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High‐Temperature Solvent Gradient Liquid Chromatography of Model Long Chain Branched Polyethylenes
Author(s) -
Macko Tibor,
Brüll Robert,
SantonjaBlasco Laura,
Alamo Rufina G.
Publication year - 2015
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201500046
Subject(s) - molar mass , polyethylene , solvent , polymerization , adsorption , polymer chemistry , porosity , copolymer , chemistry , linear low density polyethylene , chromatography , gel permeation chromatography , materials science , organic chemistry , polymer
Summary The high‐temperature solvent gradient liquid chromatography system 1‐decanol/1,2,4‐trichlorobenzene/porous graphite Hypercarb TM has been applied to the separation of well‐defined model long chain branched (LCB) polyethylenes with different architectures (star, H‐type, super H‐type, pompom, comb). The model LCB polyethylenes have been prepared by anionic polymerization of butadiene followed by click chemistry. After hydrogenation of the polybutadienes, the LCB samples contain ∼ 2 mol % ethyl branches randomly distributed along the backbone and the LCB, as is typical for linear low density polyethylene (LLDPE). The results indicate that the LCB does not influence the chromatographic separation substantially. The adsorption characteristics of the LCB copolymers are dominated by the SCB content. The presence of LCB increases the molar mass of the samples; however, the increase in molar mass from 100 kg/mol to 200 kg/mol does not influence chromatographic separations in the applied system of porous carbon and 1‐decanol/1,2,4‐trichlorobenzene.