The analysis of the amorphous fraction is a fundamental task in the production of polypropylene.
It provides a measurement of the small amounts of undesirable low tacticity and low molar mass
fractions in homopolymer resins, which have significant influence on the polymer properties and
processing. Polymer Char instruments offer automated soluble fraction analysis in polypropylene
using Crystallization Analysis Fractionation (CRYSTAF) and Temperature Rising Elution Fractionation
(TREF) separation mechanisms
CRYSTEX® QC and CRYSTEX® 42 are analytical instruments designed to measure the Soluble Fraction
percentage in a fully automated way. CRYSTEX® QC is based on the Temperature Rising Elution Fractionation
(TREF) technique, performed in a two-step cycle to separate the soluble fraction from the crystalline
matrix and analyze them independently. CRYSTEX® 42 is also designed to measure the Soluble Fraction
percentage in a fully automated way with high throughput incorporating a high-temperature autosampler
with 42 positions.
The CRYSTEX® method is an automated method for determining the xylene-soluble matter in polypropylene
that is equivalent to the manual gravimetric method. It is included in the ISO 16152:2022 standard,
which is equivalent to the ASTM D5492 and ISO 6427, Annex B standards.