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Method for preparing water-soluble graft polymers based on active/controllable radical polymerization

A technology of water-soluble polymers and graft polymers, which is applied in the field of preparation of water-soluble graft polymers based on living/controllable radical polymerization, which can solve the problem of limiting the application of living/controllable free radical polymerization and the decline of control effects, etc. question

Active Publication Date: 2016-06-01
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Study on living / controlled free radical polymerization of water-soluble monomers such as (meth)acrylamide-based monomers, (meth)acrylic acid, (meth)acrylates, N-vinylpyrrolidone, etc., compared to other monomers and compared with the organic phase reaction system, the control effect of the commonly used living / controllable radical polymerization method on the water-soluble monomer polymerization in the water phase reaction system has declined to varying degrees, and the transition metal ( ATRP polymerization system), RAFT reagents, etc. have a great influence on the properties of the prepared polymer, thus limiting the application of living / controlled free radical polymerization in the field of water-soluble polymer preparation

Method used

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  • Method for preparing water-soluble graft polymers based on active/controllable radical polymerization
  • Method for preparing water-soluble graft polymers based on active/controllable radical polymerization
  • Method for preparing water-soluble graft polymers based on active/controllable radical polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Example 1: PVP is a water-soluble polymer containing a hydrogen donor group, and BP is a hydrogen abstraction type photoinitiator, preparing a water-soluble multifunctional macromolecular initiator containing a dormant group in the side group

[0079] In a 200mL quartz photoreactor, add a 10wt% PVP aqueous solution prepared by dissolving 5.0g PVPK30 in 50mL water, and dissolve 1.25gBP in 50mL ethanol to prepare a 2.5wt% BP solution. Mix the system uniformly and pass nitrogen gas for 30 minutes to remove oxygen. , and then the mixed solution was irradiated under a UV light source, and the light intensity was set to 6000 μW / cm 2 ; The irradiation time was set to 30 minutes. After the reaction, the polymer solution was precipitated with 100mL ethanol, and the water-soluble polyfunctionality macromolecular initiator was precipitated and separated from the system. The prepared macromolecular initiator was washed three times with 50mL ethanol, and washed twice with 50mL aceto...

Embodiment 2

[0080] Example 2: PAA is a water-soluble polymer containing a hydrogen donor group, xanthone (XT) is a hydrogen abstraction type photoinitiator, and the preparation of a water-soluble multifunctional macromolecular initiator containing a dormant group in the side group agent

[0081] In a 200mL quartz photoreactor, add 5.0gPAA dissolved in 50mL water to prepare a 10wt% PAA aqueous solution, 2.50gXT dissolved in 50mL tetrahydrofuran to prepare a 5.0wt% XT solution, and mix the system uniformly with nitrogen for 30 minutes to remove oxygen , and then the mixed solution was irradiated under a UV light source, and the light intensity was set to 8000 μW / cm 2 ; The irradiation time was set to 40 minutes. After the reaction, the polymer solution was precipitated with 100mL ethanol, and the water-soluble polyfunctional macromolecular initiator was precipitated and separated from the system. The prepared macromolecular initiator was washed three times with 50mL ethanol, and then washe...

Embodiment 3

[0082] Example 3: PAM is a water-soluble polymer containing hydrogen donor groups, isopropylthioxanthone (ITX) is a hydrogen abstraction type photoinitiator, and the water-soluble polyfunctional polymer containing dormant groups in the preparation side chain macroinitiator

[0083] In a 200mL quartz photoreactor, add 5.0gPAM dissolved in 50mL water to prepare a 10wt% PAM aqueous solution, 2.50gITX dissolved in 50mL tetrahydrofuran to prepare a 5.0wt% ITX solution, and mix the system uniformly with nitrogen for 30 minutes to remove oxygen , and then the mixed solution was irradiated under a UV light source, and the light intensity was set to 8000 μW / cm 2 ; The irradiation time was set to 30 minutes. After the reaction, the polymer solution was precipitated with 100mL ethanol, and the water-soluble polyfunctional macromolecular initiator was precipitated and separated from the system. The prepared macromolecular initiator was washed three times with 50mL ethanol, and then washe...

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Abstract

The invention discloses a method for preparing water-soluble graft polymers through active / controllable radical polymerization. The method can be used for controllable radical polymerization of various water-soluble monomers of a (methyl) acrylamide monomer, (methyl) acrylic acid, (methyl) acrylate and the like, so as to prepare the water-soluble graft polymers with different molecular weights. The preparation method is particularly realized through the following steps: firstly, preparing a water-soluble polyfunctional macroinitiator by adopting a chemical modification manner; secondly, initiating active / controllable radical polymerization of the water-soluble monomers by the macroinitiator under the heating or visible light / ultraviolet light irradiation condition, and preparing the molecular weight and chemical constitution controllable water-soluble graft polymers. The method is simple in synthetic route, low in production cost and safe and convenient to operate; the prepared macroinitiator is high in dissolution rate in water phase and high in initiating activity, and can be used for preparing the chemical constitution and molecular weight controllable water-soluble graft polymers.

Description

technical field [0001] The present invention relates to a new method for the preparation of water-soluble graft polymers by living / controlled free radical polymerization of water-soluble monomers, which can be used for (meth)acrylamide monomers, (meth)acrylic acid, (meth) Controlled / living radical polymerization of various water-soluble monomers such as acrylate) to prepare water-soluble graft polymers with controllable molecular weight. Background technique [0002] Free radical polymerization is the most widely used chemical reaction in the polymer synthesis industry. It has the advantages of wide range of monomer selection, mild reaction conditions, simple operation, and suspension and emulsion polymerization with water as the medium. However, traditional free radical polymerization also has many shortcomings, such as the uncontrollable molecular weight of the prepared polymer product, and the difficulty in designing and controlling the molecular structure of the polymer ...

Claims

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Application Information

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IPC IPC(8): C08F285/00C08F265/02C08F283/06C08F271/02C08F220/06C08F220/56C08F265/10C08F265/04C08F2/48
CPCC08F2/48C08F265/02C08F265/04C08F265/10C08F271/02C08F283/06C08F285/00C08F220/56C08F220/06
Inventor 杨万泰陈冬王力马育红赵长稳
Owner BEIJING UNIV OF CHEM TECH
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