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g-c3n4-doped polyimide composite material, and preparation and application thereof

A technology of polyimide and composite materials, applied in the field of anti-radiation applications, polyimide composite materials, and preparation, can solve the problems of poor mechanical properties, containing toxic heavy metal ions, unsatisfactory heat resistance, etc. The effect of heavy metals

Inactive Publication Date: 2015-09-16
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Technical problem: The purpose of the present invention is to overcome the shortcomings of traditional neutron radiation shielding materials such as poor mechanical properties, unsatisfactory heat resistance, containing toxic heavy metal ions, and using expensive B or rare earth element compounds, etc., to provide a good heat resistance, Toxic metal-free and affordable g-C 3 N 4 Doped polyimide composite material, also providing a preparation method of the material and its application in neutron radiation shielding

Method used

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  • g-c3n4-doped polyimide composite material, and preparation and application thereof
  • g-c3n4-doped polyimide composite material, and preparation and application thereof
  • g-c3n4-doped polyimide composite material, and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1: g-C 3 N 4 Preparation of:

[0051] Weigh 3g of cyanamide into the crucible, raise it from the greenhouse to 500, 520, 530, and 550°C in the muffle furnace at a rate of 2.3°C / min for 4 hours, keep the temperature at the set temperature for 4 hours, and then cool down naturally . After cooling to room temperature, take it out, grind the sample into powder, put it into a glass bottle, seal it up for measurement and weigh it.

Embodiment 2

[0052] Example 2: g-C 3 N 4 The preparation of a polyimide composite film with a content of 5% and a size of 5 × 5 × 1 cm is as follows:

[0053] (1) Recrystallize an appropriate amount of benzoic dianhydride and 4,4'-diamine diphenyl ether with acetic anhydride and ethanol respectively. And a certain amount of polar solvent N-methylpyrrolidone (NMP) was distilled under reduced pressure.

[0054] (2) Add 15.11g (0.1500mol) of diamine to a 250ml three-necked flask equipped with mechanical stirring, and add 150ml of distilled solvent NMP. After mechanical stirring until the diamine is dissolved, add 1.6647g of g-C 3 N 4 After uniform dispersion, slowly add 16.52 g (0.1530 mol) of dianhydride in batches. The reaction was stirred at room temperature for 5 hours to obtain a viscous polyamic acid solution PAA.

[0055] (3) After the reaction is complete and the viscosity rises, pour the PAA solution into a glass plate with a size of 5×5×1 cm, put it into a vacuum drying oven f...

Embodiment 3

[0056] Example 3: g-C 3 N 4 The preparation of a polyimide composite film with a content of 10% and a size of 5 × 5 × 1 cm is as follows:

[0057] (1) Recrystallize an appropriate amount of benzoic dianhydride and 4,4'-diamine diphenyl ether with acetic anhydride and ethanol respectively. And a certain amount of polar solvent N-methylpyrrolidone (NMP) was distilled under reduced pressure.

[0058] (2) Add 15.11g (0.1500mol) of diamine to a 250ml three-necked flask equipped with mechanical stirring, and add 150ml of distilled solvent NMP. After mechanical stirring until the diamine is dissolved, add 3.3295g of g-C 3 N 4 After uniform dispersion, slowly add 16.52 g (0.1530 mol) of dianhydride in batches. The reaction was stirred at room temperature for 5 hours to obtain a viscous polyamic acid solution PAA.

[0059] (3) After the reaction is complete and the viscosity rises, pour the PAA solution into a glass plate with a size of 5×5×1 cm, put it into a vacuum drying oven ...

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Abstract

The invention discloses a g-C3N4-doped polyimide composite material which is prepared by the following steps: polymerizing a diamine monomer ODA (diaminodiphenyl ether) and another dianhydride monomer PMDA (pyromellitic dianhydride) or BPDA (3,3',4,4'-biphenyl dianhydride) to form polyamic acid, wherein graphite carbon nitride (g-C3N4) is added before the polyamic acid solution formation process; and after the system is imidized, carrying out hot pressing to form the g-C3N4-doped polyimide composite material. The g-C3N4 is doped into the polyimide system under the physical action. The g-C3N4-containing polyimide film material obtained by the method has favorable thermal neutron shielding property. The invention also discloses a preparation method of the g-C3N4-doped polyimide material and application of the g-C3N4-doped polyimide material in neutron radiation shielding.

Description

technical field [0001] The present invention relates to a kind of containing g-C 3 N 4 Polyimide composite materials, especially a kind containing g-C 3 N 4 The polyimide composite material, preparation method and its anti-radiation use. Background technique [0002] Neutrons have no charge and do not interact with electrons outside the nucleus, only with the nucleus. According to the energy, it can be divided into slow neutrons (energy 0.5 ~ 1.0keV), medium energy neutrons (energy 1.0keV ~ 0.5MeV) and fast neutrons (energy greater than 0.5MeV). The mass of neutron is very close to that of proton, so paraffin, polyethylene, polypropylene and boron with higher hydrogen content are excellent neutron shielding materials. [0003] In recent years, the harmful effects of various radiation, especially neutron radiation, on the human body and environmental organisms have gradually been recognized by people, so a lot of development and research have been carried out on neutron ...

Claims

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Application Information

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IPC IPC(8): C08G73/10C08K5/3492C08J5/18C08L79/08
Inventor 杨洪宗德超郭玲香林保平
Owner SOUTHEAST UNIV
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