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
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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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