Polyhydroxyl tri-hydrazide initiator and preparation method thereof

A polyhydroxy ternary hydrazide and initiator technology, which is applied in the preparation of hydrazides and organic chemistry, can solve the problems of limited chemical design, and achieve the effects of low energy consumption, pure products, and mild and controllable reaction conditions

Active Publication Date: 2019-07-05
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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  • Polyhydroxyl tri-hydrazide initiator and preparation method thereof
  • Polyhydroxyl tri-hydrazide initiator and preparation method thereof
  • Polyhydroxyl tri-hydrazide initiator and preparation method thereof

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Embodiment Construction

[0017] Below in conjunction with embodiment the present invention is described in further detail.

[0018] The preparation of polyhydroxyl ternary hydrazide initiator:

[0019] 1. Mix and dissolve trimethylolpropane triglycidyl ether and benzohydrazide in absolute ethanol at a molar ratio of 1:3, and control the mass ratio of trimethylolpropane triglycidyl ether to ethanol at 1: 3.5 to 1:4 range, keep the reaction solution under reflux for 3 to 4 hours under stirring;

[0020] 2. Transfer the above reaction solution into a high-pressure reactor, and add ethylene oxide, the molar ratio of ethylene oxide to benzohydrazide is controlled at 1.2:1, and the reaction temperature is controlled at 45-50°C after closing the reactor range, the reaction time is 3 to 4 hours, and then the reactor is cooled to room temperature;

[0021] 3. Concentrate the solution in the reaction kettle with a rotary evaporator to remove ethanol, and finally obtain a light yellow viscous substance, which ...

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Abstract

The invention provides a polyhydroxyl tri-hydrazide initiator and a preparation and application method thereof. The initiator is an amphiphilic compound containing three hydrazide groups. The compoundcan be positioned in an oil-water interface. The hydrazide of the hydrophilic part can carry out redox reactions with potassium persulfate at a room temperature. The free radicals can be generated repeatedly for multiple times. A multi-phase serial polymerization mode can be flexibly controlled. In an oil-water interface, polymerization between styrene and vinyl acetate and polymerization betweenstyrene and N-vinyl pyrrolidone are triggered in sequence to obtain a segmented copolymer. The results of tests show that the feed ratio and the constituent ratio of the copolymer are almost identical, this means that the triggering efficiency of the initiator is high, moreover, the conditions of the polymerization reactions of this mode are controllable, the energy consumption is low, no other organic solvent or emulsifier is needed, the product is pure, and the preparation method meets the requirements of green chemistry.

Description

technical field [0001] The invention relates to the technical field of polymer material synthesis, in particular to a polyhydroxy ternary hydrazide initiator and a preparation and use method thereof. The novel initiator can be used for the green synthesis of various polyolefin polymer materials. Background technique [0002] Polyolefins are a very important class of polymer materials with a wide variety of applications. Such materials are generally obtained by homopolymerizing or copolymerizing olefin monomers through initiators. According to different polymerization occasions, free radical initiators can be divided into two categories: oil-soluble and water-soluble, which are used for oil-soluble and water-soluble monomers respectively. For the polymerization of monomers, water-soluble initiators can also initiate the polymerization of oil-soluble monomers by diffusing into tiny emulsion micelles. In the existing polymer polymerization technology, the free radical initiato...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C243/38C07C241/04C08F4/40C08F293/00C08F212/08C08F218/08C08F226/10
CPCC07C241/04C08F4/40C08F293/00C08F212/08C08F218/08C08F226/10C07C243/38
Inventor 吴嘉沁张瑞丰李艳肖通虎龙能兵
Owner NINGBO UNIV
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