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A kind of radical dispersion polymerization method of surfactant solvent system

A surfactant, dispersion polymerization technology, applied in the implementation of the polymerization reaction method, the field of free radical dispersion polymerization, to achieve the effect of narrow molecular weight distribution and high controllability

Active Publication Date: 2021-07-16
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many adverse effects on free radical polymerization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 30 g of octadecylamine polyoxyethylene ether (average degree of polymerization: 5) oxide, 0.45 g of ammonium persulfate initiator, and 3 g of acrylonitrile were successively added into the polymerization reactor. Stirring was turned on, and the polymerization temperature was controlled to be 60°C. After 24 hours of polymerization, some polymers precipitated out. Add ethanol to terminate the polymerization, flocculate and precipitate the polymer, wash with ethanol several times, and dry the product in a vacuum oven at 50° to constant weight. The measured final conversion rate was 77%, and the viscosity-average molecular weight was 10.3×10 4 g / mol.

Embodiment 2

[0028] 30 g of stearylamine polyoxyethylene ether (average degree of polymerization: 5) oxide, 0.45 g of ammonium persulfate initiator, and 3 g of styrene were sequentially added into the polymerization reactor. Stirring was turned on, and the polymerization temperature was controlled to be 60°C. After 24 hours of polymerization, some polymers precipitated out. Add ethanol to terminate the polymerization, flocculate and precipitate the polymer, wash with ethanol several times, and dry the product in a vacuum oven at 50° to constant weight. The measured final conversion rate is 57%, and the viscosity-average molecular weight is 6.5×10 4g / mol.

Embodiment 3

[0030] 30 g of stearylamine polyoxyethylene ether (average degree of polymerization: 5) oxide, 0.45 g of azobisisobutyronitrile initiator, and 3 g of styrene were successively added into the polymerization reactor. The stirring was turned on, and the polymerization temperature was controlled to be 90°C. After 12 hours of polymerization, some polymers precipitated out. Add ethanol to terminate the polymerization, flocculate and precipitate the polymer, wash with ethanol several times, and dry the product in a vacuum oven at 50° to constant weight. The measured final conversion rate is 62%, and the viscosity-average molecular weight is 10.2×10 4 g / mol.

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Abstract

The invention discloses a free radical dispersion polymerization method of a surfactant solvent system. The surfactant is used as a solvent, an initial initiator and a monomer are dissolved in the surfactant, and the monomer is polymerized in the surfactant; The polymer with a low molecular weight can be dispersed in the surfactant, and as the molecular weight of the polymer increases in the later stage of polymerization, the polymer can be released from the surfactant to form a dispersed state, forming free radical dispersion polymerization. The molecular weight of the polymer can be adjusted by adjusting the polymer solubility of the surfactant. The invention avoids the use of conventional solvents or water, and the surfactant can be recycled to realize green polymerization.

Description

technical field [0001] The invention belongs to the technical field of polymerization reaction method implementation, especially relates to the field of free radical dispersion polymerization, in particular a free radical dispersion polymerization system formed by surfactant and initiator monomer, which provides a free radical dispersion polymerization system of surfactant solvent system. Based dispersion polymerization method. It is characterized by the dispersing effect of the surfactant on the polymer. The polymer gradually precipitates out from the solvent after reaching a certain molecular weight. Background technique [0002] Solution polymerization is a commonly used free radical polymerization method. Its advantages are that the heat of polymerization is easy to diffuse, and the temperature of polymerization reaction is easy to control; it can be directly finished in solution; the material after reaction is easy to transport; it can eliminate the phenomenon of autom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/44C08F112/08C08F120/14C08F136/08C08F136/06C08F2/06
CPCC08F2/06C08F112/08C08F120/14C08F120/44C08F136/06C08F136/08
Inventor 申凯华齐德榜鲍方健
Owner DALIAN UNIV OF TECH