Update: 28 September, 2023
This document describes the GPC viscometry analysis of Polydimethyl Siloxane (PDMS) using the Agilent 390-MDS Multi Detector Suite. PDMS is a non-toxic, non-flammable, silicon-based polymeric material known for its unusual rheological behavior. It behaves like a liquid with long flow times or at low temperatures. PDMS is produced in various grades, from liquids to rubbery semi-solids, depending on the molecular weight of the constituent chains. PDMS is widely used in silicone caulks, lubricants, damping fluids, heat transfer fluids, as well as breast and knuckle implants. It is also used as a food additive with the E number E900, functioning as an anti-foaming and anti-caking agent. The inclusion of a viscometer and refractive index detector in the detector array allows for analysis using the universal calibration method, providing accurate molecular weights independent of the calibration standards used. Toluene is preferred over tetrahydrofuran (THF) as the solvent for PDMS analysis due to its isorefractive nature. The 390-MDS was chosen for its ability to perform multi-detector analysis.
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Publication date: 11 June, 2012
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