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Application of MXene as free radical initiator

An initiator, free radical technology, applied in the field of MXene and free radical polymerization, can solve the problems of long processing time and low efficiency, and achieve the effect of excellent photothermal effect

Inactive Publication Date: 2019-09-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the preparation methods of MXene materials are generally based on HF, LiF / HCl, NaHF 2 、KHF 2 or NH 4 HF 2 As an etchant, etch first, then strip {AdvancedMaterials 2018, 30(52), 1804779}, the processing time is longer and the efficiency is lower
So far, there is no research report on the direct use of two-dimensional MXene materials as free radical initiators to initiate the polymerization of olefinic monomers and synthesize polymer hydrogels without light conditions.

Method used

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  • Application of MXene as free radical initiator
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  • Application of MXene as free radical initiator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1. Preparation of Ti by Ultrasonic Assisted Simultaneous Etching and Stripping Process 3 C 2 、Ti 2 C. Nb 2 C two-dimensional nanomaterials

[0042] Ti 3 C 2 Preparation of:

[0043] 0.125g Ti 3 AlC 2 Uniformly dispersed in 0.2g LiF / 2.5mL HCl (9M) solution, after 300W ultrasonic reaction for 6h, washed repeatedly with deionized water until the pH was about 5-6; then, centrifuged at 12000rpm for 10min to take the supernatant to obtain Ti 3 C 2 Nanosheets.

[0044] Ti 2 Preparation of C:

[0045] 0.09g Ti 2AlC is uniformly dispersed in 0.13g LiF / 2.5mL HCl (3M) solution, and after 300W ultrasonic reaction for 6h, it is washed repeatedly with deionized water until the pH is about 5-6; then it is centrifuged at 12000rpm for 10min to take the supernatant to obtain Ti 2 C nanosheets.

[0046] Nb 2 Preparation of C:

[0047] 0.144g Nb 2 AlC was evenly dispersed in 0.23g LiF / 3mL HCl (9M) solution, and after 300W ultrasonic reaction for 6h, it was repeated...

Embodiment 2

[0048] Embodiment 2. Different MXene materials (prepared in Example 1) initiate acrylamide polymerization

[0049] Take 80mg of acrylamide monomer and dissolve it in 1mL MXene (1.6wt%) nanosheets, and pass N under ice-cooling 2 After deoxygenation for 2 minutes, polymer hydrogel can be formed after reacting in the dark at 4°C for 10 minutes. The gel images obtained by polymerization of different MXenes are shown in figure 1 As shown, the gel sample does not flow after being inverted, indicating that different MXene materials can initiate monomer polymerization and further obtain gel.

[0050] The MXene material of the present invention proves that the MXene system produces hydroxyl radicals by electron paramagnetic resonance spectrum (EPR), which can initiate monomer polymerization, as follows:

[0051] Dissolve 5 mg of 5,5-dimethyl-1-pyrroline oxide (DMPO) in 200 μL Ti 3 C 2 in, through Ti 3 C 2 Electron Paramagnetic Resonance Spectroscopy Bruker A300 spectrometer for f...

Embodiment 3

[0052] Example 3.Ti 3 C 2 Nanosheet (prepared in Example 1) initiates polymerization of different monomers

[0053] Take 80mg of N-isopropylacrylamide (NIPAM), N,N-dimethylacrylamide (DMA), acrylamide (AAm), dimethylaminoethyl methacrylate (DMAEMA), acrylic acid (AAc) and Hydroxyethyl methacrylate (HEMA) monomer was dissolved in 1 mL Ti 3 C 2 (1.6wt%) in the nanosheets, the N 2 After deoxygenation for 2 minutes, polymer hydrogels can be formed after 10 minutes of polymerization in the dark at 4°C. The polymer diagrams of different monomers are shown in image 3 As shown, Ti 3 C 2 Nanosheets can initiate polymerization of different monomers.

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Abstract

The invention particularly discloses an application of MXene as an initiator. MXene is used as an initiator to initiate polymerization of the olefin monomer under the deoxygenation condition. The MXene is obtained through the following steps that MAX is treated in etching liquid, synchronous etching stripping is carried out under the assistance of ultrasonic waves, and then the material is washed. The invention innovatively provides the following facts: the MXene prepared by the ultrasonic-assisted synchronous etching stripping method unexpectedly has a good initiation effect, and can initiate polymerization of olefin monomers without conventional initiation conditions (such as no conventional light initiation or no common free radical initiator initiation).

Description

technical field [0001] The invention relates to the fields of MXene and free radical polymerization, and in particular to a preparation method of MXene and the application of MXene as a free radical initiator. Background technique [0002] Free radical polymerization occupies an extremely important position in polymer science and industry. The polymerization reaction is a chain polymerization reaction, which mainly includes four elementary reactions of chain initiation, chain growth, chain termination and chain transfer. [0003] Two-dimensional MXene sheets are a new type of layered nanomaterials, which have a two-dimensional structure similar to graphene, metal conductivity, and excellent electrochemical properties. They are used in energy storage, catalysis, biomedical, sensors, and new polymer enhancements It shows good application prospects in many fields such as matrix composite materials {Journal of Inorganic Materials 2017, 32(06), 561-570}. [0004] At present, the...

Claims

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Application Information

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IPC IPC(8): C08F4/16C08F120/56C08F120/54C08F120/34C08F120/06C08F120/20
CPCC08F4/16C08F120/06C08F120/20C08F120/34C08F120/54C08F120/56
Inventor 李娟张德盘陶娜李锡龙孙晓毅刘又年
Owner CENT SOUTH UNIV
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