A kind of pyroelectric flexible composite film and preparation method thereof

A composite membrane and pyroelectric technology, applied in the field of organic ferroelectric polymer materials, can solve the problems of fragile ferroelectric loss of ceramic materials

Inactive Publication Date: 2020-03-10
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The existing lead-based pyroelectric materials have a high pyroelectric coefficient, and have always had irreplaceable advantages in military and demanding fields. They are also an important direction for the development of high-performance pyroelectric materials, but ceramic materials are fragile. And the ferroelectric loss is large

Method used

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  • A kind of pyroelectric flexible composite film and preparation method thereof
  • A kind of pyroelectric flexible composite film and preparation method thereof
  • A kind of pyroelectric flexible composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Synthesis of lead titanate single crystal nanowires: firstly, 4mmolTi(OC 4 h 9 ) 4 Dissolve in 8ml of absolute ethanol, and then add the solution to 8ml of deionized water for hydrolysis to obtain a milky white suspension. Next, add 20mmolKOH, 5.2mmolPb(NO 3 ) 2 and 0.05g polyvinyl alcohol, and finally add deionized water to adjust the solution to 40ml mixed solution, add the mixed solution into a 50ml reaction kettle, stir at room temperature for 20min, and heat at 200°C for 4h to obtain a white powder, which is titanic acid Lead PX phase precursor. The lead titanate PX phase precursor was annealed at 540°C for 0.5h to make it exhibit ferroelectricity, thereby obtaining lead titanate single crystal nanowires with a perovskite structure with ferroelectric properties, and the obtained lead titanate single crystal nanowires It is a polycrystalline single crystal structure.

[0028] 2. Solution casting film: First, dissolve 0.05556g of lead titanate single crystal...

Embodiment 2

[0031] The specific process steps are the same as in Example 1, except that 0.21428 g of lead titanate single crystal nanowire powder is added in step 2 to obtain a pyroelectric flexible composite film with a composite amount of lead titanate single crystal nanowires of 30 wt%. .

Embodiment 3

[0033] The specific process steps are the same as in Example 1, except that 0.5 g of lead titanate single crystal nanowire powder is added in step 2 to obtain a pyroelectric flexible composite film in which the composite amount of lead titanate single crystal nanowires is 50 wt%. .

[0034] The thickness of the pyroelectric flexible composite membranes prepared in the above three examples is 100 μm, and its XRD patterns are as follows: figure 1 As shown, it can be seen that both P(VDF-TrFE) and PbTiO with pure β phase 3 Composite of single crystal nanowires. The SEM images of the pyroelectric thin films prepared in the three examples are shown in Figure 2, and they are all dispersed relatively uniformly, but the pyroelectric flexible composite film in Example 3 has a phase separation phenomenon, which has a certain impact on its performance. Multiple tests have determined that the compounding amount of lead titanate single crystal nanowires is 20wt%-40wt%, and the performanc...

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Abstract

The invention discloses a pyroelectric flexible composite film. The yroelectric flexible composite film is formed by lead titanate single-crystal nanowires and VDF (vinylidene fluoride) copolymers with the pyroelectric performance through composite hot-pressing, wherein the lead titanate single-crystal nanowires accounts for 10-45 wt%, and the rest is the VDF copolymers; the crystallinity of the VDF copolymers is 56% or above, and the crystal phase of the VDF copolymers is beta phase. The pyroelectric flexible composite film can meet the requirements for the high pyroelectric performance and the high flexibility, and the pyroelectric detection merit figure of the film can reach 26.98*10<-6> Pa<-1 / 2>.

Description

technical field [0001] The invention relates to the field of organic ferroelectric polymer materials, in particular to a pyroelectric flexible composite film and a preparation method thereof. Background technique [0002] The existing lead-based pyroelectric materials have a high pyroelectric coefficient, and have always had irreplaceable advantages in military and demanding fields. They are also an important direction for the development of high-performance pyroelectric materials, but ceramic materials are fragile. And the ferroelectric loss is large. With the development of pyroelectric materials and infrared detection technology, the application of various infrared detection equipment based on its research and development has expanded from the traditional military field to the field of people's livelihood, such as intrusion early warning, fire early warning, infrared temperature measurement, non-destructive testing, medical treatment, etc. Diagnosis, industrial productio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08K7/08C08L27/16
CPCC08J5/18C08J2327/16C08K7/08C08L2203/16C08L27/16
Inventor 王进杨清华石志勇
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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