Question

The number average molecular mass and mass average molecular mass of a polymer are $30,000$ and $40,000$ respectively. The PDI of the polymer is

• A. $<1$
• B. $>1$
• C. $1$
• D. $0$

Answer 1

The correct option is B $>1$

PDI (Polydispersity Index) is the ratio of the mass average molecular mass to the number average molecular mass.

Therefore, $\text{PDI}=\frac{40000}{30000}=1.33$.

Thus, PDI of the polymer is $>1$.