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Method for preparing cellulose grafted copolymer in homogeneous phase by utilizing enzymatic system

A cellulose grafting and copolymer technology, applied in the field of functional cellulose and its preparation, can solve complex conditions, toxic and harmful chemicals and other problems, achieve wide application prospects, improve thermal stability, and simple process

Active Publication Date: 2019-10-18
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for preparing cellulose graft copolymer in homogeneous phase by using an enzymatic system, which overcomes the defects that toxic and harmful chemicals and complex conditions need to be introduced in the traditional initiation mode, and can be obtained at room temperature, It can be carried out under neutral and mild conditions

Method used

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  • Method for preparing cellulose grafted copolymer in homogeneous phase by utilizing enzymatic system
  • Method for preparing cellulose grafted copolymer in homogeneous phase by utilizing enzymatic system
  • Method for preparing cellulose grafted copolymer in homogeneous phase by utilizing enzymatic system

Examples

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Effect test

Embodiment 1

[0041] (1) Cut 2g of wood pulp board cellulose (purchased from Henan Xinxiang Natural Chemical Co., Ltd., DP=900), add 44g of ionic liquid 1-allyl-3-methylimidazolium chloride (AMIMCl), and heat to 90 °C, stirred to obtain a homogeneous solution. Add 41g of N,N-dimethylformamide and continue stirring to obtain a clear and transparent solution.

[0042] (2) Weigh 30 g of the cellulose solution and heat it to 110° C. in an oil bath. Then weigh 2.7g of tert-butyl acetoacetate, add it into the above liquid, continue heating and stirring for 1.5h, test its water solubility, and stop the reaction after the water solubility is good. Pour the reaction solution into a large amount of ethanol to precipitate a precipitate, filter and dry with suction to obtain cellulose acetoacetate.

[0043] (3) The cellulose acetoacetate was prepared into an aqueous solution with a mass fraction of 1% by using a PBS buffer solution with a pH of 7.2. Weigh 11.5 g of cellulose acetoacetate aqueous sol...

Embodiment 2

[0051] (1) Cut 2g of wood pulp board cellulose (purchased from Henan Xinxiang Natural Chemical Co., Ltd., DP=900), add 44g of ionic liquid 1-allyl-3-methylimidazolium chloride (AMIMCl), and heat to 90 °C, stirred to obtain a homogeneous solution. Add 41g of N,N-dimethylformamide and continue stirring to obtain a clear and transparent solution.

[0052] (2) Weigh 30 g of the cellulose solution and heat it to 110° C. in an oil bath. Then weigh 2.7g of tert-butyl acetoacetate, add it into the above liquid, continue heating and stirring for 1.5h, test its water solubility, and stop the reaction after the water solubility is good. Pour the reaction solution into a large amount of ethanol to precipitate a precipitate, filter and dry with suction to obtain cellulose acetoacetate.

[0053] (3) The cellulose acetoacetate was prepared into an aqueous solution with a mass fraction of 1% by using a PBS buffer solution with a pH of 7.2. Weigh 11.5 g of cellulose acetoacetate aqueous sol...

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Abstract

The invention relates to a method for preparing a cellulose grafted copolymer in a homogeneous phase by utilizing an enzymatic system. The cellulose grafted copolymer has a structure as shown in a general formula I which is described in the specification. The cellulose grafted copolymer is prepared through the following steps: adding a vinyl monomer into an aqueous solution of cellulose acetoacetate, and carrying out a reaction in an enzymatic catalytic system. The method provided by the invention adopts biological enzyme for catalysis in the whole process, is green and environmentally-friendly, has simple conditions, is convenient to operate, and is expected to be extensively and commercially used.

Description

technical field [0001] The invention belongs to the field of functional cellulose and its preparation, in particular to a method for preparing a cellulose graft copolymer in a homogeneous phase by using an enzymatic system. Background technique [0002] Cellulose graft copolymerization is the most commonly used modification method in cellulose modification. It can directly connect functional polymers to cellulose macromolecules through hydroxyl groups. It is a very simple and direct modification method. By changing the type of grafted polymer, the length of the grafted chain and the grafting density, the purpose of changing the properties of the material can be achieved, and the regulation is very flexible and convenient. The obtained cellulose graft copolymers usually have the advantages of both natural polymers and synthetic polymers, and can overcome the solubility and plasticity of cellulose by introducing different polymers while retaining the advantages of cellulose it...

Claims

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Application Information

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IPC IPC(8): C08F251/02C08F220/56C08F220/14C08F220/20C08F220/38C08B3/16
CPCC08B3/16C08F251/02
Inventor 隋晓锋王若淳荣立夺王碧佳冯雪凌毛志平徐红张琳萍钟毅
Owner DONGHUA UNIV
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