US 10,625,473 B2Granted

Ferroelectric polymer electrocaloric material and preparation method thereof

AssigneeHuazhong University of Science and Technology

InventorsGuangzu Zhang, Zhaoyao Hu, Lingxi Weng, Shenglin Jiang, Mingyu Li

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Abstract

A ferroelectric polymer electrocaloric nanowire array and a preparation method thereof, in which the ferroelectric polymer electrocaloric material is formed by a polyvinylidene fluoride (PVDF)-based ferroelectric polymer electrocaloric nanowire array embedded in a porous anodic aluminum oxide (AAO) template. The PVDF-based ferroelectric polymer electrocaloric material is controlled to form a nanowire array embedded in the porous AAO template, and through adopting of a solution infiltration method to prepare the ferroelectric polymer electrocaloric nanowire array in the porous AAO template and improvement of the key morphology, structure, internal microscopic connection construction of the ferroelectric polymer, problems, such as low electrocaloric strength of the ferroelectric polymer, difficult heat conduction in the electrocaloric material and low refrigerating power density of the electrocaloric device in the prior art, can be effectively solved.

Claims9

Dependent claims

A preparation method of a ferroelectric polymer electrocaloric material embedded in a porous anodic aluminum oxide (AAO) template, the method comprising the following steps of:

A, annealing a porous AAO template at an annealing temperature of 600 deg C. to 1300 deg C. so as to increase thermal conductivity of the porous AAO template;
B, dissolving a polyvinylidene fluoride (PVDF)-based ferroelectric polymer as raw material into a solvent to obtain a homogeneously mixed ferroelectric polymer solution;
C, allowing the ferroelectric polymer solution to infiltrate and penetrate through pores of the annealed porous AAO template obtained in step A;
D, volatilizing the solvent of the ferroelectric polymer solution in the porous AAO template under vacuum heating conditions;
and
E, annealing the porous AAO template obtained in step D in an oven so that a ferroelectric polymer electrocaloric material embedded in the porous AAO template is obtained, wherein the porous AAO template obtained in step E is configured for use along with the embedded material in a refrigeration device as a high-speed heat conductor.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/972,658Filed 7 May 2018
Priority: CN 2018 1 013456619 Feb 2018
Published: US 2019/0248708 A115 Aug 2019
Granted: 21 Apr 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification32 codes

B29C 66/7422
To metals or their alloys: aluminium or alloys of aluminium
C04B 41/009
After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone: characterised by the material treated
B29C 44/1209
Incorporating or moulding on preformed parts, e.g. inserts or reinforcements: by impregnating a preformed part, e.g. a porous lining
B29C 67/202
For porous or cellular articles, e.g. of foam plastics, coarse-pored: comprising elimination of a solid or a liquid ingredient