An efficient plasticizer additive analysis method
This document details an application for analyzing polymers that contain plasticizers, specifically focusing on the determination of polymer molecular weight distribution and qualitative information about additives. It highlights the benefits of using Agilent Evaporative Light Scattering Detection (ELSD) over Refractive Index (RI) detection, noting that ELSD provides a significantly improved signal-to-noise ratio and is independent of dn/de effects.
The note specifies the use of PLgel 5 um MIXED-C columns for this application, citing their high efficiency and broad resolving molecular weight range. It presents results from the analysis of a polymer containing dibutylphthalate (DBP), demonstrating the system's ability to separate the polymer from the additive and a flow rate marker (toluene). The conclusion emphasizes the robust design of the Agilent ELSD and the suitability of the system for compounds with no chromophores.
| Column dimensions | 300 x 7.5 mm |
|---|---|
| Column part number | PL1110-6500 |
| Nebulizer temperature | 40 °C |
| Evaporator temperature | 90 °C |
| Carrier gas flow | 1.5 SLM |
| Eluent | THF |
| Flow rate | 1.0 mL/min |
ELSD provides a significantly improved signal to noise ratio and the detector response is almost independent of dn/de effects.
The PLgel 5 um MIXED-C columns are recommended due to their high efficiency and broad resolving molecular weight range.
The conditions are a nebulizer temperature of 40 °C, evaporator temperature of 90 °C, and a gas flow of 1.5 SLM.