New Separation Technique for Chemical Composition Distribution Analysis in Polyolefins
- High-Temperature Liquid Chromatography (HT-LC) -

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Summary

HT-LC is a state-of-the-art technique in the field of the chromatographic separation of polyolefins. HT-LC clarifies the chemical composition distribution (CCD) of complex polyolefins. HT-LC can separate copolymers, according to ethylene content, more widely and more accurately than TREF, which is old-fashioned technique. Moreover, HT-LC saves analysis time by 80%, as compared with TREF.

Separation Mechanism (Interaction Chromatography)

The separation of HT-LC is based on the difference of the degree of the interaction between polymers and adsorbents. The closely they contact, the stronger the interaction becomes.

Application (Polyolefin Blend)

Advantages & Disadvantages (Comparison with Techniques for CCD Analysis)

Technique Separation Detection Analysis time
Key property Ethylene content
range / mol%
HT-LC Molecular interaction ○ 0-13, 45-100 ○ Online-IR ◎ 3 h
TREF
Temperature rising elution fractionation
Crystallinity
(Co-crystallization disturbs separation)
△ 0-13, 81-100 △ 24 h
Fractionation by decane Solubility × into 2 fractions
(Crystalline & amorphous)
◎ NMR △ 15 h

◎:Excellent, ○:Good, △:Fair, ×:Poor

Search Number 1047

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