Method for preparing water-soluble PVA resin through photoinduction-reversible addition fragmentation chain transfer polymerization

A technology of chain transfer polymerization and addition fragmentation, which is applied in the field of light-induced-reversible addition fragmentation chain transfer polymerization to prepare water-soluble PVA resin, which can solve the molecular structure of polyvinyl acetate, the control of molecular weight size distribution index, and the application range of PVA. Limitation and other issues, to achieve the effect of recoverable catalyst concentration, good oxygen resistance and good controllability

Inactive Publication Date: 2020-10-02
NANCHANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as in the method of the above-mentioned Chinese patent CN102746462A, side reactions such as chain transfer, chain termination, coupling, and branching are prone to occur in traditional free radical polymerization, and the molecular structure, molecular weight, and distribution index of polyvinyl acetate cannot be controlled. , so that the application range of PVA prepared by hydrolysis of polyvinyl acetate prepared by free radical polymerization is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Under room temperature, eosin Y is used as photocatalyst, xanthate is used as chain transfer agent, ethanol is used as solvent, vinyl acetate and acrylic acid are polymerized by PET-RAFT. Add vinyl acetate: acrylic acid: xanthate: eosin Y=100:5:1:0.05 into a 100mL round-bottomed flask at a molar ratio, add a stirring bar, and go through 3 cycles of freezing-vacuumizing-argon, Seal the bottle under an inert atmosphere, then place the reaction bottle on a magnetic stirrer, and start the reaction at room temperature under the irradiation of a 500W high-pressure mercury lamp. After reacting for 48 hours, the obtained product was put into a vacuum oven and dried to constant weight to obtain a polyvinyl acetate-acrylic acid copolymer. The conversion of the product was calculated and its molecular weight and molecular weight distribution were determined by GPC. Under the conditions of this ratio, the molecular weight of the polymer increases linearly with the increase of the ...

Embodiment 2

[0023] Under room temperature, eosin Y is used as photocatalyst, xanthate is used as chain transfer agent, ethanol is used as solvent, vinyl acetate and acrylic acid are polymerized by PET-RAFT. Put vinyl acetate: acrylic acid: xanthate: eosin Y=100:5:1:0.05 in molar ratio into a 100mL round-bottomed flask, add a stirrer, place the reaction bottle on a magnetic stirrer, and Conditions, room temperature and under the irradiation of a 500W high-pressure mercury lamp to start the reaction. After reacting for 72 hours, the obtained product was put into a vacuum oven and dried to constant weight to obtain a polyvinyl acetate-acrylic acid copolymer. The conversion of the product was calculated and its molecular weight and molecular weight distribution were determined by GPC. Under the conditions of this ratio, the molecular weight of the polymer increases linearly with the increase of the conversion rate. After 72 hours of reaction, the monomer conversion rate reached 32.22%, and ...

Embodiment 3

[0025] At room temperature, Ru(bpy) 3 Cl 2 As photocatalyst, xanthate as chain transfer agent, ethanol as solvent, PET-RAFT polymerization of vinyl acetate and acrylic acid. Molar ratio vinyl acetate:acrylic acid:xanthate:Ru(bpy) 3 Cl 2 =120:6:1:0.005 into a 100mL round-bottomed flask, add a stirrer, go through 3 cycles of freezing-vacuumizing-argon filling, seal the bottle under an inert atmosphere, and then place the reaction bottle on a magnetic stirrer , start the reaction at room temperature under the illumination of a green LED light. After reacting for 36 hours, the obtained product was put into a vacuum oven and dried to constant weight to obtain a polyvinyl acetate-acrylic acid copolymer. The conversion of the product was calculated and its molecular weight and molecular weight distribution were determined by GPC. Under the conditions of this ratio, the molecular weight of the polymer increases linearly with the increase of the conversion rate. After 36 hours of...

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Abstract

The invention belongs to the technical field of high polymer material synthesis, and discloses a method for preparing water-soluble PVA resin through photoinduction-reversible addition fragmentation chain transfer polymerization. The method comprises the following steps: (1) adding vinyl acetate, acrylic acid, a chain transfer agent and a photocatalyst into a reactor, carrying out ultrasonic dispersion, and reacting for 24-72 hours under anaerobic or aerobic conditions and light irradiation to obtain a vinyl acetate-acrylic acid copolymer with controllable molecular weight and molecular weightdistribution; and (2) carrying out alcoholysis on the vinyl acetate-acrylic acid copolymer under an alkaline condition to obtain a water-soluble polyvinyl alcohol-acrylic acid copolymer. The raw materials used in the method are rich, cheap and easily available, the reaction condition is mild, the method is simple to operate, the vinyl acetate-acrylic acid copolymer with controllable molecular weight and molecular weight distribution can be obtained, the molecular structure, molecular weight and distribution index of the polyvinyl acetate-acrylic acid copolymer are further controlled, and theapplication range of the water-soluble PVA resin is widened.

Description

technical field [0001] The invention relates to the technical field of polymer material synthesis, in particular to a method for preparing water-soluble PVA resin through light-induced-reversible addition-fragmentation chain transfer polymerization. Background technique [0002] Polyvinyl alcohol (PVA) is non-toxic and tasteless, non-irritating to the skin, does not cause skin allergies, has good mechanical properties, optical properties, biocompatibility, and good film-forming and cohesive force. be widely used. [0003] The solubility of polyvinyl alcohol is largely affected by the degree of polymerization and the degree of alcoholysis. Due to the difference in degree of polymerization, degree of alcoholysis and different methods of alcoholysis, polyvinyl alcohol has a great difference in dissolution time and temperature. difference. However, most of PVA needs to be dissolved when processing and producing downstream products. In view of the fact that PVA resin is not eas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F218/08C08F220/06C08F2/38C08F2/48C08F8/00
CPCC08F218/08C08F2/38C08F2/48C08F8/00C08F2438/03C08F220/06
Inventor 鲁莽吴雪姣
Owner NANCHANG NORMAL UNIV
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