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Crystalline modified method for transfering phase polymer in magnetic-force-electro-coupling effect

A polymer and crystalline polymer technology, applied in the direction of device material selection, etc., can solve the problems of low piezoelectric performance and magnetoelectric performance

Inactive Publication Date: 2005-08-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention mainly solves the problems of existing composite materials of piezoelectric ceramics, polymers and ferromagnetic materials, piezoelectric ceramics and polymer composites with low piezoelectric performance and magnetoelectric performance due to the stress loss of polymers, and provides a Improve the piezoelectric performance and magnetoelectric performance of piezoelectric ceramics, polymers and ferromagnetic material composites, piezoelectric ceramics and polymer composites by crystallization modification of polymers

Method used

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  • Crystalline modified method for transfering phase polymer in magnetic-force-electro-coupling effect
  • Crystalline modified method for transfering phase polymer in magnetic-force-electro-coupling effect

Examples

Experimental program
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Embodiment 1

[0019] Dissolve isotactic PVC with cyclohexanone solvent, use the solution to spray dry ordinary PVC powder, and heat-treat at 100°C for 4 hours to obtain crystalline PVC powder. The crystalline PVC is pulverized by a jet mill to obtain nanocrystalline PVC powder of 5-20 μm, wherein the crystal grains in the nanocrystalline PVC powder are less than 100 nm. Hot press molding, the hot press molding time is 25min, and the pressure is 10MPa. Piezoelectric constant d of crystalline PVC and PZT composites and common PVC and PZT composites 33 The relationship curve with polymer volume fraction is shown in figure 1 . It can be seen from the figure that the piezoelectric performance of crystalline PVC and PZT composites is higher than that of ordinary PVC and PZT composites.

Embodiment 2

[0021] Dissolve isotactic PVC with cyclohexanone solvent, use the solution to spray dry ordinary PVC powder, heat treat at 120°C for 2 hours, and obtain crystalline PVC powder. The crystalline PVC is pulverized by a jet mill to obtain 5-20 μm nanocrystalline PVC micropowder, wherein the crystal grains in the nanocrystalline PVC micropowder are less than 100 nm, and crystalline PVC with a crystallinity of 15-30% is obtained. The crystalline PVC, PZT and terfenol-D (Terfenol-D) were hot-pressed at 155°C at a volume ratio of 30:64:6, the molding time was 10min, the pressure was 20MPa, and the magnetoelectric conversion coefficient of the composite material αE 33 It is 60mV / cm Oe, and the composite material composed of ordinary PVC, PZT and Terfenol-D cannot be tested for magnetic and electrical properties.

Embodiment 3

[0022] Example 3: PVDF and PZT are hot-pressed at 170°C according to the volume ratio of 30:70, the time is 30min, and the pressure is 10MPa. After forming, it is divided into two parts, and one part of the composite material is quenched, and the crystallization of PVDF in the PZT and PVDF composite material degree at 21%, see figure 2 , the piezoelectric constant d of the composite 33 is 40pC / N; another composite material was annealed at 120°C for 6 hours under pressure at 10MPa, and the crystallinity of PVDF in the obtained PZT and PVDF composite material was 27%, see figure 2 , the piezoelectric constant d of the composite 33 It is 75pC / N.

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Abstract

A crystalline modifying method for the polymer used for piezoelectric ceramic-polymer composition and ferromagnetic material-polymer composition to improve their piezoelectric or ferromagnetic performance includes such steps as preparing nucleator solution of non-crystal polymer, spraying it onto non-crystal polymer powder, heat treating, airflow grinding, proportionally mixing it with piezoelectric ceramic powder and ferromagnetic powder, cold die pressing, hot die pressing and annealing.

Description

Technical field: [0001] The invention relates to a method of reducing the stress loss in the magnetic-mechanical-electrical coupling effect by changing the structure of the transfer phase polymer in the magnetic-mechanical-electrical coupling effect, thereby improving the piezoelectric ceramics, polymers and ferromagnetic material composite materials, and the pressure is high. The piezoelectric and magnetoelectric properties of electroceramics and polymer composites, and the method to solve the problem that the transfer phase as an inert phase affects the functionality of composite materials. Background technique: [0002] Ferroelectric, ferromagnetic and polymer composite materials not only have the piezoelectric effect of ferroelectric materials and the magnetostrictive effect of ferromagnetic materials, but also have magnetoelectric properties through the magnetic-force-electric coupling of ferroelectric and ferromagnetic phases. Since it is difficult to compound ferroele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/00C08L23/02C08L27/06C08L27/16C08L29/14C08L33/12C08L77/00H01L41/16
Inventor 董丽杰熊传溪权红英
Owner WUHAN UNIV OF TECH
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