A kind of amphiphilic acetylhydrazine initiator and its preparation and use method

A technology of acetylhydrazine and initiator, which is applied in the field of polymer material synthesis, can solve problems such as limiting chemical design, and achieve the effects of low energy consumption, high initiation efficiency, and pure products

Active Publication Date: 2021-11-30
NINGBO UNIV
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Problems solved by technology

The difference is that the active species of free radical living polymerization is generally only produced in a specific place, which limits the chemical design

Method used

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  • A kind of amphiphilic acetylhydrazine initiator and its preparation and use method
  • A kind of amphiphilic acetylhydrazine initiator and its preparation and use method
  • A kind of amphiphilic acetylhydrazine initiator and its preparation and use method

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Embodiment Construction

[0020] Below in conjunction with embodiment the present invention is described in further detail.

[0021] Preparation of amphiphilic acetylhydrazine initiator:

[0022] 1. Dissolve glycidyl stearate and acetylhydrazide in equimolar amounts in absolute ethanol, control the mass ratio of glycidyl stearate to ethanol in the range of 1:4.5 to 1:5, and make it under stirring The reaction solution was refluxed for 2 to 3 hours, and cooled to room temperature after the reaction was completed;

[0023] 2. Add glycidol to the above reaction solution, the molar ratio of glycidol to acetylhydrazide is 1:1, control the temperature of the reaction solution in the range of 35-40°C under stirring, react for 3-4 hours and then cool to room temperature;

[0024] 3. Concentrate the above reaction solution with a rotary evaporator to remove ethanol, and finally obtain a white solid substance that is the amphiphilic acetylhydrazide initiator, which can be well dissolved in water.

[0025] The ...

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Abstract

The invention relates to an amphiphilic acetylhydrazine initiator and its preparation and use method. Synthesize a compound containing octadecyl chain and hydrazide, which has the characteristics of surfactants. At the same time, hydrazide can undergo redox reaction with potassium persulfate at room temperature, which can repeatedly generate free radicals and flexibly control multi-phase series. Direct polymerization, styrene and methyl methacrylate and styrene and hydroxyethyl acrylate are sequentially initiated on the water / oil interface to obtain multi-block copolymers. Experiments have proved that the ratio of monomer feed to copolymer composition It is very consistent, indicating that the initiator has a high initiation efficiency. The polymerization reaction conditions of this mode are mild and controllable, the energy consumption is low, no other organic solvents and emulsifiers are used, and the product is pure, which fully meets the requirements of green chemistry.

Description

technical field [0001] The invention relates to the technical field of polymer material synthesis, in particular to an amphiphilic acetylhydrazine initiator and a preparation and use method thereof. The novel initiator can be used for the green synthesis of polyolefin polymer materials. Background technique [0002] Polyolefin is a very important general-purpose polymer material with adjustable structure and wide application. These materials are generally obtained by homopolymerizing or copolymerizing olefin monomers through free radical initiators. According to different polymerization occasions, initiators can be divided into two categories: oil-soluble and water-soluble, corresponding to oil-soluble and water-soluble monomers respectively. polymerization. Ordinary initiators are only a class of compounds that can generate free radicals, such as oil-soluble peroxides, azo initiators, and water-soluble persulfates. The use of initiators must be matched with the specific po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F4/00C08F4/40C08F293/00C07C241/04C07C243/28
Inventor 吴嘉沁张瑞丰李艳肖通虎龙能兵
Owner NINGBO UNIV
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