Preparation method of polymethyl methacrylate with narrow molecular weight distribution

A technology of polymethyl methacrylate and methyl methacrylate, which is applied in the field of polymer material preparation, can solve the problems of complex preparation process, harsh polymerization conditions, and long polymerization cycle, and achieve high monomer conversion rate and high reaction rate Fast and simple preparation method

Inactive Publication Date: 2015-04-08
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the existing problems such as complex preparation process of narrow molecular weight distribution polymerization, harsh polymerization conditions, expensive and

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0013] The present invention provides a method for preparing polymethyl methacrylate with narrow molecular weight distribution, which adopts solution polymerization, and the steps and conditions are as follows:

[0014] Put methyl methacrylate, solvent and initiator into the reaction vessel, stir well until the mixture is uniform, evacuate the air in the reaction vessel with nitrogen, and react at 90-180°C for 60-180 minutes, preferably at 100- React at 130°C for 120-150 minutes, and separate the polymer by sedimentation, preferably at room temperature for 12-20 hours, and then dry under vacuum to obtain polymethyl methacrylate with narrow molecular weight distribution. The sedimentation method of the present invention is a commonly used technical method in the field, and there is no special limitation.

[0015] According to the present invention, dialkylimidazole ionic liquids are used as solvents. Because ionic liquids are a kind of special solvents with relatively high viscosity...

Example Embodiment

[0026] Example 1

[0027] Take 50 parts of the monomer methyl methacrylate, 50 parts of the solvent 1-methyl-3-butylimidazole hexafluorophosphate, and 0.05 parts of the initiator di-tert-butyl peroxide into the reactor, fully stir until the mixture is uniform, The air in the reactor was evacuated with nitrogen, sealed and reacted at 90°C for 150 minutes. After the reaction, the polymer was precipitated by sedimentation, placed at room temperature for 12 hours, and then dried at 60°C for 48 hours under vacuum to obtain Molecular weight distribution polymethyl methacrylate.

[0028] The number average molecular weight of the polymethyl methacrylate obtained in Example 1 is 907850, and the molecular weight distribution: PDI=1.3.

Example Embodiment

[0029] Example 2

[0030] Take 30 parts of the monomer methyl methacrylate, 70 parts of the solvent 1-methyl-3-ethylimidazole tetrafluoroborate, and 0.5 part of the initiator di-tert-butyl peroxide into the reactor, and fully stir until the mixture is uniform , The air in the reactor was evacuated with nitrogen, sealed and reacted at 100°C for 180 minutes, after the reaction, the polymer was precipitated by sedimentation, placed at room temperature for 12 hours, and then dried at 60°C under vacuum for 48 hours to obtain Narrow molecular weight distribution polymethyl methacrylate.

[0031] The number average molecular weight of the polymethyl methacrylate obtained in Example 2 was 709158, and the molecular weight distribution: PDI=1.27.

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PUM

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Abstract

The invention provides a preparation method of polymethyl methacrylate with narrow molecular weight distribution, and belongs to the field of preparation methods of high polymer material. The problems that the existing preparation method of polymethyl methacrylate with narrow molecular weight distribution is complex in process, rigor in polymerization condition and long in polymerization period are overcome. The method includes that: methyl methacrylate, solvent and initiator are put into a reaction vessel for reacting for 60-180min at the temperature of 90DEG C-180 DEG C, and thereby the polymethyl methacrylate with narrow molecular weight distribution is obtained; the solvent is dialkyl imidazole ionic liquid. According to the preparation method, the dialkyl imidazole ionic liquid is used as the solvent, so that the polymethyl methacrylate with narrow molecular weight distribution is obtained by high temperature polymerization; furthermore, the preparation method is simple and quick in reaction speed; the materials can be directly used without pretreatment, and the molecular weight distribution index of the prepared polymethyl methacrylate is 1.0-1.3.

Description

technical field [0001] The invention belongs to the field of preparation methods of polymer materials, and in particular relates to a preparation method of polymethyl methacrylate with narrow molecular weight distribution. Background technique [0002] Molecular weight distribution is an important characteristic parameter of polymerization, which determines the fluidity and mechanical properties of polymer materials. The narrower the molecular weight distribution, the better the mechanical properties of the polymer. Anionic polymerization, atom transfer radical polymerization, nitroxide regulated polymerization, reversible addition-fragmentation chain transfer polymerization and electron transfer radical polymerization are the common methods to prepare polymers with narrow molecular weight distribution. Polymers having a molecular weight distribution index of 1.0 to 1.5 can be synthesized by these methods. Although the PMMA resin of narrow molecular weight distribution can...

Claims

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Application Information

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IPC IPC(8): C08F120/14C08F2/06
CPCY02P20/54
Inventor 曹春雷于涛谭志勇张会轩
Owner CHANGCHUN UNIV OF TECH
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