Presented at the 4th International Conference on Polyolefin Characterization (ICPC), 2012. The Woodlands, TX, USA.
Benjamín Monrabal, Pilar del Hierro, Alfredo Roig. Polymer Char, Valencia, Spain.
Gel Permeation Chromatography (GPC) – or Size Exclusion Chromatography (SEC) – analysis of polyolefins needs to be performed at high temperature to dissolve the polymer in chlorinated solvents such as 1,2,4-trichlorobenzene or 1,2-dichlorobenzene; this results in a demanding job in both sample preparation and analysis. Besides, sample dissolution has to be performed with care to minimize polymer degradation.
Sample degradation has always been a concern in GPC/SEC analysis of polyolefins due to:
In this paper, the polymer degradation of various polyolefins in the dissolution step is investigated. The degradation level is monitored by the full Molecular Weight Distribution (MWD) displacement and by the molecular weight average (Mw).