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A solid-solid supramolecular phase change material and its preparation method and application

A technology of phase change materials and supramolecules, applied in the field of phase change materials and their preparation, ultra-light porous solid-solid phase change materials and their preparation, can solve the limitations of mass production, low latent heat of materials, and quality factors and other problems, to achieve the effect of excellent degradability and rich pore structure

Active Publication Date: 2022-03-08
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the latent heat of the material prepared by this method is low, and the use temperature range is limited by the capsule
Another method is the chemical cross-linking method, such as the commonly used polyethylene glycol phase change materials, through chemical cross-linking, a wide variety of solid-solid phase change materials can be prepared, but this method involves complex chemical processes and expensive raw materials. Large-scale preparation is limited, and the molecular structure is also affected
In addition, traditional phase change materials have a dense structure and high density, and their application in the aerospace field is easily limited by quality factors

Method used

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  • A solid-solid supramolecular phase change material and its preparation method and application
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  • A solid-solid supramolecular phase change material and its preparation method and application

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preparation example Construction

[0033] Another aspect of the embodiments of the present invention provides a method for preparing a solid-solid supramolecular phase change material comprising:

[0034] The aqueous solution containing polyethylene glycol is mixed with macrocyclic molecules to form a mixed solution, wherein the macrocyclic molecules include any one or more than two of crown ether, α-cyclodextrin, and γ-cyclodextrin combination;

[0035] The mixed solution is left to stand, so that the polyethylene glycol and the macrocyclic molecule undergo supramolecular self-assembly, and the hydrophobic polyethylene glycol chain formed during the self-assembly process is inserted into the cavity of the hydrophobic macrocyclic molecule, and the macrocyclic molecule passes through Hydrogen bond interaction stacking and physical crosslinking form a hydrogel, followed by solvent replacement and drying to obtain a solid-solid supramolecular phase change material.

[0036] The design concept of the present inven...

Embodiment 1

[0060] (1) Synthesis of physical gel: Take 1 mole of polyethylene glycol with a molecular weight of 60,000 and configure it to a concentration of 0.05g / cm 3 aqueous solution, followed by the addition of 1 mmol of α-cyclodextrin, and stirred evenly. After standing at room temperature for 24 hours, a physical gel (ie, the aforementioned hydrogel) was formed.

[0061] (2) Solvent replacement of the colloid: place the formed physical gel in 5 times the volume of acetone, change the acetone every 12 hours, and obtain the acetone colloid after 3 times of replacement.

[0062] (3) Drying: raise the temperature of the replaced acetone colloid to 42°C, pressurize it to 9MPa, reach a supercritical state, and then equilibrate for 10 hours, then slowly lower the temperature to remove the acetone in the form of gas, and the cooling rate is 1°C / min (°C per minute ), to prepare solid-solid supramolecular phase change materials. Characterized by BET isothermal adsorption, it can be found th...

Embodiment 2

[0064] (1) Synthesis of physical gel: take 1 mole of polyethylene glycol with a molecular weight of 100,000, and configure it to a concentration of 0.10g / cm 3 aqueous solution, followed by adding 10 mmol of γ-cyclodextrin, and stirring evenly. After standing at room temperature for 30 hours, a physical gel was formed.

[0065] (2) Solvent replacement of the colloid: place the formed physical gel in 4 times the volume of acetone, change the acetone every 8 hours, and obtain the acetone colloid after 5 times of replacement.

[0066] (3) Drying: raise the temperature of the replaced acetone colloid to 40°C, pressurize to 10MPa, reach the supercritical state and equilibrate for 10 hours, then slowly lower the temperature to remove the acetone in the form of gas, the cooling rate is 1°C / min (°C per minute ), to prepare solid-solid supramolecular phase change materials. Characterized by BET isothermal adsorption, it can be found that the solid-solid supramolecular phase change mat...

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Abstract

The invention discloses a solid-solid supramolecular phase change material as well as a preparation method and application thereof. The preparation method comprises: mixing an aqueous solution containing polyethylene glycol with a macrocyclic molecule to form a mixed solution, and then standing it for treatment so that the polyethylene glycol and the macrocyclic molecule undergo supramolecular self-assembly to form a hydrogel, and then carry out Solvent replacement and drying treatment to obtain solid-solid supramolecular phase change materials. The preparation method of the solid-solid supramolecular phase change material provided by the present invention breaks through the limitation that the solid-solid phase change material relies on encapsulation (combination of chemical and physical methods) and chemical crosslinking by introducing the supramolecular concept; in addition, The highlight brought by this preparation method is to reduce the density of the phase change material to 0.250g / cm 3 The following, with excellent degradability and rich pore structure, no liquefaction and leakage, and no chemical cross-linking network, is a green, light, degradable new phase change temperature regulating material, leading to a new class of phase change materials The birth of variable material.

Description

technical field [0001] The invention relates to a phase change material and a preparation method thereof, in particular to an ultra-light porous solid-solid phase change material based on physical crosslinking, a preparation method and application thereof, and belongs to the technical field of phase change materials. Background technique [0002] Phase change materials refer to substances that undergo phase transitions under constant temperature conditions and can provide latent heat. Phase transition is generally a crystalline substance that absorbs heat from a solid state to a liquid state, obtains a liquid state, releases heat, and transforms into a crystalline solid state. This reversible process involves the storage and release of energy while maintaining a constant temperature. Therefore, it has a wide range of applications in the field of temperature regulation. , belongs to a class of important materials for energy saving and environmental protection. Phase change m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00C09K5/14
CPCC08G83/008C09K5/14
Inventor 王锦方强李清文
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI