to serve the society better.
Description
Technical Field
The invention belongs to the field of communication, and relates to an enhanced plastic optical fiber, namely, the temperature resistance and the attenuation resistance of the plastic optical fiber are improved by coating a graphene layer with good heat conduction capability and sealing capability. The invention also provides a preparation method of the plastic optical fiber coated by the graphene layer.
Background
With the rapid expansion of multimedia services such as Internet data communication, video on demand, video phones, video conferences and the like, higher requirements are put on the broadband and high-speed of physical networks, and the transmission networks from fiber to the home and from fiber to the desktop gradually replace the existing photoelectric mixed form to become the most ideal transmission network. In all-optical switching networks, the research of laying home-to-home optical fiber communication network technology using Plastic Optical Fiber (POF) in combination with quartz optical fiber has become a hot spot of the optical fiber communication technology research. The plastic optical fiber is equivalent to a symmetrical cable in cost in high-speed short-distance communication transmission, the transmission bandwidth can reach several GHz within the range of 100m, and the plastic optical fiber has the advantages of easiness in connection, good flexibility, easiness in bending and the like. The POF for communication is matched with the quartz optical fiber, the POF can play a role at the tail end (home integrated wiring) of the FTTH, and the difficult problem of access of last hundreds of meters can be solved. At present, the whole society advocates low-carbon construction, uses more environment-friendly plastic optical fiber, and is more competitive compared with copper cable products such as five-type wires. With the further speed increase of broadband construction in the global scope, the Fiber To The Home (FTTH) market prospect is wide, and the plastic optical fiber is one of the most suitable technical means. The intelligent household appliances (such as household PC, HDTV, telephone, digital imaging equipment, household safety equipment, air conditioner, refrigerator, sound system, kitchen appliance and the like) can be networked through the plastic optical fiber, so that the household automation and remote control management are realized, and the life quality is improved; through the plastic optical fiber, the networking of office equipment can be realized, if the computer networking can realize the computer parallel processing, the high-speed transmission of data between office equipment can greatly improve the working efficiency, realize teleworking etc.. However, at present, the improvement of the heat resistance and the reduction of the loss of the plastic optical fiber in practical application are the biggest obstacles for further popularization and application, and are also research hotspots in the field. At present, plastic optical fibers with temperature resistance up to 120 ℃ are obtained through continuous development and exploration, and further improvement of the heat resistance of the plastic optical fibers needs continuous efforts. The plastic optical fiber loss is related to the material structure such as carbon-hydrogen bond characteristics on one hand, and the mechanical loss on the other hand. Graded fluoroplastic fibers have been developed to reduce structure-dependent losses, but mechanical loss reduction measures are currently under investigation. In fact, the research shows that the coating of carbon on the surface of the quartz optical fiber can isolate the surface of the optical fiber from the outside by using a dense carbon film layer, thereby improving the mechanical fatigue loss and the loss of hydrogen molecules of the optical fiber. However, carbon coatings tend to require high temperature operation and are therefore currently only suitable for high temperature resistant silica optical fibers and are not used for more severe loss and more critically reduced plastic optical fibers. Therefore, there is a need to develop new techniques to make plastic optical fibers advance in improving heat resistance and reducing mechanical loss. Therefore, the application firstly proposes that the plastic optical fiber is coated with the graphene layer internationally, so that the high heat-conducting property of the graphene is utilized to improve the heat-resistant property of the plastic optical fiber, and the plastic optical fiber is promoted to better serve the society. The graphene layer coated plastic optical fiber is prepared by coating a graphene derivative layer on a plastic optical fiber to form a composite plastic optical fiber, then enabling the composite plastic optical fiber to move in a non-oxidizing atmosphere at a set speed, enabling the composite plastic optical fiber to pass through a microwave heating zone, rapidly heating the graphene derivative layer in a limited short time by using microwaves by utilizing the microwave absorption capacity of the graphene derivative, and then rapidly cooling the graphene layer coated plastic optical fiber. The application of the application can help the plastic optical fiber to be popularized and applied better in society.
Disclosure of Invention
The technical problem is as follows: the invention aims to provide an enhanced plastic optical fiber and a preparation method thereof. Meanwhile, the application provides a method for preparing the graphene layer coated plastic optical fiber. The application of the invention is beneficial to better social service of plastic optical fibers and graphene materials.
The technical scheme is as follows: according to the enhanced plastic optical fiber, the surface of the plastic optical fiber is coated with the graphene layer.
The carbon content in the graphene layer is greater than 90%.
The invention relates to a preparation method of an enhanced plastic optical fiber, wherein the surface of the plastic optical fiber is coated with a graphene layer by the following method: firstly, preparing a graphene derivative solution, then coating the graphene derivative solution on the surface of a selected plastic optical fiber to form a composite plastic optical fiber, then enabling the composite plastic optical fiber to move through a microwave heating zone at a set speed under a set atmosphere, enabling the graphene derivative on the surface of the composite plastic optical fiber to be subjected to microwave heating treatment, enabling the composite plastic optical fiber to leave the microwave heating zone and be cooled, and then performing extrusion treatment to obtain the composite plastic optical fiber with the surface coated with a graphene layer.
The graphene derivative refers to an oxide of graphene, and includes graphene oxide, reduced graphene oxide and graphene edge derivatives.
The microwave heating treatment refers to a reaction that the graphene derivative absorbs microwaves, so that the temperature is raised, oxidized graphene is reduced, and the graphene edge derivative is subjected to edge functional group removal.
The composite plastic optical fiber is heated at a set speed through a microwave heating area, and the heating time is controlled according to the size of the microwave heating area.
The microwave heating treatment time is less than 30 seconds.
The set atmosphere refers to inert atmosphere, reducing atmosphere or vacuum state; the inert atmosphere refers to a gas which does not react with the graphene derivative, such as nitrogen, helium, argon; the reducing atmosphere refers to a gas containing reduced graphene derivatives, such as hydrogen, alcohols, and alkanes; the vacuum state refers to the air pressure of less than 4 KPa.
The plastic optical fiber leaves the microwave heating zone and is cooled by means of a cold atmosphere or additional application of a cold fluid.
The process of microwave heating and then plastic optical fiber leaving the microwave heating zone and being cooled may be repeated multiple times.
The graphene derivative solution is coated on the surface of a selected plastic optical fiber to form a composite plastic optical fiber, then the composite plastic optical fiber moves at a set speed under a set atmosphere and passes through a microwave heating zone to be heated by microwaves, then the composite plastic optical fiber leaves the microwave heating zone and is rapidly cooled, and then a series of processes of extrusion treatment can be repeated, namely the graphene derivative can be coated for multiple times to obtain a thickened graphene layer.
The coating comprises dip coating, spray coating, brush coating, foam coating, layer-by-layer assembly coating and contact coating.
Has the advantages that: compared with the prior art, the invention has the following advantages:
according to the graphene-coated enhanced plastic optical fiber, the excellent heat conduction capability of graphene and the good surface coating performance of a two-dimensional material are used for modifying the plastic optical fiber for the first time, so that the heat resistance which needs to be improved urgently is improved, and meanwhile, the graphene derivative is coated on the surface of the plastic optical fiber to form the composite plastic optical fiber by combining the characteristic that the graphene strongly absorbs microwaves and the characteristic that the microwaves are instantly turned on, namely, rapidly heated, and then moves at a set speed, the graphene derivative layer is intensively heated by the microwaves for a short time in a microwave heating area, and then the graphene derivative layer is rapidly cooled, so that the damage of conventional long-time high-temperature heating to the plastic optical. The graphene layer-coated plastic optical fiber is obtained by selectively treating the graphene derivative layer at high temperature by utilizing the excellent heat-conducting property and coating property of the two-dimensional graphene and combining the microwave absorption capacity of the graphene derivative, and has the characteristics of improved plastic optical fiber performance and rapid and environment-friendly preparation method, so that the plastic optical fiber is beneficial to better social service.
Drawings
FIG. 1 is a schematic diagram of a process for preparing an optical fiber of reinforced plastic.
FIG. 2 is a schematic view of plastic optical fiber passing around a metal baffle via a guide wheel.
The figure shows that: the device comprises a plastic optical fiber 1, an immersion pool 2, a solution 2a, a liquid squeezing roller 3, a drying room 4, a front temperature control 5, a temperature control fluid inlet 5a, a temperature control fluid outlet 5b, a metal baffle 6, a microwave heating furnace 7, a microwave input 7a, an atmosphere cavity 8, a gas inlet 8a, a gas outlet 8b, a middle temperature control 9, a temperature control fluid inlet 9a, a temperature control fluid outlet 9b, a rear temperature control 10, a temperature control fluid inlet 10a, a temperature control fluid outlet 10b, a guide wheel 11 and a squeezing roller 12.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
Firstly, a plastic optical fiber 1 passes through a solution 2a in a soaking pool 2 through a guide wheel 11 to be coated with a graphene derivative solution, then the composite plastic optical fiber coated with a graphene derivative layer is squeezed to remove redundant solution through a squeezing roller 3, then the composite plastic optical fiber is dried through a drying room 4, then the composite plastic optical fiber enters a front temperature control area 5, the temperature of the composite plastic optical fiber before entering microwave heating is controlled by setting temperature circulating fluid through a temperature control fluid inlet 5a (such as air, water and the like with a certain temperature) and a temperature control fluid outlet 5b, and then the composite plastic optical fiber enters a microwave oven 7 protected by a metal baffle 6 with small holes. An atmosphere cavity 8 is arranged in a heating area of the microwave oven, and the atmosphere environment around the composite fiber in the microwave heating area is controlled by utilizing a gas inlet 8a and a gas outlet 8 b; meanwhile, a middle temperature control 9 is further provided in the microwave heating area to control the temperature environment around the composite fiber during microwave heating by setting a temperature circulating fluid through a temperature control fluid inlet 9a and a temperature control fluid outlet 9 b. Then, microwave is input through a microwave input 7a, the graphene derivative layer on the composite plastic optical fiber is heated temporarily through the microwave under a set atmosphere and temperature environment, then the graphene derivative layer leaves the microwave oven 7 through a metal baffle plate with small holes and enters a rear temperature control area 10, temperature circulating fluid is set through a temperature control fluid inlet 10a and a temperature control fluid outlet 10b to cool the composite plastic optical fiber after the microwave heating treatment, and then the composite plastic optical fiber is extruded through an extrusion roller 12 to obtain the composite plastic optical fiber coated by the graphene layer. The metal baffle 6 can be changed from small hole opening to facilitate the continuous operation of the plastic optical fiber to guide the plastic optical fiber to pass by the metal baffle by the guide wheel 11 to continuously operate, thereby being beneficial to blocking microwave and enhancing the protection of human body. As shown in fig. 2.
The plastic optical fiber surface is converted into a graphene layer after being coated with a graphene derivative layer, which is a challenge to be solved. Except for the long-time treatment at the extremely high temperature, the carbon content of the graphene derivative treated by the common chemical reduction and high-temperature reduction method hardly exceeds 90 percent, and the long-time treatment at the extremely high temperature not only consumes large energy, but also damages the thin-layer structure of the graphene derivative. There is therefore an urgent need to develop new techniques to convert graphene derivative layers into graphene layers. Therefore, the invention firstly utilizes the characteristic that the graphene derivative has microwave absorption characteristic and the characteristic that the microwave has rapid temperature rise internationally, and the graphene derivative layer passes through the microwave heating zone at a set speed in a set atmosphere, so that the graphene derivative layer is heated and processed under the conditions of accurately controlling the heating time and avoiding uneven heating, and the graphene derivative layer is converted into the graphene layer. In fact, there have been some related studies on the application of microwave treatment to graphene-related materials. For example, one method for preparing graphene oxide is to microwave-treat graphite oxide, and separate few layers or even single layers of graphene oxide from each other by microwave heating to a high temperature of more than two thousand degrees celsius, which causes a large amount of gas to be generated inside the graphite oxide. And the graphene oxide can be almost completely reduced at high temperature of more than two thousand degrees centigrade to be converted into graphene. Our experiments show that graphene derivatives including graphene oxide, reduced graphene oxide and graphene edge derivatives can be efficiently converted into graphene by microwave heating treatment in a non-oxidizing atmosphere. The problem is that the common microwave heating treatment has high local temperature due to centralized heating, so that severe reaction generates gas and the structure of the graphene derivative material is damaged, and the graphene derivative layer becomes fragments, so that the microwave heating process must be effectively controlled to effectively treat the graphene derivative at high temperature and avoid the damage of the severe reaction to the structure of the graphene derivative material. Our experiments show that the graphene derivatives can be effectively converted into graphene by short-time microwave heating for less than 3 seconds under a set atmosphere, but since rapid expansion of gases including moisture generated by reduction is an important pushing hand for causing structural damage of the graphene derivatives, we have generated an idea of avoiding rapid expansion, such as water vapor generated by reduction due to rapid cooling. Experiments show that the structure of the graphene derivative material can be well maintained and the graphene derivative material can be finally converted into the graphene material due to the fact that the graphene derivative material is rapidly heated by microwaves and gas generated by rapid cooling reduction under the condition of introducing cold nitrogen. Of course, heating the material while cooling with the introduction of cooled nitrogen gas is still desired from the viewpoint of energy consumption. Another problem of microwave heating treatment of graphene derivative materials is the problem of uneven heating of a microwave heating area, which is related to the uniformity of a heating electric field in a microwave oven, and although the uniformity of heating in the microwave oven can be improved by designing a curved antenna structure, the uneven heating of the electric field is difficult to avoid, and the effect of uneven heating causes the effect of converting graphene derivative materials into graphene to be different in different areas and affects the overall performance, and if the heating time is prolonged, it may happen that a part of graphene derivative materials are damaged due to overheating, and another part of graphene derivative materials may not be well reduced. Therefore, in order to reduce the increase of energy consumption caused by the cooling of the cooling fluid while microwave heating and improve the uniformity of the microwave heating treatment, a method is considered in which the graphene derivative material is heated by a microwave heating zone at a set speed under a set atmosphere to accurately control the heating time, and then is rapidly cooled, so that the graphene derivative in all the zones can be relatively uniformly heated by the whole microwave heating zone, and after the microwave heating is finished, the graphene derivative is cooled at room temperature unless the temperature is specially reduced, and then is cooled by a cooling device after leaving the microwave oven, so that the energy consumption of the cooling is reduced. Experiments show that the method has good effect, the content of carbon in the graphene layer exceeds 90% for the graphene derivative layer to be converted into the graphene layer, and the common graphite is nearly completely reduced due to the fact that 3% of oxygen is adsorbed by the common graphite, and the graphene derivative layer has good electrical property.
The present invention will be further described with reference to the following examples.
The first embodiment is as follows:
firstly, graphene oxide powder and reduced graphene oxide powder are prepared. 30 g of graphite are mixed with 15g of sodium nitrate and 750 ml of concentrated sulfuric acid. The mixture was cooled to 0 ℃ in an ice bath and stirred for 2h, then 90 g of potassium permanganate were slowly added, keeping the temperature of the mixture below 5 ℃ during mixing. The mixture was stirred for an additional hour and warmed to room temperature by removing the ice bath. To the mixture was added 1 liter of distilled water and the temperature in the oil bath was increased to 90 ℃. An additional 300 ml of water was added and stirred for another half an hour. The color of the mixture turned brown. The mixture was then treated and diluted with 30% 300 ml hydrogen peroxide and 30 l hot water. The mixture was further washed with an excess of water until the pH of the filtrate was almost neutral to obtain graphene oxide. The graphene oxide was then dispersed in water and reduced with hydrazine hydrate at 80 degrees celsius for 12 hours. Reduced graphene oxide formed as a black precipitate, collected by filtration through a 0.45 μm PTFE membrane, and rinsed with copious amounts of water. The product was further purified by soxhlet extraction with methanol, Tetrahydrofuran (THF) and water. Finally, the obtained reduced graphene oxide is freeze-dried at-120 ℃ under a vacuum environment of 0.05 mm Hg. Then, 5 mg/ml of an aqueous solution of reduced graphene oxide was prepared with deionized water.
And secondly, obtaining a polymethyl methacrylate (PMMA) plastic optical fiber with the diameter of 1 mm, coating the plastic optical fiber through a 0.5 mg/ml reduced graphene oxide aqueous solution immersion tank at the speed of 60 m/min, removing redundant solution from the composite fiber through a liquid squeezing roller with the linear pressure of 250N/cm and the hardness of 85 ℃, and drying the composite fiber in a drying room at the temperature of 150 ℃ to obtain the composite plastic optical fiber with the surface coated with the reduced graphene oxide layer. Then the composite plastic optical fiber is cooled to zero centigrade in the front temperature control area, and then enters a microwave heating area with the temperature of minus 10 ℃ in the middle temperature protection of argon protection through a stainless steel metal baffle plate with a small hole. The microwave heating zone is formed by connecting 10 1000W microwave ovens, the length of the heating zone reaches 1 meter, the composite plastic optical fiber is heated by microwaves for about 1 second, then enters a rear temperature control zone with the temperature of 0 ℃ through a small hole on a metal baffle plate for cooling, and then is extruded by an extrusion roller with the linear pressure of 500N/cm. And repeating the coating, cooling, microwave heating, cooling and extruding processes for three times to obtain the composite PMMA plastic optical fiber with the carbon content of the graphene layer being more than 90 percent and the use temperature range being increased from minus 10 to 70 to minus ten to 100 ℃.
Example two:
a Polystyrene (PS) plastic optical fiber having a diameter of 0.5 mm was first obtained, and then the plastic optical fiber was passed through a 10 mg/ml aqueous graphene oxide solution having a length of 30 cm at a speed of 0.1 m/s, and dried to obtain a polystyrene plastic optical fiber having a graphene oxide layer coated on the surface thereof. The composite plastic optical fiber is treated in hydrazine hydrate steam at 95 ℃ for 24 hours to reduce the graphene oxide layer, so that the PS plastic optical fiber coated with the reduced graphene oxide is obtained. And then heating the composite plastic optical fiber through a heating zone with the diameter of 1000W and the diameter of 10 cm of a microwave oven at the speed of 0.2 m/s under the protection of nitrogen at the temperature of-5 ℃ below zero for about 0.5 s, then cooling the composite plastic optical fiber in a region with the temperature of-5 ℃ below zero, repeating the cooling-microwave heating-cooling process for 20 times, and then extruding the composite plastic optical fiber through an extrusion roller under the linear pressure of 300N/cm to obtain the composite PS plastic optical fiber with the carbon content of the graphene layer of more than 90 percent and the use temperature range of being increased from-10 ℃ to 70 ℃ to-ten ℃ to 100 ℃.
Example three:
first, edge carboxylated graphene sheets are prepared. 5 grams of graphite and 100 grams of dry ice were added to a stainless steel capsule containing 1000 grams of stainless steel balls 5 mm in diameter. The vessel was sealed and fixed in a planetary ball mill (F-P4000) and stirred at 500rpm for 48 hours. Subsequently, the internal pressure is slowly released through a gas outlet. After the ball milling is finished, the container cover is opened in the air, and the carboxylate is initiated to generate violent hydration reaction by the moisture in the air to generate carboxylic acid so as to flash. The product obtained is subjected to soxhlet extraction with a 1M hydrochloric acid solution to completely acidify the carboxylate and remove possible metallic impurities. And finally, freeze-drying the graphene nano sheet at-120 ℃ for 48 hours under a vacuum environment of 0.05 mm Hg to obtain dark black powder of the edge carboxylated graphene nano sheet. 0.1 wt% of edge-carboxylated graphene nanoplatelets was sonicated in isopropanol for 30 minutes to obtain a uniformly dispersed solution.
And secondly, obtaining a Polycarbonate (PC) plastic optical fiber with the diameter of about 0.8 mm, operating the PC plastic optical fiber at the speed of 0.1 m/s, spraying 0.1 wt% of isopropanol solution of edge carboxylated graphene nanosheets to the upper part through a spray head, repeatedly operating the PC plastic optical fiber for 100m intervals, spraying the PC plastic optical fiber through another spray head, spraying for 5 times, and carrying out vacuum drying at 50 ℃ for 24 hours to obtain the composite PC plastic optical fiber wrapped by the edge carboxylated graphene layer. The composite PC plastic optical fiber passes through a temperature control area of minus 10 ℃ at a speed of 0.1 m/s under the protection of helium so that the fiber is at minus 10 ℃, then is heated for about 1 second through a heating area of a microwave oven with the power of 1000W and the diameter of 10 cm, then enters the area of minus 10 ℃ again for cooling, the cooling-microwave heating-cooling process is repeated for 2 times, and then the composite PC plastic optical fiber is extruded through an extrusion roller with the linear pressure of 400N/cm to obtain the composite PC plastic optical fiber with the carbon content of a graphene layer of more than 90 percent and the highest use temperature of 150 ℃ increased from 135 ℃.
Example four:
firstly, preparing an edge halogenated graphene nanosheet. 5 grams of graphite was added to a stainless steel capsule containing 1000 grams of stainless steel balls of 5 mm diameter. The capsules were then sealed and filled and evacuated with argon for five cycles under vacuum pressure of 0.05 mm hg. Thereafter, chlorine gas was added from the gas inlet through the cylinder pressure of 8.75 atm. The vessel was sealed and fixed in a planetary ball mill (F-P4000) and stirred at 500rpm for 48 hours. The obtained product is subjected to Soxhlet extraction by using methanol and 1M hydrochloric acid solution in sequence to thoroughly remove small molecular organic impurities and possible metal impurities. And finally, freeze-drying the graphene nano sheets for 48 hours at-120 ℃ under a vacuum environment of 0.05 mm Hg to obtain dark black powder of the edge chlorinated graphene nano sheets. Then 0.01 mg/ml of edge chlorinated graphene isopropanol solution was prepared.
The core with the diameter of 1 mm is obtained as the fluorinated gradient plastic optical fiber. Then the plastic optical fiber is operated at the speed of 1 dm/s, the plastic optical fiber is allowed to be 6 cm away from the electrostatic atomizer nozzle, 8KV voltage is applied on the electrostatic atomizer nozzle, 0.01 mg/ml of edge chlorinated graphene isopropanol solution is sprayed on the plastic optical fiber through the nozzle at the speed of 200 microliter/min, and then the plastic optical fiber is dried at room temperature, and the electrostatic spraying and the room temperature drying are repeated for 10 times, so that the composite plastic optical fiber coated by the edge chlorinated graphene is obtained. The composite plastic optical fiber was vacuum dried at 50 degrees celsius for 10 hours. And then under the protection of nitrogen, heating the composite plastic optical fiber at the speed of 0.05 m/s in a temperature environment of-3 ℃ for about 2 seconds by a heating zone with the diameter of 10 cm of a microwave oven with the power of 1000W, then cooling the composite plastic optical fiber in a region of-3 ℃ again, repeating the cooling-microwave heating-cooling process for 5 times, and then extruding the composite optical fiber by an extrusion roller with the linear pressure of 250N/cm to obtain the composite plastic optical fiber with the carbon content of the graphene layer of more than 90 percent and the highest service temperature of 100 ℃ from 70 ℃.
Claims (8)
1. A preparation method of an enhanced plastic optical fiber is characterized in that the surface of the plastic optical fiber is coated with a graphene layer; the carbon content in the graphene layer is more than 90%; the plastic optical fiber surface is coated with the graphene layer by the following method: firstly, preparing a graphene derivative solution, then coating the graphene derivative solution on the surface of a selected plastic optical fiber to form a composite plastic optical fiber, then enabling the composite plastic optical fiber to move through a microwave heating zone at a set speed under a set atmosphere, enabling the graphene derivative on the surface of the composite plastic optical fiber to be subjected to microwave heating treatment, enabling the composite plastic optical fiber to leave the microwave heating zone and be cooled, and then performing extrusion treatment to obtain the composite plastic optical fiber with the surface coated with a graphene layer.
2. The method of claim 1, wherein the graphene derivative is an oxide of graphene, and comprises graphene oxide, reduced graphene oxide, and graphene edge derivatives.
3. The method of claim 1, wherein the microwave heating process is performed by absorbing microwave to raise temperature of graphene derivative and reduce oxidized graphene, and removing edge functional groups from graphene edge derivative.
4. The method of claim 1, wherein the microwave heating treatment is performed for less than 30 seconds.
5. The method according to claim 1, wherein the predetermined atmosphere is an inert atmosphere, a reducing atmosphere or a vacuum state; the inert atmosphere refers to a gas in which the gas does not react with the graphene derivative; the reducing atmosphere is a gas containing a reduced graphene derivative in a gas; the vacuum state refers to the air pressure of less than 4 KPa.
6. A method of manufacturing a reinforced plastic optical fiber according to claim 1, wherein said plastic optical fiber is left from the microwave heating zone and cooled by a cold atmosphere or additional application of a cold fluid.
7. The method of claim 1, wherein the microwave heating and subsequent cooling of the plastic optical fiber after leaving the microwave heating zone is repeated a plurality of times.
8. The method according to claim 1, wherein the graphene derivative solution is coated on the surface of the selected plastic optical fiber to form a composite plastic optical fiber, the composite plastic optical fiber is moved through the microwave heating zone at a set speed under a set atmosphere to be heated by microwaves, the composite plastic optical fiber leaves the microwave heating zone to be rapidly cooled, and the extrusion process is repeated to coat the graphene derivative on the surface of the selected plastic optical fiber for multiple times to obtain the thickened graphene layer.
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