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Thermally induced dissolution/precipitation – A simple approach for the preparation of macroporous monoliths from linear aliphatic polyamides
Author(s) -
Nguyen Anh Mai,
Nordborg Anna,
Shchukarev Andrei,
Irgum Knut
Publication year - 2009
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.200900241
Subject(s) - dissolution , polymer , chemical engineering , polyamide , dimethylacetamide , desorption , materials science , potentiometric titration , precipitation , solvent , polymer chemistry , adsorption , chemistry , organic chemistry , ion , physics , meteorology , engineering
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 N 2 (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.