Temperature Rising Elution Fractionation and Crystallization Analysis Fractionation
Polymers and Rubbers
Published Online: 15 SEP 2006
Copyright © 2000 John Wiley & Sons, Ltd. All rights reserved.
Encyclopedia of Analytical Chemistry
How to Cite
Monrabal, B. 2006. Temperature Rising Elution Fractionation and Crystallization Analysis Fractionation. Encyclopedia of Analytical Chemistry. .
- Published Online: 15 SEP 2006
Temperature rising elution fractionation (TREF) and crystallization analysis fractionation (CRYSTAF) are separation techniques for the characterization of semicrystalline polymers in terms of chemical composition. TREF has become a powerful tool for preparative polymer fractionation and for the analysis of the chemical composition distribution (CCD) in polyolefins. CRYSTAF, a more recent technique and with a simple hardware design, provides a faster approach for the analysis of the CCD. Both TREF and CRYSTAF separate according to the crystallizability of the polymer molecules, which is influenced by tacticity or the comonomer incorporation into the chain. TREF and CRYSTAF are becoming specially relevant in the characterization of the new and complex polyolefins made with combinations of homogeneous and heterogeneous catalysts.