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Stable high-strength conducting fibroin gel in natural environment and preparation method of gel

A technology of silk protein and natural environment, which is applied in the field of high-strength conductive natural biomacromolecule gel and its preparation, can solve the problems of poor mechanical properties, uneven distribution, and large size of β-sheet aggregates in hydrogel, and achieve Excellent mechanical properties, cost reduction, and easy recycling

Inactive Publication Date: 2018-05-15
FUDAN UNIV
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  • Description
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Problems solved by technology

However, the mechanical properties of silk protein hydrogels prepared by this method are usually poor, because water is not a good solvent for silk protein, and the process of conformational transformation of silk protein in its aqueous solution is uncontrollable, and the formed β-sheet aggregates Usually large in size and unevenly distributed, which greatly affects the mechanical properties of the final hydrogel

Method used

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  • Stable high-strength conducting fibroin gel in natural environment and preparation method of gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1, degummed mulberry silk was dissolved in 1-ethyl-3-methylimidazolium acetate (EMImAc) ionic liquid to prepare a mulberry silk protein ionic liquid solution (RSF / EMImAc) with a mass fraction of 10 wt%. Take 15 g of the above-mentioned mulberry silk protein ionic liquid solution, add 15 g, 40 % (v / v) ethanol aqueous solution under gentle stirring, and after uniform mixing, the solution is centrifuged (8000 r / min, 8 min) to remove air bubbles, and then it is Stored in a sealed environment at 25°C, a silk protein gel with good mechanical properties (solid content 5 wt%) was obtained. The compressive modulus and tensile modulus reached 0.6 MPa and 0.5 MPa, respectively, and the tensile strength and elongation at break rates are 0.12 MPa and 80 %, respectively. Tests have shown that the gel can conduct electricity, with an ionic conductivity of 7.5 mS / cm at room temperature. The gel will not dry out after being placed in the natural environment for more than two ye...

Embodiment 2

[0025] Example 2, the degummed mulberry silk was dissolved in 1-ethyl-3-methylimidazolium acetate (EMImAc) ionic liquid to prepare a mulberry silk protein ionic liquid solution (RSF / EMImAc) with a mass fraction of 15 wt%. Take 5.8 g of the above-mentioned mulberry silk protein ionic liquid solution, add 5.8 g of 20 % (v / v) ethanol aqueous solution under gentle stirring, and after uniform mixing, the solution is centrifuged (8000 r / min, 8 min) to remove air bubbles, and then It was sealed and stored at 37°C to obtain a high-strength silk protein gel (solid content 7.5 wt%), its compressive modulus and tensile modulus reached 1.8 MPa and 1.6 MPa, respectively, and the tensile strength and elongation at break rates are 0.24 MPa and 110 %, respectively. Tests show that the gel can conduct electricity, and its ionic conductivity at room temperature is 2.6mS / cm. The gel will not dry out after being placed in the natural environment for more than two years, and its performance is st...

Embodiment 3

[0026] Example 3, the degummed mulberry silk was dissolved in 1-ethyl-3-methylimidazolium acetate (EMImAc) ionic liquid to prepare a mulberry silk protein ionic liquid solution (RSF / EMImAc) with a mass fraction of 20 wt%. Take 10 g of the above mulberry silk protein ionic liquid solution, slowly add 2 g of EMImAc ionic liquid under gentle stirring, and then slowly add 8 g of deionized water into it after stirring evenly, and centrifuge the solution after uniform mixing (8000 r / min, 8min) to remove air bubbles, and then put it at 50°C for sealed storage to obtain a high-strength silk protein gel (solid content: 10 wt%), and its compressive modulus and tensile modulus reached 3.7 MPa and 3.1 MPa, respectively. , the tensile strength and elongation at break were 0.41 MPa and 147%, respectively. Tests have shown that the gel can conduct electricity, with an ionic conductivity of 1.1 mS / cm at room temperature. The gel will not dry out after being placed in the natural environment ...

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Abstract

The invention discloses a stable high-strength conducting fibroin gel in a natural environment and a preparation method of the gel. Fibroin denaturation solvents mutually soluble with ionic liquid areadded into fibroin ionic liquid solution, so that fibroin is subjected to conformation transformation in the mixed solvents, and a physical crosslinking network is further formed, namely, the stablehigh-strength conducting fibroin gel in the natural environment is prepared. The preparation method is simple, green, mild, high in efficiency and low in cost, energy is saved, and the mechanical property of the final gel can be regulated by changing solid content or types and the content of the denaturation solvents (or changing the proportion of the denaturation solvents to the ionic liquid). The prepared fibroin gel is high in strength, good in toughness and stable in performance, has conductivity, cannot run dry in long-time placement in the natural environment, can serve as a gel electrolyte material without sealing, and has application values in a plurality of fields.

Description

technical field [0001] The invention belongs to the technical field of natural macromolecular materials, and in particular relates to a high-strength conductive natural biomacromolecular gel stable in a natural environment and a preparation method thereof. technical background [0002] Electrolytes are an important part of electrochemical devices, and there have been many reports on the research of electrolytes. In order to solve the leakage and drying problems of liquid electrolytes, many researchers try to replace traditional liquid electrolytes with solid electrolytes or gel electrolytes. However, solidifying the electrolyte may reduce its ion mobility, thereby affecting the functionality of electrochemical devices. In this regard, gel electrolytes with high ion mobility and good dimensional / mechanical stability are superior to all solid-state electrolytes. [0003] Ionic liquids have many advantages such as high chemical stability, wide liquid temperature range, high t...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08J3/09C08L89/00
CPCC08J3/075C08J3/096C08J2389/00
Inventor 邵正中姚萌陈新
Owner FUDAN UNIV
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