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Flow Injection Polymer Analysis (FIPA) of EPDM Elastomers
Ethylene-Propylene-Diene-Monomer (EPDM) Elastomers are random amorphous polymers with outstanding properties and broad applications. These materials are commonly found in automotive parts, single-ply roofing membranes, motor oil formulations, etc. Historically, Molecular Weight Distribution (MWD) characterization of EPDM has been carried out using high-temperature GPC. Common run conditions involve the use of trichlorobenzene as the solvent and 140 C temperature. The FIPA method described below provides an alternative chromatographic method that is much more user friendly.
FIPA Run Conditions
Detector: Model 302 TDA
Solvent: THF
Column: ViscoGEL FIPA-100H (10 cmX7.8mm id)
Temperature: 60 C
Concentration: Approximately 0.2%
Injection Volume: 100 μL
Flow Rate: 1.0 mL/min
In this application, the EPDM Samples are first dissolved in hot (60 to 80 C) cyclohexane. Please note that most EPDM samples are not soluble in THF, even up to the boiling point of THF. However, we were able to directly inject samples dissolved in cyclohexane into a 60 C THF FIPA system and obtained excellent molecular results.
Please note that the FIPA-100H (100 angstrom) column is doing a very good job separating the polymer peak from the cyclohexane solvent peak (in about 4 minutes). However, there is little or no resolution of the polymer distribution. Therefore, FIPA can only provide MW and IV averages (i.e., no distribution information).
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VISCOTEK Corporation
15600 West Hardy Road
Houston, TX, 77060
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