The mass average molecular mass and number av | vedclass

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Question

(B) The polydispersity index $(PDI)$ is defined as the ratio of the weight average molecular mass $(\overline{M_w})$ to the number average molecular m

Vedclass · Accepted Answer

$> 1$

Vedclass · Answer

(B) The polydispersity index $(PDI)$ is defined as the ratio of the weight average molecular mass $(\overline{M_w})$ to the number average molecular mass $(\overline{M_n})$.Given: $\overline{M_w} = 40,000$ and $\overline{M_n} = 30,000$.$PDI = \frac{\overline{M_w}}{\overline{M_n}} = \frac{40,000}{30,000} = 1.33$.Since $1.33 > 1$,the correct option is $B$.

The mass average molecular mass and number average molecular mass of a polymer are respectively $40,000$ and $30,000$. The polydispersity index of the polymer will be:

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