Microstructure and mechanical properties of polyurethane/nylon/montmorillonite nanocomposite
Nanocomposite of polyurethane (PU), Nylon66 (nylon), and montmorillonite (MMT) was prepared by a twin screw extruder, and the dispersion of MMT and the mechanical properties of the nanocomposite were analyzed. Dimethyl hydrogenated tallow 2-ethylhexyl ammonium modified Cloisite 25A (C25A) and methyl tallow bis-2-hydroxyethyl ammonium modified Cloisite 30B (C30B) were used as MMT. XRD and TEM analysis indicated that the continuous melt mixing by a twin screw extruder was effective in MMT dispersion. C30B having hydroxyl group on its surface has better dispersion than C25A in the PU/nylon matrix. Maximum stress and strain at break were the maximum at 1 wt% MMT regardless of matrix composition, and decreased at higher MMT content. Best MMT dispersion was also observed at 1 wt% MMT for the entire matrix composition. Aggregation of MMT occurred at MMT content higher than 1 wt%. Nylon addition also induced the aggregation of MMT because of the high polarity of nylon surface. Dispersion of MMT was very important in improving the mechanical properties of PU/nylon nanocomposite.
KeywordsNanocomposite Polyurethane Nylon Montmorillonite Mechanical property
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- 4.J. W. Gilman and T. Kashiwagi,SAMPE J.,33, 40 (1997).Google Scholar
- 7.A. Okada, M. Kawasumi, T. Kurauchi, and O. Kamigaito,Polym. Prepr.,28, 447 (1987).Google Scholar
- 8.A. Akelah and A. Moet,J. Mater. Sci.,31, 3589 (1996).Google Scholar
- 13.H. J. Fabris, “Advances in Urethane Science and Technology”, Technomic Publishing Co., New York, 1976.Google Scholar
- 19.Y. U. An, J. H. Chang, Y. H. Park, and J. M. Park,Polymer (Korea),26, 381 (2002).Google Scholar