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Vinyl acetate RAFT solution polymerization method

A technology of vinyl acetate and polymerization method, applied in the field of chemistry, can solve problems such as less polymerization reports, and achieve the effects of good popularization value, short reaction period and mild reaction conditions

Inactive Publication Date: 2014-05-21
李征
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on RAFT polymerization mainly focuses on emulsion, microemulsion, bulk polymerization, etc., and there are few reports on RAFT solution polymerization of PVAc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Dissolve 2.8255 g of KOH in 20 mL of ethanol until a clear solution is formed, then slowly add CS dropwise 2 10 mL. After 5 hours of reaction, 4.6 mL of methyl bromoacetate was added, and the reaction was continued for 12 hours. Then, the precipitate was filtered, the solvent was rotary evaporated, and the crude product was separated by column with petroleum ether. A yellow liquid product is obtained.

Embodiment 2

[0014] Dissolve 3.6265 g of KOH in 25 mL of ethanol until a clear solution is formed, then slowly add CS dropwise 2 25mL. After 21 hours of reaction, 6 mL of methyl bromoacetate was added, and the reaction was continued for 47 hours. Then, the precipitate was filtered, the solvent was rotary evaporated, and the crude product was separated by column with petroleum ether. A yellow liquid product is obtained.

Embodiment 3

[0016] Dissolve 3.5 g of KOH in 33 mL of ethanol until a clear solution is formed, then slowly add CS dropwise 2 52 mL. After 16 hours of reaction, 8 mL of methyl bromoacetate was added, and the reaction was continued for 24 hours. Then, the precipitate was filtered, the solvent was rotary evaporated, and the crude product was separated by column with petroleum ether. A yellow liquid product is obtained.

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PUM

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Abstract

The invention discloses a vinyl acetate RAFT solution polymerization method, belongs to the field of chemical technology, and more specifically, relates to the improvement of the vinyl acetate RAFT solution polymerization method. The invention provides the vinyl acetate RAFT solution polymerization method comprising that the molecular weight distribution is controlled below 1.8 by addition of MESA and influences of the MESA concentration, the temperature and the time on a polymerization reaction are discussed. The vinyl acetate RAFT solution polymerization method comprises the steps: dissolving KOH in ethanol until a transparent solution is formed, and slowly dropwise adding CS2; after a reaction is carried out, adding methyl bromoacetate, and continuing to carry out a reaction; and then, filtering out a precipitate, carrying out rotary evaporation of the solvent, and carrying out column chromatography separation of a crude product with petroleum ether, and thus obtaining a yellow liquid product.

Description

technical field [0001] The invention belongs to the technical field of chemistry, and more specifically, the invention relates to the improvement of the RAFT solution polymerization method of vinyl acetate. Background technique [0002] Since the 1990s, great progress has been made in the research of living radical polymerization. The current research mainly focuses on polymerization in the presence of nitrogen and oxygen (NMP), atom transfer radical polymerization (ATRP), reversible addition-fragmentation chain transfer polymerization, etc. method. The raw material VAc of polymerized vinyl alcohol (PVA) has a high tendency to transfer to the solvent and polymer chain and to terminate the double-radical coupling, and there are two problems of branching and wide molecular weight distribution. However, the molecular structure of VAc determines that only free radical polymerization can be used. [0003] recent years. In the report of PVAc living free radical polymerization, ...

Claims

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Application Information

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IPC IPC(8): C08F18/08C08F2/38C08G61/12
Inventor 李征
Owner 李征
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