Synthesis of poly(vinyl alcohol Sample Clauses

Synthesis of poly(vinyl alcohol. The synthesis of PVA used to produce the nanoparticles was based on direct saponification method. PVA 32% hydrolysis was produced from a poly(vinyl acetate) via a stiochiometric reaction according to reaction (Xxxxx et al., 2008). For 40% hydrolysis, for example, the starting mass of PVAc was 1 g, this provided 0.01163 moles of the vinyl acetate monomer and thus 0.004652 moles of NaOH was required to achieve 40% hydrolysis, assuming a 100% reaction efficiency. The concentration of NaOH solution was 0.18608 g/mL and this was added dropwise to 1 g of PVAc dissolved in 8 mL of acetone in a round bottom flask with a small 12 mm magnetic stirrer. The materials refluxed for a period of 1.5 hour (heating level 5, ~80 °C ) with continuous mild magnetic stirring and then the solution was transferred to a 50 mL beaker and placed in the fume hood to allow the organic solvent to evaporate overnight. A purification step was employed to remove sodium acetate by-product. Purification was conducted by adding 5 mL of preheated 80 °C deionised water and incubating the solution for 5 minutes, filtering through a 47-μm cellulose nitrate membrane under the vacuum and collecting the product. The purified polymer was placed on a grease proof paper weighed previously, dried at 80°C over night and the amount of product was weighed on the subsequent day to generate a yield.
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