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Polyethylene glycol grafted graphene oxide composite solid-solid phase change material and preparation method thereof

A technology of polyethylene glycol grafting and graphene compounding, applied in chemical instruments and methods, heat exchange materials, etc., can solve the problems of low latent heat of phase change, poor high thermal performance, etc., and achieve improved heat transfer performance and thermal conductivity Excellent, compatibility-enhancing effect

Inactive Publication Date: 2018-08-17
GUILIN UNIV OF ELECTRONIC TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the technical problems of low latent heat of phase change and poor high thermal performance in existing SSPCMs, the present invention provides a PEG-grafted graphene oxide composite solid-solid phase change material and its preparation method

Method used

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  • Polyethylene glycol grafted graphene oxide composite solid-solid phase change material and preparation method thereof

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Embodiment

[0025] Step 1) Use a cross-linking agent to carry out terminal functional modification of polyethylene glycol,

[0026] Weigh 10 g of polyethylene glycol with a weight-average molecular weight of 8000 and place it in a three-necked flask, add 50 mL of N,N-dimethylformamide (DMF) solution, heat to 85 °C, and magnetically stir until it is completely dissolved to obtain poly Ethylene glycol-DMF solution. Weigh 4,4'-diphenylmethane diisocyanate (MDI) with a ratio of 2:1 to polyethylene glycol, and dissolve it in 20 mL N,N-dimethylformamide (DMF) solution to obtain Crosslinker-DMF solution. The cross-linking agent-DMF solution was slowly added to the polyethylene glycol-DMF solution under magnetic stirring, and reacted at 85 ° C for 5 hours under an argon atmosphere to obtain a prepolymer;

[0027] Step 2) Add graphene oxide self-assembly and graft polymerization polyethylene glycol,

[0028] Weigh 0.9g of graphene oxide and add 100 mL of N,N-dimethylformamide (DMF) solution, pl...

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Abstract

The invention discloses a polyethylene glycol grafted graphene oxide composite solid-solid phase change material. The main components comprise polyethylene glycol, a crosslinking agent and graphene oxide; the polyethylene glycol is subjected to tail end functionalized modification by the crosslinking agent; the polyethylene glycol and the graphene oxide form a mutually linked skeleton through electrostatic interaction between a hydrogen bond and a functional group; and the polyethylene glycol grafted graphene oxide composite solid-solid phase change material has a graphene layered structure. The preparation method comprises the following steps: 1) performing molecular chain tail end functionalized modification on the polyethylene glycol by the crosslinking agent; and 2) adding the grapheneoxide to perform self assembling and graft polymerization on the polyethylene glycol. Self assembling of the graphene oxide and graft polymerization of the polyethylene glycol are realized through molecular chain tail end functionalization, a composite phase change material with a graphene layered structure is formed, and the advantages of maintaining solid state in the phase change process, obviously improving phase change latent heat and having more excellent heat conductivity are achieved. Therefore, the polyethylene glycol grafted graphene oxide composite solid-solid phase change materialhas a wide application prospect in the field of phase change thermal storage.

Description

technical field [0001] The invention relates to the field of phase change energy storage materials, in particular to a polyethylene glycol grafted graphene oxide composite solid-solid phase change material and a preparation method thereof. Background technique [0002] With the development of the economy and the progress of society, the depletion of traditional fossil energy is increasing, and many environmental problems caused by the use of traditional energy are becoming more and more serious. Therefore, the development of energy storage technology with high performance, low cost and environmental protection is becoming more and more important. Thermal energy storage systems offer possibilities for energy storage, and latent heat storage is the most efficient way to store thermal energy. Phase-change energy storage material (PCM) is a material that utilizes the heat-absorbing and exothermic properties of substances during the phase change process to store heat and regulat...

Claims

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Application Information

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IPC IPC(8): C09K5/02C08G18/48C08K3/04
CPCC08G18/4833C08K3/042C09K5/02
Inventor 张焕芝夏永鹏黄悦刘育荣孙立贤徐芬
Owner GUILIN UNIV OF ELECTRONIC TECH
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