Abstract
Micrometer-sized particles and fibers of nylon 6/6 were produced by the means of precipitation with a compressed antisolvent (PCA). Specifically, nylon 6/6 micron-sized particles were produced by expanding a nylon/formic acid solution through various capillary nozzles into compressed carbon dioxide antisolvent. The effect of various operating parameters, such as the nylon/formic acid solution concentration, nozzle length and diameter, and nylon solution injection velocity, were examined, and no significant effect of varying operating conditions in the mean particle size, and particle size distribution was observed. In almost all of the cases, spherical particles were obtained. However, under certain circumstances, oblong particles (short fibers), fibers, and thin film morphologies were observed by manipulating various process parameters, including nylon solution concentration and the manner of spraying the solvent/nylon solution into the carbon dioxide antisolvent. The lack of significant influence of the varying operating conditions on the mean size may be explained in that the surface tensions of the sprayed droplets diminish at very short distances from the nozzle outlet as compared to the jet breakup length. In other words, the disappearance of surface tension stimulates gaslike mixing, without the formations of discrete droplets.
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