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Preparation method and application of PVDF-TrFE chitosan hydrogel

A technology of hydrogel and cross-linked chitosan, which is applied to the measurement of the force of piezoelectric devices, electromagnetic measuring devices, instruments, etc., can solve the problems of heterogeneous phase separation or aggregation of conductive fillers, and performance degradation. Achieve the effect of low cost and simple preparation process

Pending Publication Date: 2021-12-24
ZHONGBEI UNIV
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Problems solved by technology

However, simple mixing methods often lead to heterogeneous phase separation or aggregation of conductive fillers, resulting in reduced performance

Method used

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  • Preparation method and application of PVDF-TrFE chitosan hydrogel
  • Preparation method and application of PVDF-TrFE chitosan hydrogel
  • Preparation method and application of PVDF-TrFE chitosan hydrogel

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Embodiment 1

[0044] Technical solutions

[0045]The chemical substance material used is: chitosan quaternary ammonium salt, epichlorohydrin, sodium hydroxide, hydrochloric acid, glycerol, PVDF-TrFE fibrous, PEDOT:PSS and deionized water, and its combined preparation dosage is as follows: grams, milliliters, centimeters 3 as a unit of measurement

[0046] Chitosan quaternary ammonium salt: HACC solid solid 99.5% 2.0g±0.001g

[0047] Epichlorohydrin: C 3 h 5 ClO liquid liquid 99.5% 4mL±0.001mL

[0048] Sodium hydroxide: NaOH solid solid 99.5% 5g±0.001g

[0049] Hydrochloric acid: HCl liquid liquid 99.5% 23mL±0.001mL

[0050] Glycerol: C 3 h 8 o 3 Liquid Liquid 99.5% 1mL±0.001mL

[0051] PVDF-TrFE Fibrous 99.5% 100-500mg

[0052] PEDOT:PSS liquid solid 99.5% 5ml

[0053] Deionized water: H 2 O liquid liquid 99.99% 5000mL±50mL

[0054] Such as figure 1 Shown, a kind of preparation method of PVDF-TrFE chitosan hydrogel comprises the steps:

[0055] S1), preparation of PVDF-TrFE / ...

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Abstract

The invention relates to the field of piezoelectric piezoresistive composite flexible sensor preparation, in particular to a preparation method and application of PVDF-TrFE chitosan hydrogel. PEDOT: PSS is used as a conductive filler, PVDF-TrFE is used as a piezoelectric material, and a crosslinked chitosan quaternary ammonium salt solution with good biocompatibility is used as a flexible network skeleton, and thermal gel forming is conducted to obtain the PVDF-TrFE / crosslinked chitosan quaternary ammonium salt hydrogel. The preparation process is simple and convenient, the cost is low, the prepared hydrogel also has certain mechanical strength and strain sensing performance, has a piezoelectric effect and a piezoresistive effect, can detect static force and dynamic force at the same time, can achieve mutual conversion, and provides a new thought for construction of stretchable and high-sensitivity strain sensing conductive hydrogel.

Description

technical field [0001] The invention relates to the field of preparation of piezoresistive composite flexible sensors, in particular to a preparation method and application of a PVDF-TrFE chitosan hydrogel. Background technique [0002] Existing flexible strain sensors are mainly divided into two categories: piezoelectric and piezoresistive. The piezoelectric sensor has a fast response time and is suitable for the detection of dynamic signals, such as transient force changes, deformation speed, etc., but the piezoelectric sensor signal cannot reflect the final force state and strain state of the object. The superiority of the piezoresistive sensor is often reflected in the detection of static force, and the force state and deformation state of the object can be detected in real time according to the magnitude of the current value. However, piezoresistive sensors also have shortcomings such as not being able to sense the force direction and bending strain direction of the ob...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08L51/00C08L5/08C08L65/00C08L25/18C08K5/053G01B7/16G01L1/16G01L1/22
CPCC08J3/075G01B7/16G01B7/18G01L1/16G01L1/22C08J2351/00C08J2305/08C08J2365/00C08J2325/18C08K5/053
Inventor 李洁胡智锐魏晓童王晨韩晶李迎春王文生
Owner ZHONGBEI UNIV
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