Polytetrafluoroethylene (Teflon) has a repeat unit with
Chapter 12, Problem 12.126(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: Pressure (katm) 100 50 1 Temperature (C) 0 100 200 300 V III IV II Liquid I Average no. of repeat units Amount (mol) Fraction of polymer 1 2 3 4 5 6 273 330 368 483 525 575 0.10 0.40 1.00 0.70 0.30 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, : Calculate the weight-average molar mass of the above sample.
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