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Which of the following condition is for polydisperse polymers?

$\begin{array}{1 1}(a)\;\bar{M_w} > \bar{M_N}\\(b)\;\bar{M_w} < \bar{M_n}\\(c)\;\bar{M_w} = \bar{M_N}\\(d)\;\text{None of these}\end{array}$

1 Answer

The polymers whose molecules have wide range of molecular masses are called polydisperse polymers.For those polymers,$\bar{M_w} > \bar{M_N}$ and therefore polydispersity index (i.e) $\bar{M_w}/\bar{M_n} > 1$
Hence (a) is the correct answer.
answered Mar 12, 2014 by sreemathi.v