Method for improving piezoelectric response of polymer materials

A technology of polymer materials and polymer films, applied in applications, flat products, household appliances, etc., to achieve the effect of small modulus, low density, and not easy to break

Pending Publication Date: 2021-06-29
UNIV OF SCI & TECH OF CHINA
View PDF26 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the piezoelectric properties of current polymer piezoelect

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for improving piezoelectric response of polymer materials
  • Method for improving piezoelectric response of polymer materials
  • Method for improving piezoelectric response of polymer materials

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0041] The preparation method of the polymer film is not particularly limited to the preparation method of the polymer film, and a method known to those skilled in the art. In the present invention, a flat polymer film can be prepared by a watery membrane process, and the film is prepared by a mold in a certain temperature and pressure, a triangular structure having a certain curvature radius of curvature can be prepared. In the present invention, a plurality of non-planar structures can also be prepared in both a non-planar surface.

[0042] See image 3 , image 3 A mold photograph of the prepared non-planar polymer film is provided for the present invention. Among them, when the non-planar polymer film is prepared, the polymer film material is cast in the mold, and the two parts of the mold are extruded, i.e., a non-plane polymer film.

[0043] in image 3 The mold provided by (a) can prepare a polymer film having a plurality of arched structures, a portion of the arched structure...

Example Embodiment

[0062] Example 1:

[0063] Different mass (0.3 g, 0.56 g, 0.95 g) of P (VDF-TRFE) powder were dissolved in a certain volume (10 mL) dimethylformamide solvent, stirred until it was clear, and the transparent liquid is obtained, and can be controlled by controlling the polymer. The mass volume of the powder and solvent is prepared by the preparation of a series of different thicknesses (wherein the concentration of 0.3 g / 10 ml of solution is prepared to obtain a film having a thickness of 43 μm, a concentration of 0.95 g / 10 ml. The solution was prepared from a film having a thickness of 73 μm). The solution was poured on the glass sheet in the oven, and dried under 90 ° C. The evapoated film was teared from the glass, and the heat treatment was used directly or was carried out at 140 ° C for 5 hours to obtain a higher crystallinity. The obtained membrane can be cut into different sizes as needed. The film is placed in the mold and places the mold in a hot press of 80 ° C to give...

Example Embodiment

[0068] Example 2

[0069] A polymer flat film having a thickness of 23 μm was obtained in accordance with the preparation method in Example 1. The above film was prepared by the mold to prepare an arched film having a radius of curvature of 10 mm.

[0070] In order to perform electrical performance test, the upper gold electrode is prepared on the upper and lower surface of the film, and the film is polarized under the DC voltage before the test, and the polymer is respectively obtained according to the polarization conditions (polarization electric field, temperature and time) given in Table 2. Film is polarized, and according to Figure 4 Test method for testing.

[0071] The pleat structure and stress concentration are generated by applying the arched film to the upper and lower surfaces of the arched film. The piezoelectric response of the arched film under different polarization conditions can be seen in Table 2, the larger the polarization electric field under the conditions ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Heightaaaaaaaaaa
Heightaaaaaaaaaa
Login to view more

Abstract

The invention provides a method for improving piezoelectric response of polymer materials. A non-planar polymer film is polarized and pressure is applied to the film, so that folds and large-displacement deformation of the polymer films occur. Because the polymer materials are low in density, small in modulus and good in flexibility, the polymer materials are applied to devices, and the improved piezoelectric response based on high stress and improvement of stress can be achieved. Moreover, the mechanical reliability of the polymer is good, and under the effect of external force, breakage is difficult to form; and therefore, through applying the pressure on the non-planar polymer film, large-deformation folds and large uneven strain of the polymer films are produced, the stress is focused in a specific zone of the film, and the large uneven strain is produced, so that high piezoelectric response is produced.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a method for improving the piezoelectric response of polymer materials. Background technique [0002] Piezoelectric materials are polar materials that generate charges in response to mechanical deformation (positive effect) and change shape under an electric field (reverse effect). Piezoelectric materials have important applications in the fields of sensors, actuators, converters and energy harvesting devices. Inorganic piezoelectric materials, especially lead zirconate titanate-based materials, have been widely used due to their high piezoelectric coefficient, and their piezoelectric coefficient d 33 Up to several hundred pC / N. But their fragility and high density limit their applications. Now flexible electronic materials and wearable materials (especially PVDF-based polymers) are developing rapidly. PVDF-based polymer materials have good flexibility...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B29C59/10B29C59/02B29L7/00
CPCB29C59/10B29C59/021B29K2995/0003B29L2007/00
Inventor 初宝进胡欣萍
Owner UNIV OF SCI & TECH OF CHINA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap