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What is poly dispersity index?

Important Questions on Polymers

MEDIUM
Chemistry>Organic Chemistry>Polymers>Molecular Mass of Polymers
The Poly Dispersity Index (PDI) of a polymer is 1.5. If its number average molecular mass is 30,000, calculate its weight average molecular mass.
EASY
Chemistry>Organic Chemistry>Polymers>Molecular Mass of Polymers
Write the formula to determine 'weight average molecular weight' of polymers.
MEDIUM
Chemistry>Organic Chemistry>Polymers>Molecular Mass of Polymers
The polydispersity index of the polymer is always:
MEDIUM
Chemistry>Organic Chemistry>Polymers>Molecular Mass of Polymers
A polymer sample is made up of 30% molecules of mass 20,000,40% of 30,000 and the rest mass of 60,000 . Its number average molecule mass is
HARD
Chemistry>Organic Chemistry>Polymers>Molecular Mass of Polymers

Which option is correct for synthetic polymer?

EASY
Chemistry>Organic Chemistry>Polymers>Molecular Mass of Polymers
What is PDI (Poly Dispersity Index)?
HARD
Chemistry>Organic Chemistry>Polymers>Molecular Mass of Polymers
Explain the determination of molecular mass of polymers by number average molecular weight method.
HARD
Chemistry>Organic Chemistry>Polymers>Molecular Mass of Polymers
In a polymer sample, the molecular weight of 10 molecules is 20,000, molecular weight of 30 molecules is 35,000 and molecular weight of another 20 molecules is 40,000 then calculate the number average molecular weight (M-n) of the polymer.
MEDIUM
Chemistry>Organic Chemistry>Polymers>Molecular Mass of Polymers
In a polymer sample 35% of molecules have a molecular mass 24,000, 40% have 30,000 and the rest molecules have a molecular mass of 50,000. What is the number average molecular mass of the polymer?
MEDIUM
Chemistry>Organic Chemistry>Polymers>Molecular Mass of Polymers
Define polydisperse polymer.
MEDIUM
Chemistry>Organic Chemistry>Polymers>Molecular Mass of Polymers

Represent the union of two sets by Venn diagram for each of the following.

X={x | x is a prime number between 80 and 100}

Y={y | y is an odd number between 90 and 100}

HARD
Chemistry>Organic Chemistry>Polymers>Molecular Mass of Polymers
Why molecular weight of polymers is taken as average molecular weight. How many types average molecular weight can be represented? Explain each type.
MEDIUM
Chemistry>Organic Chemistry>Polymers>Molecular Mass of Polymers
Explain the determination of molecular mass of polymers by weight average molecular weight method.
HARD
Chemistry>Organic Chemistry>Polymers>Molecular Mass of Polymers
In a polymer sample, the molecular weight of 30 molecules is 25,000, molecular weight of 25 molecules is 30,000 and molecular weight of another 40 molecules is 43,000 then calculate the weight average molecular weight (M-w) of the polymer.
MEDIUM
Chemistry>Organic Chemistry>Polymers>Molecular Mass of Polymers
In a polymer, there are 300 molecules with a molecular weight of 100, 200 molecules with a molecular weight of 1000 and 100 molecules with a molecular weight of 10000. The number average molecular weight of polymer is
HARD
Chemistry>Organic Chemistry>Polymers>Molecular Mass of Polymers
Write formula for number average molecular weight (M-n).
HARD
Chemistry>Organic Chemistry>Polymers>Molecular Mass of Polymers
In a polymer sample, the molecular weight of 20 molecules is 20,000, molecular weight of 40 molecules is 30,000 and molecular weight of another 20 molecules is 40,000 then calculate the number average molecular weight (M-n) of the polymer.
HARD
Chemistry>Organic Chemistry>Polymers>Molecular Mass of Polymers
What is polydispersity index? Explain.
MEDIUM
Chemistry>Organic Chemistry>Polymers>Molecular Mass of Polymers
Define molecular mass of a polymer.
HARD
Chemistry>Organic Chemistry>Polymers>Molecular Mass of Polymers
Explain the method of determining the molar mass of the polymer.