The optimized reaction conditions for producing polyvinyl alcohol PVA with a high molecular weight from vinyl acetate monomer VAM involve a two-step process: the polymerization of VAM to polyvinyl acetate PVAc and the hydrolysis of PVAc to PVA.1. Polymerization of VAM to PVAc:- Temperature: The optimal temperature for the polymerization of VAM to PVAc is typically in the range of 50-70C. Higher temperatures can lead to faster reaction rates but may also cause side reactions and degradation of the polymer.- Concentration: The concentration of VAM should be high to promote the formation of high molecular weight PVAc. A concentration of around 40-60% VAM in the reaction mixture is commonly used.- Catalyst: Free radical initiators, such as azobisisobutyronitrile AIBN or benzoyl peroxide, are used as catalysts for the polymerization of VAM. The optimal concentration of the initiator is typically in the range of 0.1-1.0 wt% based on the VAM content.- Inert atmosphere: The polymerization should be carried out under an inert atmosphere, such as nitrogen or argon, to prevent side reactions with oxygen.2. Hydrolysis of PVAc to PVA:- Temperature: The hydrolysis of PVAc to PVA is typically carried out at elevated temperatures, in the range of 60-90C, to increase the reaction rate and achieve a high degree of hydrolysis.- Concentration: The concentration of PVAc in the reaction mixture should be around 10-20 wt% to ensure a high degree of hydrolysis and the formation of high molecular weight PVA.- Catalyst: The hydrolysis of PVAc is catalyzed by either acidic or alkaline catalysts. Common acidic catalysts include hydrochloric acid HCl and sulfuric acid H2SO4 , while common alkaline catalysts include sodium hydroxide NaOH and potassium hydroxide KOH . The optimal concentration of the catalyst is typically in the range of 1-5 wt% based on the PVAc content.- Reaction time: The hydrolysis reaction should be carried out for an extended period, typically 2-6 hours, to achieve a high degree of hydrolysis and the formation of high molecular weight PVA.By optimizing these reaction conditions, it is possible to produce polyvinyl alcohol with a high molecular weight from vinyl acetate monomer.