Bet you $5AUS that PVA ain't an acetate.
Poly Vinyl Alcohol is an alcohol, water soluble because of the -OH (hydroxyl group). An alcohol may be converted to an acetate with acetic anhydride: this means to attach the acetate group to the OH, losing a water molecule. No more alcohol group and no more water solubility.
Dacarls:
A-class USA 196, USA 21, H18, H16
"Nothing that's any good works by itself. You got to make the damn thing work"- Thomas Edison
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