Molecular Mass of Polymers
Chemistry ⇒ Polymers and Macromolecules
Molecular Mass of Polymers starts at 12 and continues till grade 12.
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A polymer sample contains 3 molecules of mass 10,000 g/mol, 2 molecules of mass 20,000 g/mol, and 1 molecule of mass 30,000 g/mol. Calculate the number average molecular mass (Mn).
A polymer sample has a mass average molecular mass (Mw) of 50,000 g/mol and a number average molecular mass (Mn) of 40,000 g/mol. What is its polydispersity index (PDI)?
A polymer sample has a PDI of 1. What does this indicate about the sample?
A polymer sample has Mn = 15,000 g/mol and Mw = 15,000 g/mol. What is the PDI and what does it indicate?
A polymer sample has the following distribution: 1 molecule of 10,000 g/mol, 2 molecules of 20,000 g/mol, and 2 molecules of 40,000 g/mol. Calculate the number average molecular mass (Mn).
A polymer sample has the following distribution: 2 molecules of 5,000 g/mol, 3 molecules of 10,000 g/mol, and 5 molecules of 20,000 g/mol. Calculate the mass average molecular mass (Mw).
A polymer sample has the following distribution: 4 molecules of 8,000 g/mol and 6 molecules of 12,000 g/mol. Calculate the number average molecular mass (Mn).
Describe how gel permeation chromatography (GPC) is used to determine the molecular mass distribution of polymers.
Describe how the molecular mass of a polymer affects its melting point.
Describe the effect of increasing molecular mass on the tensile strength of a polymer.
Explain the difference between number average molecular mass (Mn) and mass average molecular mass (Mw).
Explain the significance of the polydispersity index (PDI) in polymer science.
Explain why polymers do not have a fixed molecular mass like simple molecules.
Explain why the mass average molecular mass (Mw) is more sensitive to the presence of high molecular mass species than the number average molecular mass (Mn).
What is the main limitation of using osmometry to determine the molecular mass of polymers?
