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Photometric Titration of Carboxyl End Groups in Polymers

Metrohm AG
21 Mar 2014

This Application Note describes the photometric titration of carboxyl end groups in polymers using the Optrode. The acidic end groups of the polymer are titrated with an ethanolic KOH solution using bromophenol blue as indicator.

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Optrode Sensor for Titration

Metrohm AG

Sensor for titration with photometric endpoint recognition. Eight wave lengths: 470, 502, 520, 574, 590, 610, 640 and 660 nm 100% solvent-resistant due to glass shaft Compact and space-saving Very easy to clean Easy to change the wave lengths Both new and existing titration systems can be furnished with the optrode. The power supply is provided directly through the USB interface of a Metrohm instrument (Titrino plus, Ti-Touch, Titrando, USB sample changer). With older models without a USB interface, the power supply can also be provided by means of an optional USB power supply unit.

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TitrationTitration is an analytical technique for determining substance concentration in a solution. For titration consider a manual or automated system, volumetric or coulometric reagent addition and indication by a potentiometer, spectrometer, turbidometer or by the Karl Fischer method. Other features of titration to consider include burettes, reagents, concentration range, reaction time and autosamplers.PolymersPolymers are large molecules made up of many repeat units. Natural polymers such as DNA and proteins are essential to life, whereas synthetic polymers such as polystyrene and polyethylene are used widely due to their functionality. Typical techniques for analysis include GPC, SEC, DSC, FT-IR and NMR.

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Photometric Titration of Carboxyl End Groups in Polymers