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Polyimide grafted polyethylene glycol composite solid-solid phase change material and preparation method thereof

A technology of grafting polyethylene glycol and polyimide, which is applied in the field of polyimide grafted polyethylene glycol composite solid-solid phase change materials and its preparation, can solve the problem of toxic and harmful substances and high cost of crosslinking agents , Increase production costs and other issues, achieve good dispersion, reduce latent heat of phase change, and reduce the possibility of leakage

Active Publication Date: 2019-12-31
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention still has the following problems: the preparation process needs to be carried out under a protective gas; the reaction time is as long as 22-42 h; after the reaction is completed, vacuum distillation is required; the drying time is as long as 5-10 days
Greatly increased production costs
At the same time, the invention uses isocyanate cross-linking agents, which are usually toxic and harmful substances, and certain protective measures need to be taken during the experiment to avoid harm to experimenters and the cost of such cross-linking agents is relatively high

Method used

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  • Polyimide grafted polyethylene glycol composite solid-solid phase change material and preparation method thereof
  • Polyimide grafted polyethylene glycol composite solid-solid phase change material and preparation method thereof
  • Polyimide grafted polyethylene glycol composite solid-solid phase change material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0056] A preparation method of polyimide grafted polyethylene glycol composite solid-solid phase change material:

[0057] Step 1) Preparation of the mixed solution of graphene oxide modified polyimide precursor, pyromellitic dianhydride and 4,4-diaminodiphenyl ether according to the ratio of the amount of substance is 1:1, firstly mix 5.71 Add g of 4,4-diaminodiphenyl ether into a 250 mL three-necked flask, add 100 mL of N,N-dimethylformamide, and then Add 0.2 g of graphene oxide at a ratio of 1:0.035, ultrasonically disperse for 30 min, then transfer to an ice bath and mechanically stir for 30 min, and then divide 6.22 g of pyromellitic dianhydride at the same interval for 30 min. Three times were added into the three-necked flask, and the stirring was continued for 6 h to obtain a mixed solution of graphene oxide modified polyimide precursor.

[0058] Step 2) Preparation of polyimide-based graphene oxide grafted polyethylene glycol composite solid-solid phase change materi...

Embodiment 2

[0068] A preparation method of a polyimide-based graphene oxide grafted polyethylene glycol composite solid-solid phase change material: the steps not specified in the specific steps are the same as the preparation method of the above-mentioned Example 1, the difference is that: The mass ratio of the mixed solution of the graphene oxide modified polyimide precursor and the molten polyethylene glycol is 1:1.

Embodiment 3

[0070] A preparation method of a polyimide-based graphene oxide grafted polyethylene glycol composite solid-solid phase change material: the steps not specified in the specific steps are the same as the preparation method of the above-mentioned Example 1, the difference is that: The mass ratio of the mixed solution of the graphene oxide modified polyimide precursor and the molten polyethylene glycol is 1:1.5.

[0071] In order to study the influence of the mass ratio of the mixed solution of the graphene oxide modified polyimide precursor and the melted polyethylene glycol on the performance of the composite phase change material, the material obtained in the above-mentioned Examples 2 and 3 was tested by DSC.

[0072] The mixed solution of graphene oxide modified polyimide precursor and the test result when the polyethylene glycol mass ratio of melting is 1:1 are as follows Figure 8 As shown, the melting temperature is 58.31 ℃, the crystallization temperature is 40.33 ℃, and...

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Abstract

The invention discloses a polyimide grafted polyethylene glycol composite solid-solid phase change material. The material mainly comprises polyethylene glycol, polyimide and graphene oxide, wherein amutual cross-linked network structure is formed through the interaction of functional groups and hydrogen bonds among polyethylene glycol, a polyimide precursor and graphene oxide molecules, and thena stable mutual cross-linked skeleton structure is formed through further thermal cross-linking of the polyimide precursor under the inert atmosphere high-temperature condition. The material disclosedby the invention is a stratified structure with cross-linked pores. The preparation method comprises the following steps of 1) preparing a mixed solution of a graphene oxide modified polyimide precursor; 2) and (3) preparing the stratified cross-linked porous structure composite solid-solid phase change material.

Description

technical field [0001] The invention relates to the field of phase-change energy storage materials, in particular to a polyimide-grafted polyethylene glycol composite solid-solid phase-change material and a preparation method thereof. Background technique [0002] With the increasing global energy consumption and the increasing environmental pollution, the development and utilization of new energy has attracted more and more attention. Research and promotion of efficient and environmentally friendly energy storage devices has become an indispensable link in the development of new energy. Phase-change energy storage materials and devices, as an efficient way of thermal energy storage, are becoming more and more popular because of their high energy storage density, good chemical stability, non-toxicity, mature research technology, simple device and easy management. increasingly arousing people's attention. With the development of phase change energy storage technology, it has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08J3/24C08K3/04C09K5/14C08L87/00
CPCC08G81/00C08J3/24C08J2387/00C09K5/14C08K3/042
Inventor 张焕芝张青峰朱钰漕黄朝玮季蓉黄凤园夏永鹏魏胜孙立贤徐芬
Owner GUILIN UNIV OF ELECTRONIC TECH
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