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PPA type pectin self-healing hydrogel and preparation method of capacitance-type sensor thereof

A capacitive sensor, self-healing technology, applied in the direction of fluid pressure measurement, instrument, electromagnetic measurement device using capacitance change, to achieve stable performance, high resolution, and increase the effect of cross-linking

Inactive Publication Date: 2019-01-11
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The development of the times requires a sensor to have multiple recognition functions, but also requires the material to have the ability to heal itself, which is still a daunting challenge

Method used

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  • PPA type pectin self-healing hydrogel and preparation method of capacitance-type sensor thereof
  • PPA type pectin self-healing hydrogel and preparation method of capacitance-type sensor thereof
  • PPA type pectin self-healing hydrogel and preparation method of capacitance-type sensor thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take 2g of acrylic acid, 0.031g of pectin, 4mg of MBAA, 40mg of APS, and add FeCl with a concentration of 0-2.5mol% relative to the amount of acrylic acid 3 .6H 2O, stir in 10mL of aqueous solution for 30 minutes and mix evenly, pass nitrogen gas for 30 minutes to remove the gas in the solution, pour the solution into a polytetrafluoroethylene mold, polymerize at 60 degrees Celsius for 60 minutes, and obtain different Fe 3+ concentrated hydrogel. When the pectin content in the hydrogel is 6.2wt%, FeCl 3 .6H 2 When the O content is 0 mol%, it is labeled as PAA-PE hydrogel.

Embodiment 2

[0035] Change Example 1 to get 2g acrylic acid, 4mg MBAA, 40mg APS, 1.25mol% FeCl 3 .6H 2 O, add pectin that is 1.55-15.5wt% relative to the mass concentration of acrylic acid, stir in 10mL of aqueous solution for 30 minutes and mix evenly, pass nitrogen gas for 30 minutes to remove the gas in the solution, and polymerize at 60 degrees Celsius for 60 minutes to obtain Hydrogels with different pectin concentrations. When the pectin content is 0wt%, FeCl 3 .6H 2 When the O content is 0 mol%, it is labeled as PAA hydrogel. When the pectin content is 1.55wt%, FeCl 3 .6H 2 When the O content is 1.25mol%, it is labeled as PAA-PE / Fe 3+ Hydrogels.

Embodiment 3

[0037] First of all, the specific method of making the PDMS layer is as follows: mix the PDMS uniformly according to the mass ratio: 10:1 (the American Dow Corning Sylgard184 silicone rubber is a two-component kit composed of liquid components, and the density is 1.04g / ml) to mix the mixture evenly, and then Degas to remove air bubbles, pour the uncured mixture into a polytetrafluoroethylene mold, and after heating at 80 °C for 1 hour, a PDMS film with a thickness of 10 mm × 20 mm and a thickness of 0.352 mm can be formed. Take the above PDMS as the middle layer, with PAA-PE / Fe of the same size on both sides 3+ Hydrogel, the three are closely attached, and a copper wire is sandwiched between the hydrogel and PDMS interlayers, so that the two copper wires are at the opposite positions. A capacitive pressure sensor with a "sandwich" structure of self-healing hydrogel at both ends and polydimethylsiloxane (PDMS) as the middle dielectric layer was obtained. Finally, the manufactu...

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Abstract

The invention belongs to the technical field of novel materials and sensors and discloses a PPA type pectin self-healing hydrogel and a preparation method of a capacitance-type sensor thereof. The PPAtype pectin self-healing hydrogel prepared by adding ferrum ions to form coordination, heating the mixture to carry out free radical polymerization reaction to generate a uniform double-layered three-dimensional netty structure by taking acrylic acid and pectin as a base material has good mechanical properties and also has a quick self-healing characteristic. In order to make full use of the hydrogel, a capacitance-type pressure sensor or a capacitance-type stress sensor of a sandwich structure, two ends of which is the self-healing hydrogel and the middle dielectric layer of which is polydimethylsiloxane (PDMS) or a VHB adhesive tape (3M4920), is manufactured. The method of preparing the capacitance-type sensor by using the PPA type pectin self-healing hydrogel is simple to operate, widein source of raw materials, has good electrochemical and mechanical properties and has a wide application prospect in the field of flexible energy storage materials.

Description

technical field [0001] The invention belongs to the technical field of new materials and sensors, and in particular relates to a preparation method of a PAA pectin self-healing hydrogel and a capacitive sensor. Background technique [0002] Since the 1940s, research on hydrogels in the fields of bionics, chemistry, and medicine has never stopped. As a soft and wet material, hydrogel is a high molecular polymer with cross-linked structure, which is hydrophilic but insoluble in water, and can absorb a large amount of water, using water as the dispersion medium. Hydrogel has good water permeability and biocompatibility. As a human implant, it can reduce adverse reactions. Hydrogel also has very similar properties to many active tissues of the human body, such as human joint lubricating cartilage, muscle tissue, etc. , making hydrogel the most ideal substitute material for artificial joints, and also the most ideal substitute material for the development of artificial joints. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08F251/00C08F220/06C08F222/38G01B7/16G01L1/14G01L9/12
CPCC08F251/00C08J3/075G01B7/22G01L1/142G01L9/12C08F220/06C08F222/385
Inventor 丁建宁戴胜平袁宁一
Owner CHANGZHOU UNIV
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