Carboxyl End Group
| Sample Type | Required Quantity | Equipment Used |
| Resin Flake Preform Bottle |
25 grams | Titration Apparatus |
Purpose
This procedure determines the carboxyl end group content in a PET
sample.
Description
The procedure involves the titration of the carboxyl end groups with
potassium hydroxide in an o-cresol/chloroform medium to a bromophenol
blue endpoint. A known weight of PET sample is dissolved in o-cresol
then chloroform and bromophenol blue are added to the solution. The
solution is then titrated with potassium hydroxide until the color
changes to blue as a result of the end group reaction. Based on the
amount of KOH required for the titration, the quantity of carboxyl end
groups is calculated.
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