3.6
One kilogram of a polyester with a number-average molar mass M₁ = 10,000 g mol-¹ is mixed
with one kilogram of another polyester with a M₁=30,000 g mol-¹. The mixture then is
heated to a temperature at which ester interchange occurs and the heating continued until
full equilibration is achieved. Assuming that the two original polyester samples and the new
polyester, produced by the ester interchange reaction, have the most probable distribution of
molar mass, calculate M₁, and weight-average molar mass M for the mixture before and after
the ester interchange reaction.
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