The purchased EVA (VA content 40%) product is dissolved in toluene solution, and then a mixture of sodium hydroxide and alcohol is added, the concentration is about 1mol/l and 0.25mol/l. The infrared test results of the product are normal, but it has been unable to dissolve in DMSO. There is no major research in this area can answer or discuss. Whether the EVA synthesized by oneself and then make EVOH will dissolve in dmso better.
EVA it is not soluble in polar solvents, that is why it is sold in Toluene. The only reference that I have it is that is soluble as much as 8% concentration of anhydrous dimethyl sulfoxide (DMSO).
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Thank you for your answer. I mainly want to synthesize EVOH, and the reactor I purchased has not yet arrived, so I first use the purchased EVA as the raw material for synthesis. However, I cannot purchase the one with more than 40% vinyl acetate content, so I cannot obtain conventional EVOH (the vinyl acetate content is about 60 or more). The product could not be dissolved in dmso after the saponification with methanol-sodium hydroxide solution, which really confused me.
Do to try different saponification methods and/or conditions? like this ones?
Article Alcoholysis of Ethylene-Vinyl Acetate Copolymer Catalyzed by...
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