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Soap-free emulsion polymerization method based on temperature responsive monomer

A temperature-responsive, soap-free emulsion technology, applied in the field of soap-free emulsion polymerization, achieves the effects of simple process, mild polymerization conditions and high molecular weight of the prepared polymer

Inactive Publication Date: 2016-11-09
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of temperature-responsive monomers to form aggregates above the LCST to further initiate polymerization to achieve soap-free emulsion polymerization has never been reported.

Method used

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  • Soap-free emulsion polymerization method based on temperature responsive monomer
  • Soap-free emulsion polymerization method based on temperature responsive monomer
  • Soap-free emulsion polymerization method based on temperature responsive monomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: The specific steps are as follows: put 0.5 g of temperature-responsive monomer MeG1 into a reaction tube, add 2.5 mg of 4,4'-azo(4-cyanovaleric acid) (AVCA) as a water-soluble free radical initiator, Then add 5 mL of distilled water. Add magnetic sub-stirring at normal temperature to make the mixture uniform, then seal the reaction tube, replace nitrogen, and then place the reaction tube at 65 o In the C oil bath, the system changed from clarification to milky white and reacted for 6 hours. Yield 82%. The polymer molecular weight (Mn) was 1,300,000. The product became a viscous oil.

Embodiment 2

[0023] Embodiment two: concrete steps are as follows:

[0024] Take 0.2 g of temperature-responsive monomer EtG1 into the reaction tube, add 1 mg of 4,4'-azo(4-cyanovaleric acid) (AVCA) as a water-soluble free radical initiator, and then add 2 mL of distilled water. Add magnetic sub-stirring at normal temperature to make the mixture uniform, then seal the reaction tube, replace nitrogen, and then place the reaction tube at 65 o In the C oil bath, the system changed from clarification to milky white and reacted for 4 hours. Yield 75%. The polymer molecular weight (Mn) was 2,200,000. The product became a viscous oil.

Embodiment 3

[0025] Embodiment three: concrete steps are as follows:

[0026] Take 0.5 g of temperature-responsive monomer EtG1 and 0.5 g of non-temperature-responsive styrene, add 2.5 mg of 4,4'-azo(4-cyanovaleric acid) (AVCA) as a water-soluble free radical initiator, and then add Distilled water 10 mL. Add magnetic sub-stirring at normal temperature to make the mixture uniform, then seal the reaction tube, replace nitrogen, and then place the reaction tube at 65 o In the C oil bath, the system changed from clarification to milky white and reacted for 4 hours. The product is in the form of a viscous emulsion.

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Abstract

The invention provides a soap-free emulsion polymerization method based on a temperature responsive monomer. The method takes a temperature responsive monomer aqueous solution, when a system temperature rises above the lowest critical solution temperature, the monomer is subjected to dehydration phase change, an aggregate is produced in water, the monomer local concentration is increased, and the aggregate is similar to a micelle; in the presence of a water soluble initiator, the monomer is subjected to a polymerization reaction. Under a condition without addition of an emulsifier, the emulsion is formed only by increasing the temperature, soap-free emulsion polymerization is achieved, and emulsion copolymerization with a non-temperature-responsive monomer can be achieved. The method has the advantages that the influence of the emulsifier on the performance of the product can be avoided, and the complex process of removing the emulsifier is also omitted.

Description

technical field [0001] The invention relates to a soap-free emulsion polymerization method based on a temperature-responsive monomer. Background technique [0002] Due to the introduction of emulsifiers, the products obtained by emulsion polymerization have the defects caused by residual emulsifiers. If drying needs to break the emulsifier, the process is difficult to control. Soap-free emulsion polymerization refers to emulsion polymerization in which no emulsifier is added or only a small amount of emulsifier is added. Soap-free emulsion polymerization can avoid the influence of emulsifier on product performance, and avoid the complicated process of removing emulsifier. [0003] Temperature-induced phase transition behavior is widely used in the field of controlled release of drugs. Such substances usually have a lower critical solution temperature (LCST). Below the LCST, they are in a well-dissolved state in water. When the temperature is above, its hydrophobicity is gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/30C08F220/30C08F212/08C08F220/14C08F2/22
CPCC08F2/22C08F4/04C08F120/30C08F212/08C08F220/14C08F220/30C08F220/305
Inventor 张阿方张夏聪李文刘洁董庆豪
Owner SHANGHAI UNIV
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