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Three-functional-group hyperbranched polysiloxane cross-linked high-strength and high-toughness composite hydrogel and preparation method thereof

A composite hydrogel and polysiloxane technology, applied in the field of polymer materials, can solve the problem that the mechanical properties of hydrogel cannot be strengthened and toughened, the strength and toughness of hydrogel cannot be effectively balanced, and the mechanical properties of hydrogel cannot be effectively balanced. Problems such as performance enhancement and imbalance between parameters, to achieve the effects of controllable group designability, excellent low toxicity, and strong group designability

Active Publication Date: 2021-08-03
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, the strength and toughness of the resulting hydrogel cannot be effectively balanced.
The main reason is that the ratio between the groups of the difunctional hyperbranched polysiloxane tends to increase and decrease, so it is difficult for each interaction (covalent bonding and chemical bonding) to achieve a synergistic effect.
Secondly, the amino groups on the molecular chain of chitosan have low activity and cannot form sufficient bonding with the polymer chain, and the reinforcing effect of the polymer itself cannot be compared with nanomaterials or ion crosslinking.
Therefore, using it as a crosslinking agent cannot truly strengthen the mechanical properties of hydrogels.
[0005] In summary, the existing crosslinking agents cannot take into account the enhancement of hydrogel mechanical properties and the imbalance between parameters.

Method used

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  • Three-functional-group hyperbranched polysiloxane cross-linked high-strength and high-toughness composite hydrogel and preparation method thereof
  • Three-functional-group hyperbranched polysiloxane cross-linked high-strength and high-toughness composite hydrogel and preparation method thereof
  • Three-functional-group hyperbranched polysiloxane cross-linked high-strength and high-toughness composite hydrogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Preparation of hyperbranched polysiloxane containing vinyl, epoxy and alkyl groups simultaneously.

[0037] In molar ratio, mix 1mol of γ-methacryloxypropyltrimethoxysilane, 0.3mol of 3-glycidyl etheroxypropyltrimethoxysilane, 0.4mol of methyltrimethoxysilane with 2.3 mol of distilled water was mixed evenly, and 8 mol of absolute ethanol was added, and then hydrochloric acid was slowly added dropwise under stirring condition to adjust the pH value of the solution to 3; Vacuum-dried to obtain a hyperbranched polysiloxane containing vinyl, epoxy and alkyl groups.

[0038] 2) By weight, add 1 g of phosphorylated cellulose nanofibril solution with an aspect ratio of 30:1 and 11 g of N-isopropylacrylamide into a container at room temperature, add 60 ml of water, and mix to form a uniform solution.

[0039] 3) Add 0.2 ml of the hyperbranched polysiloxane prepared in step 1) and 1.1 mg of potassium persulfate to the solution obtained in step 2) in an ice bath, and stir to ...

Embodiment 2

[0041] 1) Preparation of hyperbranched polysiloxane containing vinyl, epoxy and alkyl groups simultaneously.

[0042] In molar ratio, mix 0.5mol of vinyltrimethoxysilane, 0.2mol of 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 0.15mol of methyltrimethoxysilane with 1.5 mol of distilled water was mixed evenly, and 4 mol of absolute ethanol was added, and then acetic acid was slowly added dropwise under stirring condition to adjust the pH value of the solution to 4; Vacuum-dried to obtain a hyperbranched polysiloxane containing vinyl, epoxy and alkyl groups.

[0043] 2) By weight, add 1 g of hydroxylated cellulose nanofibrils with an aspect ratio of 20:1 and 30 g of N-methylolacrylamide into a container at room temperature, add 150 ml of water, and mix to form a uniform solution.

[0044] 3) Add 0.2ml of the hyperbranched polysiloxane prepared in step 1) and 0.5mg of potassium persulfate to the solution obtained in step 2) in an ice bath, and stir to form a uniform solution. R...

Embodiment 3

[0046] 1) Preparation of hyperbranched polysiloxane containing vinyl, epoxy and alkyl groups simultaneously.

[0047] In molar ratio, 1mol of γ-methacryloxypropyltriethoxysilane, 0.35mol of 3-glycidyl etheroxypropyltrimethoxysilane, 0.35mol of propyltrimethoxysilane and Mix 2.6 mol of distilled water evenly, add 6.8 mol of absolute ethanol, then slowly add p-toluenesulfonic acid dropwise under stirring condition to adjust the pH of the solution to 5; after the dropwise addition, raise the temperature to 42°C, and react under nitrogen protection for 5 hours; After the reaction is completed, the hyperbranched polysiloxane containing vinyl groups, epoxy groups and alkyl groups is obtained through vacuum drying.

[0048] 2) By weight, add 1 g of phosphorylated cellulose nanofibrils with an aspect ratio of 60:1 and 55 g of N-isopropylacrylamide into a container at room temperature, add 190 ml of water, and mix to form a uniform solution.

[0049] 3) Add 0.2ml of the hyperbranched ...

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Abstract

The invention discloses a three-functional-group hyperbranched polysiloxane crosslinked high-strength and high-toughness composite hydrogel and a preparation method thereof. The preparation method comprises the following steps: 1) adding 1 part by weight of cellulose nanofibril and 1-30 parts by weight of acrylamide and / or acrylate monomers into a container, adding 60-300 parts by weight of water, and conducting mixing to form a uniform solution; 2) under the condition of ice-water bath, adding 0.1-1 part by weight of hyperbranched polysiloxane with three functional groups simultaneously containing vinyl, epoxy group and alkyl and 0.0005-0.002 part by weight of initiator into the solution obtained in the step 1), uniformly conducting stirring, and conducting reacting at 25-60 DEG C for 4-48 hours to obtain high-strength and high-toughness composite hydrogel. The molar ratio of vinyl, epoxy group and alkyl in the three-functional-group hyperbranched polysiloxane is 10:(1-6):(1-6).

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a high-strength and high-toughness composite hydrogel crosslinked by trifunctional hyperbranched polysiloxane and a preparation method thereof. Background technique [0002] Hydrogel is a "soft and wet material" with a three-dimensional network structure and a large amount of water. Because of its excellent hydrophilicity, biocompatibility, reversible swelling and other advantages, it is widely used in tissue engineering, membrane separation, biological There are a wide range of applications in areas such as sensors and drug release. However, compared with the high mechanical properties of natural "soft materials" in nature, the non-uniformity of the traditional hydrogel network structure and the lack of energy loss mechanism lead to poor mechanical properties, which seriously affects the application prospects and prospects in related fields. develop. Therefore, how t...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08J3/24C08L1/28C08L1/16C08L1/08C08L83/06C08G77/20C08G77/14
CPCC08J3/075C08J3/246C08G77/20C08G77/14C08J2301/28C08J2301/16C08J2301/08C08J2483/06C08J2383/06C08J2401/28C08J2401/16C08J2401/08
Inventor 厉世能何潇枫吕志建吴强姜柏羽李倩
Owner ZHEJIANG FORESTRY UNIVERSITY
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