6533b7d2fe1ef96bd125df50
RESEARCH PRODUCT
A New Calibration Method for the Accurate Determination of Ethylene Content in Ethylene-Propylene Copolymers by CRYSTEX-IR
L. RomeroM.c. García-alvarez-coqueA. OrtínJose Ramon Torres-lapasioBenjamin Monrabalsubject
Polypropylenechemistry.chemical_classificationMaterials sciencePolymers and PlasticsOrganic ChemistryDetectorAnalytical chemistryInfrared spectroscopyPolymerEthylene propylene rubberCondensed Matter PhysicsAbsorbancechemistry.chemical_compoundchemistryMaterials ChemistryCalibrationGravimetric analysisdescription
Summary: CRYSTEX is a fully automated instrument for the determination of Xylene Solubles in polypropylene and ethylene-propylene copolymers, providing an excellent correlation with gravimetric methods. The instrument can be equipped with a dual band infrared (IR) detector to quantify the ethylene weight percentage (C2%) in the amorphous fraction, and in the whole polymer sample. In this work, a new approach based on multiple linear regression (MLR) models is presented, which makes use of two independent IR absorbance signals acquired simultaneously by the detector. A compromise model to predict directly C2% is proposed, which balances good accuracy and reduced experimental effort. MLR models able to predict the total sample concentration were also developed. The results were successfully validated using copolymer standards in a wide chemical composition range.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-02-01 | Macromolecular Symposia |