This article describes the analysis of polybutadiene terephthalate (PBT) resin. PBT resins are widely used in various applications due to their excellent toughness and resistance to damage. The molecular weight distribution is a key measure for assessing resin degradation and estimating the mechanical strength of the final product. The analysis of PBT was performed using gel permeation chromatography (GPC) in the polar organic solvent 1,1,1,3,3,3-hexafluoroisopropanol (HFIP). The article discusses the use of Agilent PL HFIPgel columns for the analysis at 40°C, with detection using differential refractive index and viscometry. GPC coupled with a molecular weight sensitive viscometer allows for the calculation of molecular weights based on hydrodynamic properties.
This document details the analysis of Polybutadiene Terephthalate (PBT) resins using Agilent PL HFIPgel columns and Gel Permeation Chromatography (GPC). The method utilizes 1,1,1,3,3,3-hexafluoroisopropanol (HFIP) modified with sodium trifluoroacetate as the eluent to dissolve the polymer and prevent aggregation. The analysis is performed at 40 °C using two Agilent PL HFIPgel columns coupled with a PL-GPC 220 integrated chromatograph equipped with differential refractive index and viscometry detectors.
| Eluent | HFIP + 20 mM NaTFA |
|---|---|
| Flow Rate | 1.0 mL/min |
| Injection Volume | 200 pL |
| Temperature | 40°C |
| Columns | 2 x Agilent PL HFIPgel, 300 x 7.5 mm |
| Detectors | RI, Viscometer |
The analysis uses 1,1,1,3,3,3-hexafluoroisopropanol (HFIP) modified by the addition of 20 mM sodium trifluoroacetate.
The analysis is carried out at a temperature of 40 °C.
The system uses a PL-GPC 220 integrated chromatograph with differential refractive index and viscometry detection.