Question

The abbreviation PDI refers to__________.

• A. name of the polymer
• B. polydispersity index of the polymer
• C. application of the polymer
• D. polydiagonal index

Answer 1

Answer: (B)

polydispersity index of the polymer

The polydispersity index (PDI) is a measure of the distribution of molecular mass in a given polymer sample. The PDI calculated is the weight average molecular weight divided by the number average molecular weight. It indicates the distribution of individual molecular masses in a batch of polymers. The PDI has a value equal to or greater than $1$, but as the polymer chains approach uniform chain length, the PDI approaches unity.