Why did Poly-vinyl Alcohol and water mixture boil before boiling point of water?

18 August 2023 1 1K Report

I was preparing Poly-vinyl Alcohol (6 wt%) solution in water at 120°C. Given that the boiling point of water is 100°C and boiling point of Poly-vinyl Alcohol (mw 115,000) 228°C. But the solution vaporized at a temperature between 80 to 90°C. What can be the possible causes.

PS- I kept the stirrer at 400rpm and 120°C.

William Mcdaniel

The lower boiling point suggests contaminants, perhaps ethanol (BP 78*C) or isopropanol (BP 82.5*C). Fractional distillation would likely help you identify any contaminants, and give you a purified fraction of vinyl alcohol. Best of luck!

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