Number Average Molecular Weight, Mn

• • where Mi is the molecular weight of that species (on the x-axis)
  • where Ni is the number of molecules of a particular molecular species I (on the y-axis).
• Number Average Molecular Weight gives the same weight to all polymer lengths, long and short.
  • Example, What is the molecular weight of a polymer sample in which the polymers molecules are divided into 5 categories.
    • Group Frequency
    • 50,000 1
    • 100,000 4
    • 200,000 5
    • 500,000 3
    • 700,000 1

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