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Method for modifying low electric field refrigeration performance of polyvinylidene fluoride ferroelectric polymer and its application

A technology of polyvinylidene fluoride and ferroelectric polymers, which is applied in the field of all-solid refrigeration, can solve the problems of lengthy reaction steps and complex electric card effect treatment process, reduce grain size, improve crystallization and electrical properties, reduce The effect of dielectric constant

Active Publication Date: 2022-06-21
SHANGHAI JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the defects of complex processing process and lengthy reaction steps in the existing technical process for improving the electric card effect of polymer materials, the present invention proposes a method for modifying polyvinylidene fluoride-based ferroelectric polymer low-electric field refrigeration performance and its application, and prepares Mild conditions, simple process, low cost and high reliability

Method used

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  • Method for modifying low electric field refrigeration performance of polyvinylidene fluoride ferroelectric polymer and its application
  • Method for modifying low electric field refrigeration performance of polyvinylidene fluoride ferroelectric polymer and its application
  • Method for modifying low electric field refrigeration performance of polyvinylidene fluoride ferroelectric polymer and its application

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Effect test

Embodiment 1

[0032] Preparation of Modified Polyvinylidene Fluoride-Vinyl Chlorofluoride Binary Copolymer

[0033] This embodiment includes the following steps: taking a double-necked round-bottomed flask, treating it with water and oxygen, weighing 1 g of polyvinylidene fluoride-chlorofluoroethylene P(VDF-CFE) (60 / 40mol%) binary copolymer, replacing gas for 3 times, and acetone solvent was added under nitrogen protection to fully dissolve the polymer at room temperature; 4.0 mL of hexamethylenetetramine was added dropwise to the reaction system, and the temperature was slowly raised to 40 °C, and the reaction was stirred for 2 h; after the reaction was completed , the reaction system was slowly cooled to room temperature, dropped dropwise into a mixed solution of ethanol and water with a volume ratio of 1:1, and the modified multi-component copolymer was obtained by precipitation; VDF-CFE) ferroelectric polymer. The test shows that 4.1K temperature change can be generated under the chang...

Embodiment 2

[0035] Preparation of Modified Polyvinylidene Fluoride-Chlorodifluoride Binary Copolymer

[0036] This embodiment includes the following steps: taking a double-necked round-bottomed flask, treating it with water and oxygen, weighing 1 g of polyvinylidene fluoride-chlorofluoroethylene P(VDF-CDFE) (66 / 34 mol%) binary copolymer, replacing Gas 3 times, N-methylpyrrolidone (NMP) solvent was added under nitrogen protection, and the polymer was fully dissolved at room temperature; 3.5 mL of diethylamine was added dropwise to the reaction system, and the temperature was slowly raised to 60 ° C, and the reaction was stirred for 45 min After the reaction, the reaction system was slowly cooled to room temperature, dropped dropwise into a mixed solution of ethanol and water with a volume ratio of 1.5:1, and the modified multi-component copolymer was obtained by precipitation; P(VDF-CDFE) ferroelectric polymer. The test shows that 6.3K temperature change can be generated under the change ...

Embodiment 3

[0038] Preparation of Modified Polyvinylidene Fluoride-Chlorotrifluoroethylene Binary Copolymer

[0039] This embodiment includes the following steps: taking a double-necked round-bottomed flask, treating it with water and oxygen, weighing 1 g of polyvinylidene fluoride-chlorofluoroethylene P(VDF-CTFE) (56 / 44 mol%) binary copolymer, replacing Gas 3 times, N,N-dimethylformamide (DMF) solvent was added under nitrogen protection, and the polymer was fully dissolved at room temperature; 4.2 mL of di-n-propylamine was added dropwise to the reaction system, and the temperature was slowly raised to 55 ° C , stirred for 1.5h; after the reaction, the reaction system was slowly cooled to room temperature, dropped dropwise into a mixed solution of ethanol and water with a volume ratio of 2:1, and the modified multi-component copolymer was precipitated to obtain the modified multi-component copolymer; repeated dissolving and washing three times, Finally, double bond modified P(VDF-CTFE) f...

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Abstract

A method for modifying polyvinylidene fluoride-based ferroelectric polymer low-electric field refrigeration performance and its application, by reacting polyvinylidene fluoride multi-polymer copolymer solution with an organic base to obtain double bond modified polyvinylidene fluoride-based ferroelectric Polymer, improve electrocardial effect under low electric field. Such modified polymers exhibit reduced correlation between polarized domains, reduced grain size, and the overall concentration of polarized domains, that is, the total crystallinity, remains unchanged or increased, thus exhibiting the potential of the electric card effect under low electric field. A substantial increase. The present invention produces double bonds by chemically modifying polyvinylidene fluoride copolymers containing chlorine elements, and has the advantages of simple process, short preparation period, mild reaction conditions and low cost, and the prepared polymer film has good uniformity And compactness, it can realize the adiabatic temperature change of the electric card effect greater than 6K under the low electric field of 50MV / m, and ensure long-life and stable operation, so as to meet the needs of the industrialization of electric card refrigeration materials and the application of related refrigeration systems.

Description

technical field [0001] The invention relates to a technology in the field of all-solid-state refrigeration, in particular to a method for modifying a polyvinylidene fluoride vinyl ferroelectric polymer material and its application, which have broad application prospects and can be used for reference by introducing other groups achieve a similar effect. For example, the introduction of small substituted groups, polar groups, and flexible groups to reduce the symmetry and regularity of the main chain, and the introduction of free radicals and other nucleating impurities to reduce the grain size and increase the crystallinity is expected to achieve higher Materials for the electric card effect. Background technique [0002] The P(VDF-TrFE-CFE) polymer material based on polyvinylidene fluoride is one of the most widely studied and best-performing electric card refrigeration materials. It can undergo a reversible order-disorder transition of dipoles under an electric field, res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F214/22C08F8/26H10N30/857
CPCC08F8/26C08F214/22
Inventor 钱小石郑珊瑜
Owner SHANGHAI JIAOTONG UNIV
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