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A kind of controllable synthesis method of stereoregular polymethyl methacrylate

A technology of polymethyl methacrylate and methyl methacrylate, which is applied in the field of polymer science, can solve the problems of uncontrollable chain transfer and side reactions, high reactivity and low stability of the growth group, and achieve a synthetic route Clear and actionable, simple to operate, and easy-to-control effects

Active Publication Date: 2021-04-06
HARBIN ENG UNIV
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Problems solved by technology

At present, there are many reports on the use of ionic polymerization or coordination polymerization to realize the stereo control of polymers, but there are few related studies on the behavior of free radical polymerization and its stereo control of polymers.
Furthermore, in the radical polymerization of methyl methacrylate, due to the lack of conjugated substituents in vinyl esters, its propagating group has high reactivity and low stability, leading to uncontrollable chain transfer and side reactions, regulating The stereochemical configuration of polymers is a huge challenge in synthetic polymer chemistry, and most of the current research is about free radical polymerization reaction systems that improve the syndiotacticity of polymers. There are relatively few reports on how to improve the isotacticity of polymers. few

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  • A kind of controllable synthesis method of stereoregular polymethyl methacrylate
  • A kind of controllable synthesis method of stereoregular polymethyl methacrylate
  • A kind of controllable synthesis method of stereoregular polymethyl methacrylate

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] The controllable synthesis method of a kind of stereoregular polymethyl methacrylate of the present invention, concrete steps are as follows:

[0029] 1) Take microcrystalline cellulose and vacuum-dry it at high temperature for 4 hours, then stir and reflux in anhydrous N,N-dimethylacetamide for 12 hours; add an appropriate amount of lithium chloride after cooling to room temperature; continue to stir for 2 hours, then heat up again , add anhydrous pyridine, reflux for 6 hours, add excess 3,5-dimethylphenylisocyanate, react for 13 hours, stop the reaction; cool to room temperature, add methanol to settle, filter and wash, vacuum dry at 60°C to constant weight, and produce The rate is 95%.

[0030] 2), weigh the corresponding mass of the product obtained in 1) according to the 17 groups of different ratios set with the methyl m...

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Abstract

The invention provides a controllable synthesis method of stereoregular polymethyl methacrylate, step 1: using microcrystalline cellulose as a matrix raw material, and using 3,5-dimethylphenylisocyanate as a derivatization reagent, Synthesize the helical polymer cellulose-tri(3,5-dimethylphenylcarbamate) by traditional esterification method; Base carbamate) was added as a chiral inducer in the free radical polymerization of methyl methacrylate, and stereoregular polymethyl methacrylate was finally prepared. The synthesis route of the present invention is clear and feasible, the process is mature, the operation is simple, the conditions that need to be controlled are few and easy to realize, and can be used for large-scale batch production, the source of cellulose, methyl methacrylate and azobisisobutyronitrile used in the present invention It is widely available, cheap and easy to obtain, and the whole synthesis process is simple, mature and easy to control.

Description

technical field [0001] The invention relates to a controllable synthesis method of polymethyl methacrylate, in particular to a controllable synthesis method of stereoregular polymethyl methacrylate, which belongs to the field of polymer science. Background technique [0002] Cellulose is a natural high molecular polymer with a regular helical structure. After proper derivatization, cellulose derivatives with regular three-dimensional structure and excellent chiral recognition performance can be obtained. Among them, cellulose phenyl carbamate derivatives are currently the most widely used chiral stationary phase materials with the highest recognition performance. Its efficient chiral recognition performance comes from its unique main chain regular helical structure. In addition, the main chain of microcrystalline cellulose has strong rigidity, which makes this type of polymer have better stability and rigid helical structure, and can ensure the stability of its regular heli...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/14C08F2/38C08B15/06
CPCC08B15/06C08F2/38C08F120/14
Inventor 沈军孙梦尘毕婉莹孙悦
Owner HARBIN ENG UNIV
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