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What is PDI (Poly Dispersity Index ) ?...

What is PDI (Poly Dispersity Index ) ?

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Poly Dispersity Index (PDI) : The ratio between weight average molecular mass `(bar(M)_w)` and the number avetage molecular mass `(bar(M)_n)` of a polymer is called poly Dispersity Index (PDI).
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The poly dispersity index (PDI) of a polymer is ( overline(M_(w)) = weight average molecular mass and overline(M_(n)) number average molecular mass)

If overline(M)_(e) is the weight average molecular weight and overline(M)_(e) is the number average molecular weight of a polymer, the poly dispersity index (PDI) of the polymer is given by

If bar(M)_(w) is the weight -average molecular weight and bar(M)_(n) is the number -average molecular weight of polymer, the poly dispersity index (PDI) of the polymer is given by

The mass average molecular mass and number average molecular mass of a polymer are respectively 40,000 and 30,000. The poly dispersity index of polymer will be

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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-POLYMERS-VERY SHORT ANSWER QUESTIONS
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  5. What are thermosetting polymers?Give example .

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  14. Name the different types of molecular masses of polymers .

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  15. What is PDI (Poly Dispersity Index ) ?

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  16. What is vulcanization of rubber ?

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