Etude par chromatographie liquide haute pression de polyoléfines et de polyéthylènes modifiés

The high speed liquid chromatography behaviour of polyolefins with different crystallinities, of various branched chain polyolefins (high and low density polyethylene, ethylene-propylene copolymer, polypentene) as well as modified polyethylenes either in bulk (chlorination) or on the surface (chlorination, chlorophosphorylation, oxidation) was studied. The samples consisted of glass beads (44–50 μm) which were coated by deposition of the polymers. The study was carried out on one hand in an apolar mobile phase (cyclohexane) with phenol, ortho-, meta-, and para-nitrophenol as solutes, on the other hand in a polar mobile phase (water-methanol mixtures) with benzene, chlorobenzene, and orthodichlorobenzene as solutes. The influence of a swelling agent for the polymer and the temperature effect were investigated. The obtained results show the possibility of liquid chromatography to study interactions between polymers and a given solventsolute.