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Delamination of Organo-Modified Layered Double Hydroxides in Polyamide 6 by Melt Processing



Mauro Zammarano, S Bellayer, Jeffrey W. Gilman, Massimiliano Franceschi, Frederick Beyer, Richard H. Harris Jr., Meriani Sergio


Layered double hydroxide/polyamide 6 nanocomposites (LDH/PA6) were prepared from organo-modified LDH by melt processing. The anionic exchange capacity of LDH was varied in order to investigate its influence on the degree of exfoliation. LDH were dispersed by a twin screw micro-extruder at a variety of processing conditions. The nanocomposites were characterized by wide-angle (WAXS) and small-angle (SAXS) X-ray scattering, transmission electron microscopy, dynamic scanning calorimetry, and thermogravimetric analysis. It was found that exfoliated nanocomposites were successfully prepared by melt processing with a low exchange capacity LDH, whereas residue tactoids were observed with a high exchange capacity LDH. Shear seems to be the key to delamination in LDH/PA6. No major change in the crystalline phase or in the rate of crystallization was observed in the LDH nanocomposites. A reduction of thermal stability in PA-6/LDH compared to neat PA-6, due to a nucleophilic attack mechanism, was observed. The properties of these nanocomposites are discussed with connections to the current understanding within the broader nanocomposite field.
Polymer Journal


layered double hydroxides, nanocomposites, polyamide


Zammarano, M. , Bellayer, S. , Gilman, J. , Franceschi, M. , Beyer, F. , Harris Jr., R. and Sergio, M. (2017), Delamination of Organo-Modified Layered Double Hydroxides in Polyamide 6 by Melt Processing, Polymer Journal (Accessed April 16, 2024)
Created February 19, 2017