The optimal temperature range for the synthesis of polyethylene oxide PEO from ethylene oxide EO monomer is typically between 40C and 80C. This temperature range allows for efficient polymerization while minimizing side reactions and degradation of the product.Changing the temperature during the synthesis can have a significant impact on both the yield and molecular weight of the resulting PEO. 1. Yield: Increasing the temperature can lead to a higher reaction rate, which may result in a higher yield of PEO. However, if the temperature is too high, it can cause side reactions and degradation of the product, leading to a lower yield. On the other hand, if the temperature is too low, the reaction rate will be slower, and the yield may also be lower due to incomplete polymerization.2. Molecular weight: The molecular weight of PEO is influenced by the temperature during the synthesis. Higher temperatures can lead to shorter polymer chains, resulting in a lower molecular weight product. This is because the higher temperature increases the rate of chain termination reactions, which limits the chain growth. Conversely, lower temperatures can result in longer polymer chains and a higher molecular weight product, as the rate of chain termination reactions is reduced.In summary, the optimal temperature range for the synthesis of PEO from EO monomer is between 40C and 80C. Adjusting the temperature within this range can influence both the yield and molecular weight of the product, with higher temperatures generally leading to higher yields but lower molecular weights, and lower temperatures resulting in longer polymer chains and higher molecular weights.