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what is mean by polydispersityindex?

The polydispersity index (PDI) or heterogeneity index, or simply dispersity (?), is a measure of the distribution of molecular mass in a given polymer sample. 

IUPAC has deprecated the use of the term polydispersity index having replaced it with the term dispersity, represented by the symbol ? and calculated using the equation 
? = Mm/Mn, where Mm is the mass-average molar mass and Mn is the number-average molar mass. 


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