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Characterisation of blends of polyisoprene and polystyrene by on‐line hyphenation of HPLC and 1 H‐NMR: LC‐CC‐NMR at critical conditions of both homopolymers
Author(s) -
Sinha Pritish,
Hiller Wolf,
Pasch Harald
Publication year - 2010
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.201000486
Subject(s) - polystyrene , isoprene , analytical chemistry (journal) , chemistry , molar mass , proton nmr , size exclusion chromatography , chromatography , high performance liquid chromatography , materials science , copolymer , organic chemistry , polymer , enzyme
Blends of polystyrene (PS) and polyisoprene (PI) were analysed by on‐line hyphenation of LC at critical conditions and 1 H‐NMR. Chromatography at critical conditions was established for both PS and PI. At both critical conditions, a perfect separation into the blend components was achieved. By operating at critical conditions of one blend component and size exclusion mode for the other it is possible to determine the molar mass using a suitable calibration. By using NMR as a detector, the microstructure of PI can be identified, quantified and the chemical composition of the blends can be calculated by monitoring the signal intensities of the olefinic protons of isoprene and the aromatic protons of PS.