Method for preparing polyimide by utilizing ionic liquid and application of polyimide prepared by method

A technology of ionic liquid and polyimide, which is applied in the application field of preparing polyimide by using ionic liquid and the prepared polyimide, can solve the problems of unenvironmental protection and few types in the preparation process, and achieve the preparation process Environmentally friendly, easy to operate, few steps

Active Publication Date: 2014-05-28
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, metal-free organic semiconductor photocatalytic materials have broad development prospects, but at present, there are few types of materials, and the preparation process is not environmentally friendly.

Method used

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  • Method for preparing polyimide by utilizing ionic liquid and application of polyimide prepared by method
  • Method for preparing polyimide by utilizing ionic liquid and application of polyimide prepared by method
  • Method for preparing polyimide by utilizing ionic liquid and application of polyimide prepared by method

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Experimental program
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Effect test

Embodiment 1

[0040] Add 1.26g (0.01mol) of melamine into a 50mL round bottom flask, then add 11.30g of 1-butyl-3-methyl-imidazolium tetrafluoroborate (0.05mol), stir and mix the two, and heat to a constant temperature of 80°C 30 minutes. After the melamine is completely evenly distributed, add 2.18g (0.01mol) white powder of pyromellitic anhydride to the reaction flask, heat to 150°C, react at constant temperature for 8 hours, and cool to room temperature to obtain a light yellow thick substance. The system was washed with distilled water and ethanol respectively, filtered and dried with suction to obtain a polyimide photocatalytic material. The XRD patterns of polyimide photocatalytic materials are as follows: figure 1 shown. In the XRD pattern of PI, there appeared several new peaks that did not exist in the monomer, such as the peak at 2θ=14.26° and the strong peak at 2θ=27.48°. Among them, the strong peak at 2θ=27.48° corresponds to the interlayer spacing of 0.324nm between two-dime...

Embodiment 2

[0042]Add 1.26g (0.01mol) of melamine into a 50mL round bottom flask, then add 11.30g of 1-butyl-3-methyl-imidazolium tetrafluoroborate (0.05mol), stir and mix the two, and heat to a constant temperature of 80°C 30 minutes. After the melamine is completely evenly distributed, add 2.18g (0.01mol) white powder of pyromellitic anhydride to the reaction flask, heat to 200°C, react at constant temperature for 8 hours, and cool to room temperature to obtain a light yellow thick substance. The system was washed with distilled water and ethanol respectively, filtered and dried with suction to obtain a polyimide photocatalytic material. The XRD patterns of polyimide photocatalytic materials are as follows: figure 2 shown. The XRD patterns of PI showed strong peaks at 2θ=18.26° and 2θ=27.08°. Among them, the strong peak at 2θ=27.48° corresponds to the interlayer spacing between two-dimensional structures of 0.329nm, which is closer to the graphene interlayer spacing of 0.330nm, indi...

Embodiment 3

[0044] Add 1.26g (0.01mol) of melamine into a 50mL round bottom flask, then add 11.30g of 1-butyl-3-methyl-imidazolium tetrafluoroborate (0.05mol), stir and mix the two, and heat to a constant temperature of 80°C 30 minutes. After the melamine is completely evenly distributed, add 2.18g (0.01mol) white powder of pyromellitic anhydride to the reaction flask, heat to 230°C, react at constant temperature for 8 hours, and cool to room temperature to obtain a light yellow thick substance. The system was washed with distilled water and ethanol respectively, filtered and dried with suction to obtain a polyimide photocatalytic material. The XRD patterns of polyimide photocatalytic materials are as follows: image 3 As shown, the SEM and TEM of polyimide photocatalytic materials are as Figure 4 and Figure 5 As shown, it can be seen from the microstructure that the material has a branched structure after polymerization and a hole structure that is conducive to catalysis.

[0045] ...

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Abstract

The invention discloses a method for preparing polyimide (PI) by utilizing ionic liquid. According to the method, the PI is obtained by performing polymerization on two organic monomers in an ionic liquid solution at the polymerization temperature of 100 DEG C to 300 DEG C, wherein in the two monomers, the first monomer is aromatic amine or heterocyclic amine containing three amino function groups and the second monomer is aromatic anhydride or heterocyclic anhydride containing an anhydride functional group; the molar ratio of the first monomer to the second monomer is (0.2-5):1; the ionic liquid is imidazole tetrafluoroborate or tetrabutyl phosphorus imidazolium salt; the proportion relationship between the ionic liquid and the sum of the monomers is that the molar ratio of the ionic liquid to the monomers is (1.6-5):1. By the method, an organic photocatalytic material with a visible light absorption property is obtained through thermal polymerization of simple specific monomers, water can be decomposed by solar light to produce hydrogen, and a wide application prospect is achieved.

Description

technical field [0001] The invention relates to the preparation and application of a photocatalytic material. Background technique [0002] At present, mankind is facing a serious energy crisis and environmental pollution caused by the excessive use of fossil energy. Solar energy is the most widely sourced and cleanest renewable energy source. Therefore, the development of new photocatalytic materials with visible light activity to directly use solar energy to purify the environment or decompose water to produce hydrogen has become a hot spot for scientists around the world. [0003] Among the many semiconductor photocatalysts that have been studied in the past few decades, TiO 2 Due to its stable properties, it is a widely concerned photocatalyst. However, this material also has problems such as high preparation cost, only ultraviolet light absorption activity, and no visible light absorption, which greatly limits its practical application. Organic semiconductor photocat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C02F1/30B01J31/06C01B3/04
CPCY02E60/36Y02W10/37
Inventor 王英杨宇王翠翠周迎晟邹志刚
Owner NANJING UNIV
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