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Molecular Weight of Polymers

If #160;Mw ...

Question

If Mw is the weight average molecular weight and Mn is the number average molecular weight of a polymer, the polydispersity index (PDI) of the polymer is given by:

\frac{{¯ ¯¯¯¯ ¯ M}_{n}}{M_{w}}

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\frac{{¯ ¯¯¯¯ ¯ M}_{w}}{{¯ ¯¯¯¯ ¯ M}_{n}}

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{¯ ¯¯¯¯ ¯ M}_{w} \times {¯ ¯¯¯¯ ¯ M}_{n}

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\frac{1}{{¯ ¯¯¯¯ ¯ M}_{w} \times {¯ ¯¯¯¯ ¯ M}_{n}}

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Solution

The correct option is B
$\frac{{¯ ¯¯¯¯ ¯ M}_{w}}{{¯ ¯¯¯¯ ¯ M}_{n}}$

Polydispersity index , PDI gives an idea about homogenity of a polymer .

$P D I = \frac{w e i g h t a v e r a g e m o l e c u l a r m a s s (_{w})}{n u m b e r a v e r a g e m o l e c u l a r m a s s (_{n})}$

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_{W}

_{n}

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({¯ ¯¯¯¯ ¯ M}_{w} =

{¯ ¯¯¯¯ ¯ M}_{n} =

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120, 000 g / m o l

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{- M}_{w}

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