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Method for synthesizing branched polymer by using vinyl benzyl sulfydryl propionate as a functional monomer

A technology of vinylbenzyl mercaptopropionate and branched polymers, which is applied in the field of branched polymers prepared from styrene monomers, and can solve the problems of extremely unstable storage of monomers, poor stability of polymers, and low branching efficiency. problems, to achieve the effect of simple and easy operation, mild polymerization reaction conditions and low cost

Inactive Publication Date: 2011-06-29
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, some researchers have designed the branched monomer itself to contain chemical weak bond structure, resulting in the existence of a large number of weak bonds on the polymer backbone, which ultimately leads to poor stability of the polymer.
There are also chain transfer monomers designed by researchers, although they do not contain chemical weak bonds, but the monomer storage is extremely unstable and easily oxidized
Some scholars have designed recessive branched monomers, which do not contain chain transfer groups. During the polymerization process, appropriate reagents need to be added to make the recessive branched monomers generate chain transfer groups in situ, and then Synthesis of branched polymers, but with low branching efficiency

Method used

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  • Method for synthesizing branched polymer by using vinyl benzyl sulfydryl propionate as a functional monomer
  • Method for synthesizing branched polymer by using vinyl benzyl sulfydryl propionate as a functional monomer
  • Method for synthesizing branched polymer by using vinyl benzyl sulfydryl propionate as a functional monomer

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Experimental program
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Effect test

Embodiment 1

[0018] Vinylbenzyl mercaptopropionate (0.0215g, 0.1mmol), styrene (10.4067g, 0.1mol), initiator AIBN (0.0823g, 0.5mmol) and solvent toluene (5.2051g) were added to the flask, and the flask Put it into an oil bath at 60° C. and react for 45 hours, and the conversion rate of styrene is measured to be 91.50%. The polymer was analyzed by three-detection gel permeation chromatography, and the results were as follows: light scattering weight average molecular weight M w.MALLS =606900, molecular weight distribution PDI=4.81, Mark-Houwink index α=0.585, branching factor g '=0.47, confirming that the obtained polymer has a branched structure.

Embodiment 2

[0020] Vinylbenzyl mercaptopropionate (0.0227g, 0.1mmol), styrene (10.4096g, 0.1mol), initiator AIBN (0.0818g, 0.5mmol) and solvent toluene (5.2096g) were added to the flask, and the flask Put it into an oil bath at 70° C. for 44 hours to react, and the measured conversion rate of styrene reaches 97.40%. The polymer was analyzed by three-detection gel permeation chromatography, and the results were as follows: light scattering weight average molecular weight M w.MALLS =235700, molecular weight distribution PDI=3.74, Mark-Houwink index α=0.546, branching factor g ' = 0.62, confirming that the obtained polymer has a branched structure.

Embodiment 3

[0022] Vinyl benzyl mercaptopropionate (0.0231 g, 0.1 mmol), styrene (10.4102 g, 0.1 mol), initiator AIBN (0.0825 g, 0.5 mmol) and solvent toluene (5.2170 g) were added to the flask, and the flask Put it into an 80° C. oil bath and react for 18 hours, and the measured conversion rate of styrene reaches 92.10%. The polymer was analyzed by three-detection gel permeation chromatography, and the results were as follows: light scattering weight average molecular weight M w.MALLS =233900, molecular weight distribution PDI=4.07, Mark-Houwink index α=0.517, branching factor g '=0.65, confirming that the obtained polymer has a branched structure.

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Abstract

The invention belongs to the field of macromoleclar polymerization and relates to a method for preparing a branched polymer by using a vinyl benzene monomer containing polymerizable double bonds and chain transfer sulfydryl. In the method, vinyl benzyl sulfydryl propionate serving as a functional monomer and a vinyl monomer such as vinyl benzene undergo polymerization at 60 to 135 DEG C in methylbenzene, benzene or dimethylbenzene serving as a solvent in the presence of azodiisobutyronitrile (AIBN) serving as an initiator to form the branched polymer successfully. The branch degree of the branched polymer can be regulated by regulating the molar ratio of the branched monomer and the polymer monomer, polymerization temperature and polymerization time. In the method, the vinyl benzyl sulfydryl propionate with high storage stability is used as the branched monomer to form the branched polymer under a conventional free radical polymerization condition successfully, the polymerization conditions are mild, the operation is simple and easy to implement, the monomer conversion rate is high, and the degree of branching of the polymer is controllable; and the method has high adaptability for synthesizing branched polymers by using various monomers.

Description

technical field [0001] The invention belongs to the field of macromolecule polymerization, and relates to a method for preparing branched polymers from styrene monomers containing polymerizable double bonds and chain transfer mercapto groups. Background technique [0002] The application prospect of branched polymers has attracted the research and attention of a large number of experts and scholars at home and abroad, among which a lot of work has been done in the synthesis of branched polymers. At present, the living polymerization method mainly used in the synthesis of branched polymers has relatively harsh reaction conditions, which makes the large-scale application of branched polymers expensive. Therefore, researchers try to use polymerizable chain transfer agents to carry out free radical polymerization to synthesize branched polymers to reduce production costs, and to carry out molecular design on functional monomers that can be polymerized into branched polymers. Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F212/14
Inventor 黄文艳蒋必彪
Owner CHANGZHOU UNIV
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