Acetalyzation of PVA with Salicylaldehyde
Chemicals: Polyvinyl alcohol, salicylaldehyde, 5%
aqueous sulfuric acid, Dimethyl sulfoxide and methanol
Procedure: A mixture of 20 g PVA, 32 ml salicylaldehyde,
and 20 ml 5% aqueous H2SO4 in 200 ml water was stirred at
60 °C for 4 hours. The precipitated Polymer was filtered and
dissolved in DMSO. The polymer solution was reprecipitated
[2] by a large amount of methanol (Scheme -3).