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A kind of preparation method of polymethyl methacrylate with high molecular weight and narrow distribution

A technology of polymethyl methacrylate and high molecular weight, which is applied in the field of preparation of polymethyl methacrylate with high molecular weight and narrow distribution, and can solve the problems of complex synthesis of RAFT reagents, no industrialized products, and expensive RAFT reagents. , to achieve the effect of high molecular weight upper limit, narrow distribution and low cost

Active Publication Date: 2020-09-04
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the synthesis of RAFT reagents is more complicated, and the price of RAFT reagents is more expensive, and there is no industrialized product yet

Method used

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  • A kind of preparation method of polymethyl methacrylate with high molecular weight and narrow distribution
  • A kind of preparation method of polymethyl methacrylate with high molecular weight and narrow distribution
  • A kind of preparation method of polymethyl methacrylate with high molecular weight and narrow distribution

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0049] Add 6g of methyl methacrylate, 0.0234g of 2-iodo-2-methylpropionitrile, and 0.0283g of ethylenediamine bisbenzaldehyde into a 10mL smooth and non-scratched cylindrical quartz reaction bottle to form a uniform solution, and blow nitrogen gas for 2 minutes Exclude the air therein, place it under sunlight, and react for 5.5 hours to obtain polymethyl methacrylate with a number average molecular weight of 32,000 and a dispersion coefficient of 1.15. The GPC curve of the polymer is as figure 1 shown.

example 2

[0051] Add 6g of methyl methacrylate, 0.0234g of 2-iodo-2-methylpropionitrile, and 0.0283g of ethylenediamine bisbenzaldehyde into a 10mL smooth and non-scratched cylindrical quartz reaction bottle to form a uniform solution, and blow nitrogen gas for 2 minutes Exclude the air therein, and react for 20 hours under 14W blue light to obtain polymethyl methacrylate with a number average molecular weight of 33,000 and a dispersion coefficient of 1.25. The GPC curve of the polymer is as figure 2 shown.

example 3

[0053] Add 6g of methyl methacrylate, 0.0117g of 2-iodo-2-methylpropionitrile, and 0.0293 of ethylenediamine bisbenzaldehyde into a 10mL smooth and non-scratched cylindrical quartz reaction bottle to form a uniform solution, and blow nitrogen gas for 2 minutes Exclude the air therein, place it under sunlight, and react for 6.5 hours to obtain polymethyl methacrylate with a number average molecular weight of 50,000 and a dispersion coefficient of 1.16. The GPC curve of the polymer is as image 3 shown.

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Abstract

The invention relates to a preparation method of high-molecular-weight narrow-distribution polymethyl methacrylate. The high-molecular-weight narrow-distribution polymethyl methacrylate (PMMA) is prepared through living free radical polymerization. The polymerization process is regulated through synergistic effect of the added additive and iodo-compound, thus finally obtaining the high-molecular-weight narrow-distribution PMMA. The reaction operation is very simple, the reaction conditions can be sunshine, blue light, white light, green light and the like, the reaction speed is fast, and the reaction time is short.

Description

technical field [0001] The invention prepares polymethyl methacrylate with high molecular weight and narrow distribution through free radical polymerization under the condition of light. Specifically, the polymerization process is regulated through the synergistic effect of added additives and iodo compounds to realize controllable living radical polymerization. The light source used in the reaction process can be sunlight, white light, blue light, green light, and the reaction time is between 3- After 22 hours, polymethyl methacrylate with high molecular weight and narrow distribution was obtained, and the molecular weight and molecular weight distribution of the polymer were determined by gel permeation chromatography (GPC). Background technique [0002] High molecular weight polymethyl methacrylate, commonly known as plexiglass, is called methyl methacrylate resin in the plastic industry. It has unique advantages and characteristics such as light transmittance and good a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/14C08F2/48C08F2/38
CPCC08F2/38C08F2/48C08F120/14
Inventor 石艳李彬李德永付志峰
Owner BEIJING UNIV OF CHEM TECH