What is the significance of the polydispersity index (PDI)?

PDI is significant since it is used to describe the range of molecular weights in a polymer. A lower PDI indicates a narrow distribution, while a higher PDI indicates a broader range of sizes. Additionally, understanding PDI allows researchers to design polymers or nanoparticles for specific applications by controlling their size distribution. PDI is also important since molecular weight distribution can affect the physical properties of polymers, including strength, elasticity, and durability.