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 has a PDI of 1. What does this indicate about the sample?
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.
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 Mn = 15,000 g/mol and Mw = 15,000 g/mol. What is the PDI and what does it indicate?
A polymer sample has Mn = 25,000 g/mol and Mw = 50,000 g/mol. Is the sample monodisperse?
The number average molecular mass (Mn) of a polymer is calculated using which of the following formulas? (1) ΣNiMi/ΣNi, (2) ΣNiMi2/ΣNiMi, (3) ΣMi/ΣNi, (4) ΣNi/ΣMi
What is the term used to describe the average mass of polymer molecules in a sample? (1) Number average molecular mass, (2) Mass average molecular mass, (3) Relative molecular mass, (4) Molar mass
Which of the following is a direct consequence of a high polydispersity index in a polymer sample? (1) Uniform properties, (2) Broad range of physical properties, (3) High crystallinity, (4) Low melting point
Which of the following is a typical value for the polydispersity index (PDI) of a synthetic polymer? (1) 1, (2) 1.5, (3) 10, (4) 100
Fill in the blank: The _______ is a measure of the distribution of molecular mass in a given polymer sample.
Fill in the blank: The _______ method for determining molecular mass of polymers is based on the scattering of light by polymer solutions.
Fill in the blank: The _______ method separates polymer molecules based on their size in solution to determine molecular mass distribution.
Fill in the blank: The _______ method uses the increase in viscosity of a polymer solution to estimate its molecular mass.
A polymer sample has Mn = 25,000 g/mol and Mw = 50,000 g/mol. Is the sample monodisperse?
True or False: A higher polydispersity index means the polymer sample has a broader distribution of molecular masses.
True or False: The mass average molecular mass (Mw) can be determined by light scattering methods.
True or False: The mass average molecular mass (Mw) is always equal to or greater than the number average molecular mass (Mn) for a given polymer sample.
