The synthesis of polyethylene oxide PEO from ethylene oxide EO monomer typically involves a ring-opening polymerization reaction, which can be catalyzed by either anionic or cationic catalysts. The optimal temperature and pressure conditions for this reaction depend on the specific catalyst and reaction system being used.For anionic catalysts, such as potassium alkoxides or alkali metal alkoxides, the reaction is typically carried out at temperatures between 100-150C and at atmospheric pressure. This temperature range allows for a high reaction rate while minimizing side reactions and degradation of the polymer.For cationic catalysts, such as boron trifluoride etherate BF3OEt2 or other Lewis acids, the reaction is typically carried out at lower temperatures, around 0-60C, and at atmospheric pressure. These lower temperatures help to minimize side reactions and improve the purity of the final product.It is important to note that the specific temperature and pressure conditions may need to be optimized for each individual reaction system, taking into account factors such as the catalyst concentration, reaction time, and desired molecular weight of the PEO. Additionally, the reaction should be carried out under an inert atmosphere e.g., nitrogen or argon to prevent unwanted side reactions with oxygen or moisture.