Molybdenum disulfide nanosheet/polyimide based composite aerogel and preparation method thereof

A polyimide-based, composite aerogel technology, applied in the field of aerogels, can solve the problems of easy stacking and difficult dispersion, and achieve easy operation, simple preparation process, excellent thermal stability and flame retardant performance. Effect

Inactive Publication Date: 2016-06-01
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the molybdenum disulfide bulk material is easy to stack due to the strong interaction between the layers, and it is difficult to disperse

Method used

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  • Molybdenum disulfide nanosheet/polyimide based composite aerogel and preparation method thereof
  • Molybdenum disulfide nanosheet/polyimide based composite aerogel and preparation method thereof
  • Molybdenum disulfide nanosheet/polyimide based composite aerogel and preparation method thereof

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Experimental program
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Embodiment 1

[0036] Embodiment 1, the present embodiment comprises the following steps:

[0037] (1) Preparation of molybdenum disulfide nanosheets with good water dispersibility. Dissolve 1mmol ammonium molybdate tetrahydrate and 14mmol thiourea in 30mL deionized water, then transfer this solution to a 40mL hydrothermal kettle, and react at 200°C for 12h. After the reaction, the sample was repeatedly washed 3-5 times with deionized water and dried. Then the dried molybdenum disulfide nanosheets were dispersed in deionized water at a concentration of 8mgmL -1 .

[0038] (2) The steps for preparing water-soluble polyamic acid are the same as our patent CN104355302A.

[0039] (3) Take 2.5mL of the prepared 8mgmL -1 Molybdenum disulfide nanosheet aqueous dispersion, add 8.5mL deionized water and 0.5g triethylamine, ultrasonic 0.5h. Put 1 g of water-soluble polyamic acid fiber into the aqueous dispersion of molybdenum disulfide nanosheets containing triethylamine, stir to dissolve, and th...

Embodiment 2

[0041] Embodiment 2, this embodiment comprises the following steps:

[0042] Change the ratio of molybdenum disulfide nanosheets and polyamic acid to 5:100, that is, take 6.25mL of prepared 8mgmL -1 Molybdenum disulfide nanosheet aqueous dispersion, add 4.75mL deionized water and 0.5g triethylamine, ultrasonic 0.5h. denoted as MoS 2 / PI-5.

Embodiment 3

[0043] Embodiment 3, this embodiment comprises the following steps:

[0044] Change the ratio of molybdenum disulfide nanosheets and polyamic acid to 8:100, that is, take 10mL of prepared 8mgmL -1 Add 1mL of deionized water and 0.5g of triethylamine to the aqueous dispersion of molybdenum disulfide nanosheets, and ultrasonicate for 0.5h, and the rest are the same as in implementation 1. for MoS 2 / PI-8.

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Abstract

The invention belongs to the technical field of aerogel and particularly relates to molybdenum disulfide nanosheet / polyimide based composite aerogel and a preparation method thereof. The composite aerogel is prepared by compounding molybdenum disulfide nanosheets with good water dispersibility, prepared by a solvothermal method, with polyimide, and from molybdenum salt, sulfosalt and one or more of water-soluble polyimide precursor, and polyamide acid. The preparation process comprises the steps of preparing molybdenum disulfide nanosheets with good water dispersibility by the one-step solvothermal method, compounding the molybdenum disulfide nanosheets with polyamide acid, and performing sol-gel preparation, freezing-drying and amidation to obtain the molybdenum disulfide nanosheet / polyimide based composite aerogel. The composite aerogel has the characteristics that internal pores are uniformly distributed and the limit oxygen index is obviously higher than relative performance of macromolecule based aerogel in other documents or patents, and thus the composite aerogel can be taken as an ideal flame retardant material, heat insulation material and noise reduced material.

Description

technical field [0001] The invention belongs to the technical field of airgel, and in particular relates to a polymer-based composite airgel and a preparation method thereof. Background technique [0002] Polymer airgel is a porous and lightweight material with a three-dimensional network structure. It has low cost, easy molding, high porosity (80-99.8%) and large specific surface area (200-1000m 2 g -1 )Etc. Its unique porous structure makes polymer aerogels have broad application prospects in heat insulation, flame retardancy, and sound insulation. At present, polymer airgel is usually based on polyvinyl alcohol and phenolic polymer materials, nanoclays (such as montmorillonite, kaolin and halloysite), carbon nanomaterials and SiO 2 etc. are fillers, prepared by sol-gel process and special drying technology (such as freeze drying technology, supercritical drying technology). However, these polymer-based aerogels generally have poor mechanical properties (compression mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00
CPCB01J13/0091
Inventor 刘天西张由芳樊玮左立增鄢家杰鲁恒毅顾华昊
Owner FUDAN UNIV
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