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Polyimide-based composite film with optical limiting performance

A polyimide-based, composite film technology, applied in the field of laser protection, can solve the problems of difficult liquid phase materials and lack of practical value, and achieve the effect of good light transmission

Inactive Publication Date: 2015-03-25
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, most of the current research work on the optical limiting performance of optical limiting materials is carried out in the liquid phase matrix. Although it has important theoretical significance for revealing the optical limiting mechanism, the liquid phase material is not practical because it is difficult to device. value

Method used

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  • Polyimide-based composite film with optical limiting performance
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  • Polyimide-based composite film with optical limiting performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of graphene oxide nanosheets / polyimide composite films. Specific steps are as follows:

[0027] (1) Preparation of graphene oxide nanosheets

[0028] Using improved Hummers method, using graphite as raw material, concentrated H 2 SO 4 as solvent, KMnO 4 Fabrication of graphene oxide nanosheets (GONSs) for oxidants. The basic process is: 11.5 mL concentrated H 2 SO 4 Mix with 0.5 g graphite and stir well, then slowly add 1.5 g KMnO 4 , continued to react for 4 h, and the solution was purple-green. After the reaction was completed, 22 mL of deionized water was slowly added dropwise to the mixture (keep the temperature below 100 °C). Add 5% hydrogen peroxide dropwise until the color of the mixture turns golden yellow. The reacted solution was filtered and washed with 5% HCL solution and washed repeatedly with deionized water until the filtrate was neutral (pH≈7) and free of SO 4 2- . The obtained solid was redispersed in ultrapure water, and after u...

Embodiment 2

[0038] Preparation of graphene oxide nanoribbons / polyimide composite films. Specific steps are as follows:

[0039] (1) Preparation of graphene oxide nanoribbons

[0040] In 36 mL of concentrated H 2 SO 4 Add 0.15 g MWCNTs to the solution, stir magnetically for 1-2 h, then add 4 mL H 3 PO 4 , and continue stirring for 15 min. Add 0.75 g KMnO 4 Then, it was transferred to an oil bath at 65 °C and stirred for 2 h. After the reaction was completed and cooled to room temperature, 100 mL of ice water (containing 5 mL of 30% H 2 o 2 ), let stand for 14 h.

[0041]After standing still, pour off the supernatant, filter the remaining solution with a 220 μm microporous membrane, and wash twice with 6 mL of 20% HCl. The solid obtained by suction filtration was redispersed in 60 mL of ultrapure water, stirred for 2 h, and then ultrasonicated to obtain a uniformly dispersed solution, which was added to 40 mL of 30% HCl and allowed to stand for 14 h.

[0042] Suction filter with ...

Embodiment 3

[0052] The preparation of graphene quantum dot / polyimide composite film, concrete steps are as follows:

[0053] (1) Preparation of graphene quantum dots

[0054] Reduction treatment of GONSs: put GONSs into a square crucible and put them in a vacuum tube furnace, and pass N 2 , control the heating rate to 5 ℃ min -1 , heated to 300°C in N 2 The reduced graphene (GNSs) was obtained by incubating in the atmosphere for 2 h.

[0055] Sonication: Dissolve 0.05 g GNSs with 10 mL concentrated H 2 SO 4 and 30 mL concentrated HNO 3 Mix and sonicate for 15-20 h.

[0056] Hydrothermal reaction: Add 250 mL of ultrapure water to the above mixture for dilution, filter with suction through a 220 μm microporous membrane, and dry the obtained solid. Weighed 0.2 g of the obtained solid and mixed it with 40 mL of deionized water, then ultrasonicated until uniformly dispersed, and adjusted its pH to 8 with NaOH. The resulting mixture was placed in a 50 mL polytetrafluoroethylene hydrothe...

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Abstract

The invention discloses a polyimide-based composite film with optical limiting performance and a preparation method and application of the polyimide-based composite film with optical limiting performance. According to the method, condensation polymerization is conducted on diamidogen and dianhydride to synthesize polyamic acid, then optical limiting material is introduced, and the polyimide-based composite film is obtained through heat amidation processing; the optical limiting material comprises organic dyestuff, carbon black, a carbon nano tube, two-dimensional graphene oxide nano-sheet, two-dimensional reduction graphene nano-sheet, a one-dimensional graphene oxide nanobelt, a one-dimensional reduction graphene nanobelt and a zero-dimensional graphene quantum dot. The prepared composite film has good transmission of light, mechanical property and heat stability, meanwhile has the optical limiting performance prior to that of single optical limiting material, and is hopeful to be applied in the field of laser protection.

Description

technical field [0001] The invention belongs to the field of laser protection, and in particular relates to a polyimide-based composite film with optical limiting performance, a preparation method and application thereof. Background technique [0002] Since its inception in 1960, lasers have been widely used in medicine, measurement, chemistry, military, material preparation and processing and other fields. However, the emergence of a large number of high-power, short-pulse, and variable-frequency lasers makes the existing fixed-wavelength laser protectors helpless. The damage or destruction of lasers to human eyes and optical sensor devices has become a social and military problem that cannot be ignored. It has become a research hotspot in the field of laser protection to design and prepare optical limiting materials based on the principle of nonlinear optics, which can exhibit large nonlinear optical effects in a wide spectral range, and ultrafast response times in nanosec...

Claims

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Application Information

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IPC IPC(8): C08L79/08C08K7/00C08K3/04C08K5/00C08J5/18C08G73/10
CPCC08K7/00C08G73/1067C08J5/18C08J2379/08C08K3/04C08K2201/011C08L79/08
Inventor 詹红兵甘垚冯苗
Owner FUZHOU UNIV
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