Question

A mixture of R(COOH)2 and R(OH)2 in the mole ratio of 1:1 was used for studying the kinetics of polyesterification. The mixture, having an R(COOH)2 concentration of 3.808 mol/kg, was initially polymerized under mild conditions to about 80% conversion of the carboxylic acid groups. The mixture was then further polymerized in the presence of an added strong acid catalyst at a sufficiently high temperature to facilitate the removal of the water of condensation by passing a stream of nitrogen gas. The polymerization in the second stage yielded the following data: Time (min) [COOH] (mol/kg) 0 1.71 5 1.47 10 1.28 20 1.00 30 0.80 40 0.66 60 0.47 90 0.30 Determine the polyesterification rate constant for the monomer system.

          A mixture of R(COOH)2 and R(OH)2 in the mole ratio of 1:1 was used for studying the kinetics of polyesterification. The mixture, having an R(COOH)2 concentration of 3.808 mol/kg, was initially polymerized under mild conditions to about 80% conversion of the carboxylic acid groups. The mixture was then further polymerized in the presence of an added strong acid catalyst at a sufficiently high temperature to facilitate the removal of the water of condensation by passing a stream of nitrogen gas. The polymerization in the second stage yielded the following data:

Time (min)   [COOH] (mol/kg)
0                  1.71
5                  1.47
10                1.28
20                1.00
30                0.80
40                0.66
60                0.47
90                0.30

Determine the polyesterification rate constant for the monomer system.

Added by Raven W.

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