CRYSTAF-TREF0 pages

CRYSTAF-TREF
CRYSTAF AND TREF TECHNIQUES IN ONE INSTRUMENT

CRYSTAF and TREF techniques in the same
hardware to obtain complete CCD information.
CRYSTAF and TREF techniques are intended to measure the
Chemical Composition Distribution in Polyolefins: CRYSTAF
analyzes it in a crystallization cycle, and TREF in a dissolution
cycle.
The analysis of complex PP-PE combinations has been shown
to require TREF and CRYSTAF to unequivocally characterize
unknown samples due to differences in undercooling. Such a
case is the analysis of samples containing both HDPE and
Ethylene-Propylene copolymer (EP) for instance. In TREF, the
two components are not well resolved but CRYSTAF is capable
of getting a very good separation. An opposite case is the
analysis of samples containing both HDPE and Ziegler type PP
homopolymer, which are better separated with TREF than with
CRYSTAF.
Thus, the CRYSTAF-TREF instrument is a very convenient option
to analyze the CCD in Polyolefins, since either CRYSTAF or TREF
techniques can be performed just by changing the configuration
of the equipment.

KEY POINTS
Possibility of running CRYSTAF or TREF techniques in the same instrument.
Full automation of the CRYSTAF and TREF techniques to measure the CCD:
No manpower required.
No handling of solvent.
Low consumption of solvent.
Automatic cleaning at the end of the analysis.
5 samples can be analyzed with no supervision required; done sequentially
in TREF mode with an analysis time of 6 hours/sample, and simultaneously
in CRYSTAF mode with a total analysis time of 8 hours.
Possibility of subambient operation (down to -20ºC) for low crystallinity
samples.

Additional information about comonomer content can be
obtained if a composition sensor is incorporated into the IR4
detector, or about Molar Mass tendency by adding a
Viscometer detector (only in TREF mode).
The virtual instrumentation software controls the full process
either by CRYSTAF or by TREF, so no manpower is required.
Samples are put into the vessels and the instrument performs
the whole process including a final automatic cleaning.
Find out more at www.polymerchar.com/CRYSTAF-TREF
Possibility of running CRYSTAF or TREF techniques in the same instrument.

Polymer Characterization, S.A.

Gustave Eiffel, 8 Paterna
E-46980 Valencia, Spain

T.: +34 96 131 81 20
F.: +34 96 131 81 22

info@polymerchar.com
www.polymerchar.com