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Characterisation of blends of polyisoprene and polystyrene by on-line hyphenation of HPLC and 1H-NMR: LC-CC-NMR at critical conditions of both homopolymers

✍ Scribed by Pritish Sinha; Wolf Hiller; Harald Pasch

Publisher: John Wiley and Sons
Year: 2010
Tongue: English
Weight: 229 KB
Volume: 33
Category: Article
ISSN: 1615-9306
DOI: 10.1002/jssc.201000486

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✦ Synopsis

Abstract

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.

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On-Line HPLC-NMR of PS-b-PMMA and Blends

On-Line HPLC-NMR of PS-b-PMMA and Blends of PS and PMMA: LCCC-NMR at Critical Conditions of PS

✍ Wolf Hiller; Pritish Sinha; Harald Pasch 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 English ⚖ 506 KB

## Abstract Blends and copolymers of PS and PMMA were analysed by LC coupled to ^1^H NMR at the critical point of adsorption. The separation of the polymers was achieved at chromatographic conditions that correspond to the critical point of PS and the size‐exclusion mode of PMMA. Copolymers and ble