Polytetrafluoroethylene (Teflon) has a repeat unit with the formula F2CCF2. A sample of
Chapter 12, Problem 12.131(choose chapter or problem)
Polytetrafluoroethylene (Teflon) has a repeat unit with the formula F2CCF2. A sample of the polymer consists of fractions with the following distribution of chains: Average no. Amount (mol) Fraction of Repeat Units of Polymer 1 273 0.10 2 330 0.40 3 368 1.00 4 483 0.70 5 525 0.30 6 575 0.10 (a) Determine the molar mass of each fraction. (b) Determine the number-average molar mass of the sample. (c) Another type of average molar mass of a polymer sample is called the weight-average molar mass, }w: }w 5 S (} of fraction 3 mass of fraction) total mass of all fractions Calculate the weight-average molar mass of the above sample.
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