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Method for realizing controllable free radical polymerization based on Finkelstein reaction

A free radical and reaction technology, applied in the field of controlled free radical polymerization based on Finkelstein reaction, can solve the problems of photosensitive organic iodine compounds, colored products, expensive initiators, etc., achieve low price, rapid reaction, and reduce reaction cost Effect

Inactive Publication Date: 2019-01-29
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these types of polymerization methods also have corresponding disadvantages: high reaction temperature is required for nitrogen-oxygen-stabilized radical polymerization; copper salts are required as catalysts for atom transfer radical polymerization; expensive initiators are required for reversible addition-fragmentation chain transfer polymerization , and its product has color
However, organoiodine compounds are light sensitive and should not be stored

Method used

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  • Method for realizing controllable free radical polymerization based on Finkelstein reaction
  • Method for realizing controllable free radical polymerization based on Finkelstein reaction
  • Method for realizing controllable free radical polymerization based on Finkelstein reaction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] First, 0.04 mmol of ethyl α-bromophenylacetate, 0.04 mmol of sodium iodide, 8 mmol of methyl methacrylate, azo compound V65 (R = CH 2 CH(CH 3 ) 2 ) 0.01mmol, and N-iodosuccinimide 0.001mmol were sequentially added to the reaction device. Under stirring, nitrogen gas was bubbled into the above solution for 10 min. Afterwards, place the reaction apparatus at 60 o C, react for a certain time, and take out part of the reaction solution every certain reaction time. The monomer conversion rate of the reaction solution was detected by proton nuclear magnetic resonance. The molecular mass and dispersion coefficient of the obtained polymer were detected by gel permeation chromatography. The reaction kinetics and corresponding results are shown in figure 1 .

Embodiment 2

[0044] Concrete experimental procedure is identical with embodiment 1, and reaction temperature is promoted to 70 o c. The reaction kinetics and corresponding results are shown in figure 2 .

Embodiment 3

[0046] The specific experimental procedure is the same as in Example 1, and the reaction monomer methyl methacrylate is replaced with benzyl methacrylate. The reaction kinetics and corresponding results are shown in image 3 .

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Abstract

The invention discloses a method for realizing controllable free radical polymerization based on a Finkelstein reaction. The Finkelstein reaction is a reaction that a bromohydrocarbon is converted toan iodohydrocarbon with sodium iodide in polymeric monomers. The method comprises the following steps: firstly mixing an organic bromide, sodium iodide and a catalyst N-iodosuccinimide, then adding reaction monomers into the mixture, and then adding a certain amount of an azo compound and performing even mixing, then introducing nitrogen or argon to remove the air in the reaction system, and thencarrying out a polymerization reaction at a certain temperature. In the polymerization reaction process, the conversion ratio of the monomers increases with the increase of the reaction time, and a linear growth relationship exists between the molecular weight of the obtained polymer and the conversion ratio of the monomers, the dispersion coefficient of the obtained polymer is between 1.2 and 1.5, so that the polymerization reaction is a new controllable free radical polymerization reaction.

Description

technical field [0001] The invention belongs to the field of polymer synthesis methods, and in particular relates to a method for realizing controllable radical polymerization based on Finkelstein reaction. Background technique [0002] With the improvement of living standards and the gradual development of science and technology, polymer materials have been widely used in various fields of people's lives, covering people's clothing, food, housing, transportation, various sectors of the national economy and cutting-edge technologies. The variety and output of a country's materials are one of the important symbols to directly measure its science and technology, economic development level and people's living standards. The polymer synthesis method is the basis for obtaining polymer materials, and a new polymerization method will provide thousands of new polymer materials. [0003] Currently, the polymerization of olefins is the most widely studied due to the wide range of app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/14C08F120/18C08F4/04C08F4/00
CPCC08F4/00C08F4/04C08F120/14C08F120/18
Inventor 肖龙强郭博庚卢振赵玉来侯琳熙
Owner FUZHOU UNIV
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