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In organic chemistry, 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 always greater than 1, but as the polymer chains approach uniform chain length, the PDI approaches unity (1). For some natural polymers PDI is almost taken as unity. The PDI from polymerization is often denoted as:

\ PDI = M_w/M_n

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In organic chemistry, 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 always greater than 1, but as the polymer chains approach uniform chain length, the PDI approaches unity (1). For some natural polymers PDI is almost taken as unity. The PDI from polymerization is often denoted as:

\ PDI = M_w/M_n

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uses of index

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Sensitive Index is a criticle Index.

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The BSE Index or the Sensex as it is popularly known, is the index of the performance of the 30 largest & most profitable, popular companies listed in the index. Each company that is part of the index has its own weightage in the value of the Index. Since the number of companies is lesser, the index variations are higher when compared to the Nifty index.

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