High-temperature gradient HPLC for the separation of polyethylene–polypropylene blends
2005; Elsevier BV; Volume: 46; Issue: 26 Linguagem: Inglês
10.1016/j.polymer.2005.11.001
ISSN1873-2291
AutoresLars‐Christian Heinz, Harald Pasch,
Tópico(s)Analytical chemistry methods development
ResumoA high-temperature gradient HPLC method has been developed for the analysis of polyethylene–polypropylene blends. For the first time it was possible to separate these polyolefin blends by a chromatographic technique which is operating at 140 °C. Blends of a commercial polypropylene and a medium molar mass linear polyethylene were separated using a mobile phase of ethylene glycol monobutylether (EGMBE) and 1,2,4-trichlorobenzene (TCB) and silica gel as the stationary phase. With the use of n-decanol as sample solvent, a precipitation–redissolution mechanism for polyethylene (PE) was established while polypropylene (PP) is eluted in size exclusion mode.
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