5. What is number average and weight average molecular weight give equations with molecular weight distribution for a typical polymer. Why do we need more than one MW average ? What is Polydispersity index.

Fundamentals Of Analytical Chemistry
9th Edition
ISBN:9781285640686
Author:Skoog
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Chapter22: Bulk Electrolysis: Electrogravimetry And Coulometry
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5. What is number average and weight average molecular weight give equations with molecular
weight distribution for a typical polymer. Why do we need more than one MW average ? What
is Polydispersity index.
Transcribed Image Text:5. What is number average and weight average molecular weight give equations with molecular weight distribution for a typical polymer. Why do we need more than one MW average ? What is Polydispersity index.
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Number-average - 

number average and weight average molecular weight is that the number average molecular weight refers to the mole fraction of molecules in a polymer sample

whereas the weight average molecular weight is the weight fraction of molecules in a polymer sample

 

The monomer C3H6 - Typical polymer 

 

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