Preparation method of phase change monomer with double-bond end groups

A terminal group and phase change technology, applied in chemical instruments and methods, heat exchange materials, etc., to achieve the effects of wide application range, good high temperature resistance, and simple preparation process

Inactive Publication Date: 2011-06-15
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Luan Shifang, Xu Shilin, Wang Fang, etc. have all done research in this area, but the research on acrylic polyethylene glycol is mostly limited to the research of small molecular weight polyethylene glycol (below 1000), and it is mostly used as hydrogel, crosslinking agent, etc. , there is no report of using it as a phase change material

Method used

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  • Preparation method of phase change monomer with double-bond end groups
  • Preparation method of phase change monomer with double-bond end groups
  • Preparation method of phase change monomer with double-bond end groups

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In an ice-water bath, dissolve 10 g of polyethylene glycol with a molecular weight of 4000 in 20 ml of dichloromethane, add 0.3 g of triethylamine, and slowly add 0.2 g of acryloyl chloride dropwise; React for 8 hours; put the reaction solution in an ice-water bath, add 150ml of ether, let it stand for 10-15 minutes, and filter under reduced pressure to obtain the phase-change monomer polyethylene glycol acrylate with double bond end groups.

[0034] Carry out infrared spectrum research to above-mentioned phase change monomer (see figure 1 ) analysis, the phase-change monomer prepared by the invention strengthens the characteristic absorption peak of C-O at 1105cm-1, and the absorption peaks of C=O group and C=C double bond appear at 1720cm-1 and 1650cm-1 respectively, indicating that PEG and The acid chloride reacts to form polyethylene glycol acrylate.

[0035] By changing the crystalline form of the phase change monomer (see figure 2 ) observed that polyethylene g...

Embodiment 2

[0040] In an ice-water bath, dissolve 10 g of polyethylene glycol with a molecular weight of 4000 in 30 ml of dichloromethane, add 0.8 g of triethylamine, and slowly add 0.7 g of acryloyl chloride; React for 4 hours; put the reaction solution in an ice-water bath, add 150ml of ether, let it stand for 10-15 minutes, and filter under reduced pressure to obtain the phase-change monomer polyethylene glycol acrylate with double bond end groups.

Embodiment 3

[0042] In an ice-water bath, dissolve 10 g of polyethylene glycol with a molecular weight of 2000 in 20 ml of dichloromethane, add 0.4 g of N, N-dimethylacetamide, and slowly add 0.5 g of acryloyl chloride dropwise; raise the temperature of the system to 35 ℃, under the protection of nitrogen for 8 hours; put the reaction solution in an ice-water bath, add 150ml of n-hexane, let it stand for 10-15 minutes, and filter under reduced pressure to obtain the phase-change monomer polyethylene glycol with double bond end groups Acrylate.

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Abstract

The invention provides a preparation method of a phase change monomer with double-bond end groups, which comprises the following steps of: in an ice water bath, dissolving PEG (Polyethane Glycol MW2000-10000) in dichloromethane, and then adding an acid binding agent (triethylamine or N,N-dimethylacetylamide) and acryloyl chloride; reacting at a temperature of 25-35 DEG C for 4-8h under the protection of nitrogen; adding a precipitant (n-hexane or diethyl ether) in reacting liquid in the ice water bath, settling for 10-15 minutes and leaching to obtain a finished product, wherein the molar ratio of the PEG to the acryloyl chloride is 1:(1-3), the molar ratio of the PEG to the acid binding agent is 1:(1-3), and the molar ratio of the PEG to the dichloromethane is 1:(0.312-0.546). The monomer has high activity and is easy to carry out copolymerization or grafting reaction with other monomers or polymers to prepare solid-solid phase change materials. The monomer has higher phase change enthalpy (163.21J/g), proper phase change temperature (46.53 DEG C) and higher thermal tolerance (320 DEG C). The preparation technology is simple, and the production cost is low.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of aliphatic macromolecule compounds with double bond end groups, and relates to the technology of preparing another monomer with double bonds by reacting a hydroxyl polymer with an acid chloride compound with a double bond structure. In addition, it also involves the application of phase change monomers. Background technique [0002] Phase change energy storage material is a new material developed in recent years. It utilizes the characteristics of energy absorption and energy release of certain substances during the phase change process to realize energy storage and utilization. Phase change materials can be used as energy storage. This characteristic has great significance in the fields of energy saving and temperature control. Phase change materials and their applications have become a wide range of research topics. Research involves many fields such as energy, materials, aerospac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/48C09K5/06C09K5/02
Inventor 张鸿王倩倩相恒学王晓磊刘辉杨淑瑞肖磊
Owner DALIAN POLYTECHNIC UNIVERSITY
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