The optimum temperature and pressure for the synthesis of polyethylene from ethylene monomer using Ziegler-Natta catalysis vary depending on the specific catalyst system and the desired properties of the resulting polyethylene. However, generally speaking, the following conditions are considered optimal for this process:Temperature: The temperature range for the synthesis of polyethylene using Ziegler-Natta catalysis is typically between 60-100C 140-212F . Lower temperatures favor the formation of high-density polyethylene HDPE , while higher temperatures promote the formation of low-density polyethylene LDPE .Pressure: The pressure range for this process is typically between 1-50 atmospheres atm . Lower pressures are used for the production of HDPE, while higher pressures are used for the production of LDPE.It is important to note that the specific temperature and pressure conditions should be tailored to the particular Ziegler-Natta catalyst system being used and the desired properties of the polyethylene product. Additionally, other factors such as reaction time, catalyst concentration, and monomer concentration can also influence the outcome of the polymerization process.