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Thermally induced dissolution/precipitation - A simple approach for the preparation of macroporous monoliths from linear aliphatic polyamides

Citation

Nguyen, AM and Nordborg, AMM and Shchukarev, A and Irgum, K, Thermally induced dissolution/precipitation - A simple approach for the preparation of macroporous monoliths from linear aliphatic polyamides, Journal of Separation Science, 32, (15-16) pp. 2619-2628. ISSN 1615-9306 (2009) [Refereed Article]


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The definitive published version is available online at: http://interscience.wiley.com

Official URL: http://interscience.wiley.com

DOI: doi:10.1002/jssc.200900241

Abstract

A versatile way of preparing macroporous monolithic materials from linear aliphatic polyamides is presented. Simply, polyamide pellets were treated in benzyl alcohol (BA) at elevated temperature, causing dissolution by interchain hydrogen bond disruption. Subsequent cooling below the upper critical solution temperature (UCST) resulted in precipitation and partial restoration of the semicrystalline polymer, which is organized into network structures. The final steps were a solvent exchange of BA for methanol, followed by drying to form monolithic entities. A number of polyamides ranging from hydrophilic to hydrophobic were tested and under the experimental conditions, poly(1-aza-2-cycloheptanone (PA6) and (poly-[imino-1,6-hexanediylimino{1,10-dioxo-1,10-decanediyl}] (PA610) yielded entities with macroporous properties that were deemed useful for liquid chromatography. The morphological features and porous properties of the monoliths produced by this dissolution-precipitation procedure were studied by scanning electron microscopy, adsorption/desorption of N2(g) according to the Brunauer-Emmett-Teller (BET) principle, and mercury intrusion porosimetry. Degradation of the polymer backbone was noticeable when the dissolution time was extended and shortening of the polymer chains was confirmed by MALDI-MS, viscosity measurements, X-ray photoelectron spectroscopy (XPS), and potentiometric titration. When the heating was limited to the time it took to dissolve the polymers, mechanically stable monoliths could be obtained. The dissolution/heat treatment time further seemed to be useful for controlling the macroporous morphology.

Item Details

Item Type:Refereed Article
Keywords:Dissolution • Non-acidic solvent • Nylon • Polyamides • Polymer degradation • Porous monoliths • Precipitation • Upper critical solution temperature (UCST)
Research Division:Chemical Sciences
Research Group:Analytical Chemistry
Research Field:Separation Science
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Chemical Sciences
Author:Nordborg, AMM (Dr Anna Nordborg)
ID Code:57722
Year Published:2009
Web of Science® Times Cited:11
Deposited By:Austn Centre for Research in Separation Science
Deposited On:2009-08-10
Last Modified:2010-04-08
Downloads:0

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