Controllable synthesis method for stereotactic polymethylmethacrylate

Abstract

The invention provides a controllable synthesis method for stereotactic polymethylmethacrylate. The controllable synthesis method comprises the following steps: step 1: taking microcrystalline cellulose as a matrix raw material and 3,5-dimethylphenylisocyanate as a derivatization reagent and synthesizing a helical polymer cellulose-tri(3,5-dimethylphenylcarbamate) through a traditional esterification method; and step 2: taking the cellulose-tri(3,5-dimethylphenylcarbamate) synthesized in step 1 as a chiral inducing agent and adding into methyl methacrylate free radical polymerization reactionto finally prepare the stereotactic polymethylmethacrylate. The controllable synthesis method provided by the invention has a clear and feasible synthesis route and a mature technology, is simple to operate, has a few conditions needing to be controlled and is easy to realize, so that the controllable synthesis method can be used for large-scale batch production; the cellulose, methyl methacrylateand azobisisobutyronitrile, which are used in the controllable synthesis method, have a wide source and are cheap and easy to obtain; and a whole controllable 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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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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