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Linear block copolymer, dendritic nano-silver composite material and preparation method thereof

A block copolymer, linear technology, applied in the field of dendritic nano-silver composite materials, to achieve the effects of large specific surface area, strong anti-interference, and good electrocatalytic activity

Active Publication Date: 2018-11-13
中山安康德美生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The performance of existing nano-silver composite materials still needs to be improved, so it is necessary to develop a new type of nano-silver composite material

Method used

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  • Linear block copolymer, dendritic nano-silver composite material and preparation method thereof
  • Linear block copolymer, dendritic nano-silver composite material and preparation method thereof
  • Linear block copolymer, dendritic nano-silver composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Synthesis of Chain Transfer Agents

[0061]

[0062] Synthesize the chain transfer agent according to the above reaction formula, these reactions are known routine reactions, can be carried out according to the usual reaction conditions, no longer repeat them.

[0063] chain transfer agent 1 H NMR spectrum such as figure 1 as shown, 13 C NMR spectrum as figure 2 As shown, the MS spectrum is as image 3 As shown, the FT-IR spectrum is as Figure 4 As shown, these characterization data can prove that the chain transfer agent was synthesized.

Embodiment 2

[0065] Synthesis of Linear Block Copolymers

[0066] 1. Add 0.04g of chain transfer agent compound 1 into a 100mL three-neck flask, vacuumize for 15min in an ice-water bath, then pass nitrogen for 15min, repeat 3 times, and rise to room temperature. g methyl methacrylate and 1 g monomer hydroxyethyl methacrylate were reacted at a constant temperature of 65° C. for 3 h, and the reaction was terminated by liquid nitrogen. Use chloroform as a precipitating agent to separate, then dissolve in ethanol, repeat the dissolution-precipitation operation 3 times to achieve purification, and obtain polymer 2.

[0067] 2. Add 0.15g of polymer 2 into the reaction bottle, add 0.8g of initiator AIBN and 1g of N-vinylpyrrolidone under the protection of nitrogen, react at a constant temperature of 70°C for 4 hours, and stop the reaction with liquid nitrogen. Use acetone as a precipitating agent to separate, then dissolve with ethanol, repeat the dissolution-precipitation operation 3 times to a...

Embodiment 3

[0073] Self-assembly of dendritic nanosilver composites

[0074] 1. The linear block copolymer obtained in Example 2 is made into a 2wt% aqueous solution, and the block copolymer can self-assemble into nanomicelles in an aqueous solution, wherein the relative lipophilic segments containing a certain amount of hydroxyl groups constitute the micelles. The inner core, the hydrophilic chain segment constitutes the outer shell of the micelles, this structure provides a "nano device" for the follow-up;

[0075] 2. Add silver nitrate to the aqueous solution, mix well, add reducing agent at room temperature, stir for 6 minutes, the solution gradually changes from colorless to light brown; the amount of silver nitrate is 2% of the mass of the linear block copolymer, silver nitrate and The molar ratio of reducing agent is 1: 1.4, and reducing agent is hydrazine;

[0076] 3. Put into a dialysis bag after standing still for 24 hours, dialyze with ethanol and deionized water for 5 days su...

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Abstract

The invention belongs to the field of nano composites and discloses a linear block copolymer. The structure of the linear block copolymer is shown in the specification, wherein x is larger than or equal to 20 and smaller than or equal to 30, y is larger than or equal to 30 and smaller than or equal to 70, and R is CH3 or CH2CH2OH. The invention further discloses a preparation method of the linear block copolymer, and a dendritic nano-silver composite obtained through self-assembly of the linear block copolymer. The dendritic nano-silver composite has the large specific area and high electrocatalytic activity and has good reduction catalysis capacity to H2O2 and other unstable substances, and therefore the dendritic nano-silver composite can be used as a sensor for detection and analysis of relevant substances.

Description

technical field [0001] The invention belongs to the field of nano-composite materials, in particular to a dendritic nano-silver composite material prepared by utilizing a linear block copolymer. Background technique [0002] Nanocomposites usually use polymers (such as resins, rubbers, fibers, etc.), ceramics, and metals as the continuous phase, and nano-sized metals (nano-gold, nano-silver, etc.), semiconductors, rigid particles or other inorganic particles, Modifiers such as fibers and carbon nanotubes are dispersed phases, and the modifiers are uniformly dispersed in the matrix material through appropriate preparation methods to form a composite system in which at least one phase exists in nanometer size. [0003] Among them, due to the unique small size effect, surface effect, quantum size effect and macroscopic quantum tunneling effect of metal nanoparticles, the nano-metal composite material has excellent performance in terms of light, electricity, magnetism, corrosion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F293/00C08F226/10C08F8/04C08F2/38B22F9/24B01J31/06
CPCB01J31/064B22F9/24C08F2/38C08F8/04C08F226/10C08F293/005C08F2438/03
Inventor 刘意卢锡洪姜久兴吴功庆
Owner 中山安康德美生物科技有限公司
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